Consolidated Statement Of Income
| Concept | 2021-04-01 to 2022-03-31 | 2021-04-01 to 2022-03-31 | 2021-04-01 to 2022-03-31 | 2021-04-01 to 2022-03-31 | 2021-04-01 to 2022-03-31 | 2021-04-01 to 2022-03-31 | 2021-04-01 to 2022-03-31 | 2021-04-01 to 2022-03-31 | 2021-04-01 to 2022-03-31 | 2021-04-01 to 2022-03-31 | 2021-04-01 to 2022-03-31 | 2020-04-01 to 2021-03-31 | 2020-04-01 to 2021-03-31 | 2020-04-01 to 2021-03-31 | 2020-04-01 to 2021-03-31 | 2020-04-01 to 2021-03-31 | 2020-04-01 to 2021-03-31 | 2020-04-01 to 2021-03-31 | 2020-04-01 to 2021-03-31 | 2020-04-01 to 2021-03-31 | 2020-04-01 to 2021-03-31 | 2020-04-01 to 2021-03-31 | 2020-04-01 to 2021-03-31 | 
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Consolidated statement of income | |||||||||||||||||||||||
| Statement of income | |||||||||||||||||||||||
| Net sales | 
                                                11,084,919,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                689,847,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,395,072,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                9,813,575,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                11,084,919,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                11,061,965,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                967,477,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                9,583,546,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                11,199,220,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                11,199,220,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                11,122,609,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                10,231,743,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Cost of sales | — | — | — | — | — | — | 
                                                7,039,823,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                7,863,600,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                6,674,536,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                7,683,333,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Operating expenses | |||||||||||||||||||||||
| Operating expenses - general | |||||||||||||||||||||||
| Depreciation | — | — | — | — | — | — | 
                                                66,973,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                74,343,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                73,199,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                79,270,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Operating expenses | |||||||||||||||||||||||
| Selling, general and administrative expenses | — | — | — | — | — | — | 
                                                2,390,643,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                2,777,061,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                2,412,819,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                2,794,329,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Provision of allowance for doubtful accounts | — | — | — | — | — | — | 
                                                26,375,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                48,443,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                -3,629,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                -3,678,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Other | — | — | — | — | — | — | — | — | 
                                                1,012,478,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | 
                                                999,574,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Operating expenses | |||||||||||||||||||||||
| Other operating expenses | |||||||||||||||||||||||
| Provision for retirement benefits for directors (and other officers) | — | — | — | — | — | — | 
                                                8,413,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                11,531,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                7,711,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                10,384,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Operating expenses | |||||||||||||||||||||||
| Net sales | |||||||||||||||||||||||
| Net sales of completed construction contracts | — | — | — | — | — | — | 
                                                120,195,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | 
                                                105,742,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | 
| Ordinary profit (loss) | — | — | — | — | — | — | 
                                                430,968,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                447,583,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                505,905,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                633,830,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Operating profit (loss) | 
                                                802,448,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                20,599,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                781,848,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                383,109,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                802,448,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                421,303,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                111,318,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                496,191,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,028,332,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,028,332,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                644,946,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                917,013,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Gross profit (loss) | — | — | — | — | — | — | 
                                                2,773,752,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                3,198,365,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                2,909,010,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                3,439,275,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| General and administrative expenses | |||||||||||||||||||||||
| Operating expenses | |||||||||||||||||||||||
| Research and development expenses | — | — | — | — | — | — | — | — | 
                                                191,862,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | 
                                                194,928,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cost of sales | |||||||||||||||||||||||
| Selling, general and administrative expenses | |||||||||||||||||||||||
| Non-operating income | |||||||||||||||||||||||
| Interest income | — | — | — | — | — | — | 
                                                359,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                9,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                505,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                16,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Dividend income | — | — | — | — | — | — | 
                                                10,691,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                11,437,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                12,349,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                13,096,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Other | — | — | — | — | — | — | — | — | 
                                                9,980,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | 
                                                7,090,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Non-operating income | — | — | — | — | — | — | 
                                                50,335,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                28,755,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                45,844,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                25,015,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Miscellaneous income | — | — | — | — | — | — | 
                                                13,608,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | 
                                                9,855,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | 
| Extraordinary income | — | — | — | — | — | — | 
                                                112,717,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                123,165,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                299,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                300,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Non-operating expenses | |||||||||||||||||||||||
| Interest expenses | — | — | — | — | — | — | 
                                                2,475,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                2,475,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                3,451,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                3,451,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Other | — | — | — | — | — | — | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | 
                                                0
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Non-operating expenses | — | — | — | — | — | — | 
                                                2,475,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                2,475,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                36,130,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                36,130,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Extraordinary losses | — | — | — | — | — | — | 
                                                1,845,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,845,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                30,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                41,860,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Impairment losses | — | — | — | — | — | — | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                41,829,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                41,829,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                41,829,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Gross profit | |||||||||||||||||||||||
| Profit (loss) before income taxes | — | — | — | — | — | — | 
                                                541,840,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                568,903,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                506,174,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                592,270,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Extraordinary income | |||||||||||||||||||||||
| Gain on sale of non-current assets | — | — | — | — | — | — | 
                                                3,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                3,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                299,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                300,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Gain on sale of investment securities | — | — | — | — | — | — | 
                                                112,714,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                123,161,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Income taxes - current | — | — | — | — | — | — | 
                                                68,972,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                130,724,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                113,105,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                174,897,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Income taxes - deferred | — | — | — | — | — | — | 
                                                103,603,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                59,691,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                46,212,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                37,868,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Extraordinary losses | |||||||||||||||||||||||
| Loss on retirement of non-current assets | — | — | — | — | — | — | 
                                                1,845,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,845,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                30,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                30,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Income taxes | — | — | — | — | — | — | 
                                                172,575,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                190,415,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                159,318,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                212,766,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Profit (loss) | — | — | — | 
                                                369,265,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                369,265,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                369,265,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                378,487,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                369,265,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                346,855,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                346,855,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                346,855,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                346,855,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                379,504,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Profit (loss) attributable to non-controlling interests | — | — | — | — | — | — | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Profit (loss) attributable to owners of parent | — | — | — | — | 
                                                378,487,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                378,487,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                378,487,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                379,504,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                379,504,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                379,504,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Other comprehensive income | |||||||||||||||||||||||
| Valuation difference on available-for-sale securities | — | — | — | — | — | — | — | — | 
                                                -86,552,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | 
                                                95,704,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Remeasurements of defined benefit plans, net of tax | — | — | — | — | — | — | — | — | 
                                                2,230,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | 
                                                3,040,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Other comprehensive income | — | — | — | — | — | — | — | — | 
                                                -84,322,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | 
                                                98,744,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Profit attributable to | |||||||||||||||||||||||
| Comprehensive income | — | — | — | — | — | — | — | — | 
                                                294,165,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | 
                                                478,249,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Comprehensive income attributable to | |||||||||||||||||||||||
| Comprehensive income attributable to owners of parent | — | — | — | — | — | — | — | — | 
                                                294,165,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | 
                                                478,249,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Comprehensive income attributable to non-controlling interests | — | — | — | — | — | — | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — |