Semi-Annual Consolidated Statement Of Cash Flows
| Concept | As at 2024-09-30 | 2024-04-01 to 2024-09-30 | As at 2024-03-31 | As at 2023-09-30 | 2023-04-01 to 2023-09-30 | As at 2023-03-31 | 
|---|---|---|---|---|---|---|
| Semi-annual consolidated statement of cash flows | ||||||
| Statement of cash flows | ||||||
| Cash flows from operating activities | ||||||
| Profit (loss) before income taxes | — | 
                                                185,548,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                234,583,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Depreciation | — | 
                                                212,344,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                208,656,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Amortization of goodwill | — | 
                                                10,895,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                5,105,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Increase (decrease) in allowance for doubtful accounts | — | 
                                                348,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -328,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Interest and dividend income | — | 
                                                -5,795,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -4,368,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Interest expenses | — | 
                                                5,789,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                3,158,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Increase (decrease) in retirement benefit liability | — | 
                                                12,719,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -7,838,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Increase (decrease) in provision for bonuses | — | 
                                                -25,258,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,151,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Decrease (increase) in trade receivables | — | 
                                                314,467,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                208,202,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Decrease (increase) in inventories | — | 
                                                161,222,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -67,464,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Increase (decrease) in trade payables | — | 
                                                77,030,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -70,361,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Other, net | — | 
                                                -16,853,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -37,870,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Subtotal | — | 
                                                683,687,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                540,320,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Interest and dividends received | — | 
                                                6,397,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                4,967,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Interest paid | — | 
                                                -5,882,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -3,155,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Income taxes paid | — | 
                                                -97,857,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -48,937,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) operating activities | — | 
                                                599,568,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                494,211,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash flows from investing activities | ||||||
| Purchase of property, plant and equipment | — | 
                                                -194,154,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -341,412,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Proceeds from sale of property, plant and equipment | — | 
                                                804,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,477,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Purchase of investment securities | — | 
                                                -2,618,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -2,057,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Purchase of shares of subsidiaries resulting in change in scope of consolidation | — | 
                                                -40,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -155,520,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Proceeds from collection of loans receivable | — | 
                                                109,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                107,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) investing activities | — | 
                                                -366,023,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -516,054,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash flows from financing activities | ||||||
| Proceeds from long-term borrowings | — | 
                                                300,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Repayments of long-term borrowings | — | 
                                                -90,487,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -184,526,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Purchase of treasury shares | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                0
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Dividends paid | — | 
                                                -134,152,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -134,812,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) financing activities | — | 
                                                -35,518,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                23,670,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Dividends paid to non-controlling interests | — | 
                                                -12,034,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -13,877,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Effect of exchange rate change on cash and cash equivalents | — | 
                                                24,713,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                31,488,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net increase (decrease) in cash and cash equivalents | — | 
                                                222,740,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                33,316,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash and cash equivalents | 
                                                3,134,428,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                2,911,687,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,125,497,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                2,092,180,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |