Quarterly Consolidated Balance Sheet
| Concept | As at 2023-12-31 | As at 2023-03-31 | 
|---|---|---|
| Quarterly consolidated balance sheet | ||
| Balance sheet | ||
| Assets | ||
| Current assets | ||
| Cash and deposits | 
                                                2,200,868,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,698,159,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Work in process | 
                                                935,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,739,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                169,346,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                226,226,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -2,777,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,300,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | 
                                                6,607,441,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,556,364,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | ||
| Property, plant and equipment | 
                                                311,681,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                13,584,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Property, plant and equipment | ||
| Intangible assets | ||
| Goodwill | 
                                                347,292,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                380,043,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                115,954,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                40,890,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | 
                                                463,246,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                420,934,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | 
                                                954,150,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                607,126,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | ||
| Other | 
                                                965,503,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                607,334,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -11,352,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -208,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | 
                                                1,729,079,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,041,644,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Assets | 
                                                8,336,521,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,598,008,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | ||
| Current liabilities | ||
| Short-term borrowings | 
                                                1,000,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                300,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Income taxes payable | 
                                                29,595,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                117,680,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                558,342,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                453,049,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | 
                                                3,988,687,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,828,548,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | ||
| Long-term borrowings | 
                                                1,715,215,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,566,939,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Asset retirement obligations | 
                                                145,383,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,060,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | 
                                                1,860,598,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,570,999,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | 
                                                5,849,286,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,399,547,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | ||
| Shareholders' equity | ||
| Share capital | 
                                                748,183,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                742,009,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Capital surplus | 
                                                736,683,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                730,509,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retained earnings | 
                                                1,002,323,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                725,920,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Treasury shares | 
                                                -103,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -103,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Shareholders' equity | 
                                                2,487,086,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,198,335,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Share acquisition rights | 
                                                148,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                126,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                2,487,235,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,198,461,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | 
                                                8,336,521,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,598,008,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |