Quarterly 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 | 
|---|---|---|---|---|---|---|
| Quarterly statement of cash flows | ||||||
| Statement of cash flows | ||||||
| Cash flows from operating activities | ||||||
| Subtotal | — | 
                                                278,574,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -268,980,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Interest and dividends received | — | 
                                                1,041,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,110,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Interest paid | — | 
                                                -28,301,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -18,529,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Income taxes paid | — | 
                                                -134,874,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -124,811,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) operating activities | — | 
                                                116,439,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -411,210,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash flows from investing activities | ||||||
| Purchase of property, plant and equipment | — | 
                                                -246,923,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -215,246,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Proceeds from sale of property, plant and equipment | — | 
                                                144,951,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                67,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Proceeds from collection of loans receivable | — | 
                                                5,144,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                19,934,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Other, net | — | 
                                                -3,115,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -5,926,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) investing activities | — | 
                                                -347,599,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -199,260,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash flows from financing activities | ||||||
| Proceeds from long-term borrowings | — | 
                                                2,232,500,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,500,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Repayments of long-term borrowings | — | 
                                                -980,175,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -640,650,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Redemption of bonds | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -135,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Purchase of treasury shares | — | 
                                                -7,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -4,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Dividends paid | — | 
                                                -117,082,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -117,037,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) financing activities | — | 
                                                1,114,123,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                586,656,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Effect of exchange rate change on cash and cash equivalents | — | 
                                                -6,565,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                12,293,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net increase (decrease) in cash and cash equivalents | — | 
                                                876,397,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -11,522,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash and cash equivalents | 
                                                4,272,775,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                3,396,377,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,224,688,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                3,236,211,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |