Statement Of Cash Flows
| Concept | As at 2025-03-31 | 2024-04-01 to 2025-03-31 | 2023-04-01 to 2024-03-31 | As at 2024-03-31 | As at 2023-03-31 | 
|---|---|---|---|---|---|
| Statement of cash flows | |||||
| Statement of cash flows | |||||
| Cash flows from operating activities | |||||
| Subtotal | — | 
                                                2,506,863,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,389,925,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Interest and dividends received | — | 
                                                15,880,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,288,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Interest paid | — | 
                                                -50,720,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -36,205,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) operating activities | — | 
                                                1,523,120,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,621,942,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from operating activities | |||||
| Cash flows from operating activities | |||||
| Cash flows from facilities maintenance and investing activities | |||||
| Purchase of property, plant and equipment | — | 
                                                -964,701,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -728,602,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Purchase of investment securities | — | 
                                                -10,300,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -292,562,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Loan advances | — | 
                                                -43,113,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -29,446,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Proceeds from collection of loans receivable | — | 
                                                55,181,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                98,989,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Other, net | — | 
                                                -26,843,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -18,296,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from investing activities | |||||
| Net cash provided by (used in) investing activities | — | 
                                                -1,378,046,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,233,804,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from financing activities | |||||
| Purchase of treasury shares | — | 
                                                -60,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -482,063,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Dividends paid | — | 
                                                -648,625,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -293,705,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Proceeds from long-term borrowings | — | 
                                                3,000,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,000,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Repayments of long-term borrowings | — | 
                                                -3,815,413,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -3,650,232,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) financing activities | — | 
                                                -1,464,098,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,426,001,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Effect of exchange rate change on cash and cash equivalents | — | 
                                                7,594,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                16,611,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net increase (decrease) in cash and cash equivalents | — | 
                                                -1,311,430,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,978,748,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash and cash equivalents | 
                                                27,836,939,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                29,148,369,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                27,169,621,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |