Quarterly 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 | 
|---|---|---|---|---|---|
| Quarterly statement of cash flows | |||||
| Statement of cash flows | |||||
| Cash flows from operating activities | |||||
| Subtotal | — | 
                                                528,568,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                246,050,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Interest paid | — | 
                                                -26,616,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -18,460,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) operating activities | — | 
                                                46,813,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -3,827,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from investing activities | |||||
| Purchase of property, plant and equipment | — | 
                                                -2,564,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -3,833,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Proceeds from sale of property, plant and equipment | — | 
                                                112,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Other, net | — | 
                                                -2,117,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) investing activities | — | 
                                                -418,942,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                317,149,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from financing activities | |||||
| Proceeds from long-term borrowings | — | 
                                                596,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Repayments of long-term borrowings | — | 
                                                -188,626,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -172,008,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Redemption of bonds | — | 
                                                -11,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Proceeds from issuance of shares | — | 
                                                360,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,421,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Dividends paid | — | 
                                                -103,281,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -103,524,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Other, net | — | 
                                                23,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) financing activities | — | 
                                                226,952,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -330,211,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Effect of exchange rate change on cash and cash equivalents | — | 
                                                2,062,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                11,582,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net increase (decrease) in cash and cash equivalents | — | 
                                                -143,114,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -5,307,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash and cash equivalents | 
                                                3,606,612,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                3,749,726,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,755,033,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |