Consolidated 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 | 
|---|---|---|---|---|---|
| Consolidated statement of cash flows | |||||
| Statement of cash flows | |||||
| Cash flows from operating activities | |||||
| Subtotal | — | 
                                                59,102,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                61,629,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Interest and dividends received | — | 
                                                795,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                842,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Interest paid | — | 
                                                -3,155,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -2,257,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Income taxes paid | — | 
                                                -12,913,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -9,504,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Compensation paid for damage | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                640,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) operating activities | — | 
                                                44,722,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                51,214,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from investing activities | |||||
| Purchase of property, plant and equipment | — | 
                                                -52,868,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -48,703,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Proceeds from sale of property, plant and equipment | — | 
                                                12,486,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,309,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Purchase of investment securities | — | 
                                                -422,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -721,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) investing activities | — | 
                                                -58,024,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -62,492,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Purchase of shares of subsidiaries resulting in change in scope of consolidation | — | 
                                                -7,150,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -12,177,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Other, net | — | 
                                                -1,424,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                344,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from financing activities | |||||
| Purchase of treasury shares | — | 
                                                -406,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,383,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Proceeds from long-term borrowings | — | 
                                                28,158,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                50,674,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Proceeds from issuance of bonds | — | 
                                                19,897,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Dividends paid | — | 
                                                -6,549,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -5,608,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Dividends paid to non-controlling interests | — | 
                                                -683,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -440,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Repayments of long-term borrowings | — | 
                                                -15,004,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -14,859,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Purchase of shares of subsidiaries not resulting in change in scope of consolidation | — | 
                                                -2,531,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -23,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) financing activities | — | 
                                                454,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                33,157,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Other, net | — | 
                                                -157,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                66,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Effect of exchange rate change on cash and cash equivalents | — | 
                                                868,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,258,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net increase (decrease) in cash and cash equivalents | — | 
                                                -11,977,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                23,137,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash and cash equivalents | 
                                                67,306,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                79,284,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                56,147,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |