Quarterly Consolidated Statement Of Cash Flows
| Concept | 2024-04-01 to 2025-03-31 | As at 2025-03-31 | 2024-04-01 to 2025-03-31 | 2023-04-01 to 2024-03-31 | As at 2024-03-31 | 2023-04-01 to 2024-03-31 | As at 2023-03-31 | 
|---|---|---|---|---|---|---|---|
| Quarterly consolidated statement of cash flows | |||||||
| Statement of cash flows | |||||||
| Cash flows from operating activities | |||||||
| Profit (loss) before income taxes | 
                                                61,831,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                134,809,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                336,378,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                201,407,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Depreciation | — | — | 
                                                364,543,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                315,512,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Amortization of goodwill | — | — | 
                                                72,349,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                39,002,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Increase (decrease) in allowance for doubtful accounts | — | — | 
                                                -43,748,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                37,986,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Interest and dividend income | — | — | 
                                                -26,288,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -30,536,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Interest expenses | — | — | 
                                                25,482,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                12,952,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Share of loss (profit) of entities accounted for using equity method | — | — | 
                                                24,786,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                45,350,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Decrease (increase) in trade receivables | — | — | 
                                                1,133,245,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -479,831,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Decrease (increase) in inventories | — | — | 
                                                319,536,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                699,070,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Increase (decrease) in trade payables | — | — | 
                                                -713,074,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                307,248,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Other, net | — | — | 
                                                43,696,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -243,949,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Subtotal | — | — | 
                                                834,670,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,385,871,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Interest and dividends received | — | — | 
                                                26,838,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                30,905,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Interest paid | — | — | 
                                                -26,513,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -12,929,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Income taxes paid | — | — | 
                                                -73,982,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -66,029,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Net cash provided by (used in) operating activities | — | — | 
                                                903,073,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,337,851,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Cash flows from investing activities | |||||||
| Purchase of property, plant and equipment | — | — | 
                                                -750,785,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -473,430,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Proceeds from sale of property, plant and equipment | — | — | 
                                                54,834,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,670,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Purchase of investment securities | — | — | 
                                                -5,608,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -4,196,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Proceeds from sale of investment securities | — | — | 
                                                49,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Purchase of shares of subsidiaries resulting in change in scope of consolidation | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -38,740,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Loan advances | — | — | 
                                                -139,374,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Proceeds from collection of loans receivable | — | — | 
                                                150,828,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Other, net | — | — | 
                                                -7,384,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -47,690,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Net cash provided by (used in) investing activities | — | — | 
                                                -121,015,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,955,439,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Cash flows from financing activities | |||||||
| Repayments of long-term borrowings | — | — | 
                                                -741,466,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -813,301,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Purchase of treasury shares | — | — | 
                                                -43,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -161,907,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Dividends paid | — | — | 
                                                -91,769,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -90,816,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Dividends paid to non-controlling interests | — | — | 
                                                -13,520,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -10,400,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Net cash provided by (used in) financing activities | — | — | 
                                                111,524,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                160,589,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Effect of exchange rate change on cash and cash equivalents | — | — | 
                                                65,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,906,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Net increase (decrease) in cash and cash equivalents | — | — | 
                                                893,647,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -455,091,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Cash and cash equivalents | — | 
                                                1,789,091,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                895,444,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,350,536,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |