Quarterly Consolidated 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 consolidated statement of cash flows | ||||||
| Statement of cash flows | ||||||
| Cash flows from operating activities | ||||||
| Profit (loss) before income taxes | — | 
                                                -34,689,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                327,192,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Depreciation | — | 
                                                131,509,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                155,063,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Increase (decrease) in allowance for doubtful accounts | — | 
                                                8,352,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -375,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Interest expenses | — | 
                                                4,121,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                5,255,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Decrease (increase) in trade receivables | — | 
                                                127,233,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                151,778,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Decrease (increase) in inventories | — | 
                                                -182,297,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                5,856,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Increase (decrease) in trade payables | — | 
                                                -113,768,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -318,482,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Other, net | — | 
                                                -47,624,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,777,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Subtotal | — | 
                                                -279,740,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                327,893,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Interest paid | — | 
                                                -4,064,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -4,965,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Income taxes paid | — | 
                                                -141,988,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -182,046,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) operating activities | — | 
                                                -410,151,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                141,683,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash flows from investing activities | ||||||
| Purchase of property, plant and equipment | — | 
                                                -90,356,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -63,808,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Proceeds from sale of property, plant and equipment | — | 
                                                27,353,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                37,567,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Purchase of investment securities | — | 
                                                -235,041,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Proceeds from sale of investment securities | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                236,354,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Loan advances | — | 
                                                -20,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Other, net | — | 
                                                -4,447,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                229,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) investing activities | — | 
                                                -364,898,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                187,458,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash flows from financing activities | ||||||
| Repayments of long-term borrowings | — | 
                                                -318,564,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -298,104,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Purchase of treasury shares | — | 
                                                -83,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Dividends paid | — | 
                                                -145,245,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -291,753,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) financing activities | — | 
                                                -463,893,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -589,857,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Effect of exchange rate change on cash and cash equivalents | — | 
                                                0
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                2,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net increase (decrease) in cash and cash equivalents | — | 
                                                -1,238,943,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -260,714,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash and cash equivalents | 
                                                6,242,807,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                7,481,750,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,892,030,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                7,152,744,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |