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 | 
|---|---|---|---|---|---|---|---|
| Statement of cash flows | |||||||
| Statement of cash flows | |||||||
| Cash flows from operating activities | |||||||
| Profit (loss) before income taxes | 
                                                2,677,495,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                6,641,680,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,218,265,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,792,824,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Depreciation | — | — | 
                                                199,763,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                189,697,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Increase (decrease) in allowance for doubtful accounts | — | — | 
                                                -28,771,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                13,106,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Interest and dividend income | — | — | 
                                                -129,384,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -58,285,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Interest expenses | — | — | 
                                                15,988,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                13,030,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Decrease (increase) in trade receivables | — | — | 
                                                -1,070,809,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                678,805,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Decrease (increase) in inventories | — | — | 
                                                -86,752,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,215,345,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Increase (decrease) in trade payables | — | — | 
                                                649,443,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                79,157,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Subtotal | — | — | 
                                                6,424,048,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,413,172,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Other, net | — | — | 
                                                -292,553,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                329,528,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Income taxes paid | — | — | 
                                                -1,887,904,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,368,903,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Net cash provided by (used in) operating activities | — | — | 
                                                4,648,310,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,089,318,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Interest and dividends received | — | — | 
                                                129,384,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                58,285,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Interest paid | — | — | 
                                                -17,218,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -13,237,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Cash flows from operating activities | |||||||
| Cash flows from operating activities | |||||||
| Increase (decrease) in accounts payable - other | — | — | 
                                                50,589,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                96,659,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Cash flows from facilities maintenance and investing activities | |||||||
| Purchase of property, plant and equipment | — | — | 
                                                -303,109,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -144,790,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Purchase of investment securities | — | — | 
                                                -1,300,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -2,200,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Proceeds from sale of investment securities | — | — | 
                                                1,596,092,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                600,964,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Other, net | — | — | 
                                                -24,436,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -13,831,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Cash flows from investing activities | |||||||
| Net cash provided by (used in) investing activities | — | — | 
                                                3,003,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,787,883,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Cash flows from financing activities | |||||||
| Proceeds from issuance of shares | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                76,360,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Purchase of treasury shares | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -75,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Proceeds from long-term borrowings | — | — | 
                                                1,300,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,500,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Dividends paid | — | — | 
                                                -1,201,005,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -735,906,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Repayments of long-term borrowings | — | — | 
                                                -1,273,442,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -992,412,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Net cash provided by (used in) financing activities | — | — | 
                                                -1,274,447,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -52,034,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Net increase (decrease) in cash and cash equivalents | — | — | 
                                                3,376,866,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,249,400,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Cash and cash equivalents | — | 
                                                13,850,883,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                10,474,017,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                8,224,617,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |