Statement Of Cash Flows
| Concept | 2023-04-01 to 2024-03-31 | As at 2024-03-31 | As at 2023-03-31 | 2022-04-01 to 2023-03-31 | As at 2022-03-31 | 
|---|---|---|---|---|---|
| Statement of cash flows | |||||
| Statement of cash flows | |||||
| Cash flows from operating activities | |||||
| Subtotal | 
                                                2,035,052,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,949,719,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Interest and dividends received | 
                                                19,985,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                15,887,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Income taxes paid | 
                                                -364,746,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -210,991,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Interest paid | 
                                                -32,928,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -43,236,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) operating activities | 
                                                1,630,050,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,711,378,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash flows from operating activities | |||||
| Cash flows from operating activities | |||||
| Cash flows from facilities maintenance and investing activities | |||||
| Purchase of property, plant and equipment | 
                                                -161,733,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -242,510,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Proceeds from sale of property, plant and equipment | 
                                                2,650,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                9,363,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Proceeds from sale of investment securities | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                658,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Other, net | 
                                                1,507,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                38,871,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash flows from investing activities | |||||
| Net cash provided by (used in) investing activities | 
                                                -163,003,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -204,104,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash flows from financing activities | |||||
| Purchase of treasury shares | 
                                                -181,337,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -415,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Dividends paid | 
                                                -84,286,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -41,867,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Proceeds from long-term borrowings | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                100,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Repayments of long-term borrowings | 
                                                -538,372,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -571,963,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) financing activities | 
                                                -2,143,967,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -874,504,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Effect of exchange rate change on cash and cash equivalents | 
                                                217,307,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                184,158,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net increase (decrease) in cash and cash equivalents | 
                                                -459,612,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                816,928,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash and cash equivalents | — | 
                                                3,553,129,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,012,742,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                3,195,813,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |