Shareholdings
| Concept | As at 2024-03-31 | As at 2024-03-31 | As at 2023-03-31 | As at 2023-03-31 | 
|---|---|---|---|---|
| Shareholdings | ||||
| Reporting company | ||||
| Details of deemed holdings of shares held for purposes other than pure investment | ||||
| Issue | 
                                                神鋼商事㈱
                                                
                                             | 
                                                ㈱富士ピー・エス
                                                
                                             | — | — | 
| Number of shares | 
                                                80,300
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                722,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                80,300
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                722,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
| Carrying amount | 
                                                579,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                328,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                465,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                327,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Purpose of shareholding, overview of business alliance, quantitative effects of shareholding and reason for increase in number of shares | 
                                                主要顧客・商社として、取引の円滑化や情報収集
                                                
                                             | 
                                                PC鋼線事業における橋梁・建築分野向け PC関連製品に関する取引関係の維持・強化
                                                
                                             | — | — | 
| Whether issuer of aforementioned shares holds reporting company's shares | 
                                                有
                                                
                                             | 
                                                無
                                                
                                             | — | — |