v3.26.3
Acquisitions and Divestitures - Additional Information (Detail) - JPY (¥)
¥ in Millions
6 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Business Acquisition [Line Items]    
Gain on disposal of discontinued operation, before income tax ¥ 124,295 ¥ (3)
Japan & APAC    
Business Acquisition [Line Items]    
Gains (losses) on sales of subsidiaries and equity method investments and liquidation losses, net 62,894 9,148
Infrastructure    
Business Acquisition [Line Items]    
Gains (losses) on sales of subsidiaries and equity method investments and liquidation losses, net 2,637 88,740
USA & Europe    
Business Acquisition [Line Items]    
Gains (losses) on sales of subsidiaries and equity method investments and liquidation losses, net 3,233 312
Divestiture    
Business Acquisition [Line Items]    
Gains (losses) on sales of subsidiaries and equity method investments and liquidation losses, net ¥ 68,750 ¥ 98,200