v3.26.1
Redeemable Noncontrolling Interests (Changes in Redeemable Noncontrolling Interests) (Detail) - JPY (¥)
¥ in Millions
12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2024
Statement of Stockholders' Equity [Abstract]      
Beginning Balance ¥ 3,432 ¥ 2,645 ¥ 945
Contribution to subsidiary 45,708 0 0
Transaction with noncontrolling interests 2,108 1,963 2,122
Adjustment of redeemable noncontrolling interests to redemption value 0 0 0
Comprehensive income (loss)      
Net Income (loss) (758) 394 137
Other comprehensive income (loss)      
Net change of unrealized gains (losses) on investment in securities (12) 0 10
Net change of foreign currency translation adjustments 3,543 (50) 203
Total other comprehensive income (loss) 3,531 (50) 213
Comprehensive income (loss) 2,773 344 350
Dividends (3,278) (1,520) (772)
Ending Balance ¥ 50,743 ¥ 3,432 ¥ 2,645