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Redeemable Noncontrolling Interests (Changes in Redeemable Noncontrolling Interests) (Detail) - JPY (¥)
¥ in Millions
6 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Statement of Stockholders' Equity [Abstract]    
Beginning Balance ¥ 3,432 ¥ 2,645
Contribution to subsidiary 44,847 0
Transaction with noncontrolling interests 515 582
Adjustment of redeemable noncontrolling interests to redemption value 0 0
Comprehensive income (losses)    
Net Income 73 156
Other comprehensive income (losses)    
Net change of unrealized gains (losses) on investment in securities (6) (12)
Net change of foreign currency translation adjustments 402 (157)
Total other comprehensive income (losses) 396 (169)
Comprehensive income (losses) 469 (13)
Dividends (1,077) (708)
Ending Balance ¥ 48,186 ¥ 2,506