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Redeemable Noncontrolling Interests (Changes in Redeemable Noncontrolling Interests) (Detail) - JPY (¥)
¥ in Millions
12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2021
Statement of Stockholders' Equity [Abstract]      
Beginning Balance ¥ 0 ¥ 0 ¥ 10,331
Transaction with noncontrolling interests 959 0 (10,028)
Adjustment of redeemable noncontrolling interests to redemption value 3 0 0
Comprehensive income (loss)      
Net Income (loss) 32 0 (23)
Other comprehensive income (loss)      
Net unrealized gains (losses) on investment in debt securities (24) 0 0
Net change of foreign currency translation adjustments (25) 0 (280)
Total other comprehensive income (loss) (49) 0 (280)
Comprehensive income (loss) (17) 0 (303)
Ending Balance ¥ 945 ¥ 0 ¥ 0