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Redeemable Noncontrolling Interests (Changes in Redeemable Noncontrolling Interests) (Detail) - JPY (¥)
¥ in Millions
3 Months Ended 6 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Statement of Stockholders' Equity [Abstract]        
Beginning Balance     ¥ 945 ¥ 0
Transaction with noncontrolling interests     834 865
Comprehensive income        
Net income     38 12
Other comprehensive income (losses)        
Net unrealized gains (losses) on investment in debt securities     (1) 0
Net change of foreign currency translation adjustments     163 88
Total other comprehensive income     162 88
Comprehensive income ¥ 88 ¥ 62 200 100
Dividends     (136) 0
Ending Balance ¥ 1,843 ¥ 965 ¥ 1,843 ¥ 965