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Derivative Financial Instruments and Hedging (Effect of Derivative Instruments on Consolidated Statements of Income, Pre-tax, Hedges of net investment in foreign operations) (Detail) - Hedges of net investment in foreign operations - Derivatives designated as hedging instruments - JPY (¥)
¥ in Millions
 6 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Borrowings and bonds in foreign currencies    
Derivative Instruments, Gain (Loss) [Line Items]    
Gains (losses) recognized in other comprehensive income on derivative and others ¥ 4,554 ¥ (12,854)
Foreign exchange contracts    
Derivative Instruments, Gain (Loss) [Line Items]    
Gains (losses) recognized in other comprehensive income on derivative and others 356 920
Gains on sales of subsidiaries and equity method investments and liquidation losses, net | Borrowings and bonds in foreign currencies    
Derivative Instruments, Gain (Loss) [Line Items]    
Gains (losses) reclassified from other comprehensive income (loss) into income 0 0
Gains on sales of subsidiaries and equity method investments and liquidation losses, net | Foreign exchange contracts    
Derivative Instruments, Gain (Loss) [Line Items]    
Gains (losses) reclassified from other comprehensive income (loss) into income 9,890 (790)
Interest expense | Borrowings and bonds in foreign currencies    
Derivative Instruments, Gain (Loss) [Line Items]    
Gains (losses) reclassified from other comprehensive income (loss) into income 0 0
Interest expense | Foreign exchange contracts    
Derivative Instruments, Gain (Loss) [Line Items]    
Gains (losses) reclassified from other comprehensive income (loss) into income ¥ 7,109 ¥ 7,635