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Income Taxes (Narrative) (Detail) - JPY (¥)
¥ in Millions
12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2024
Income Tax Disclosure [Abstract]      
Effect of changes in tax laws ¥ (12,876) ¥ 20,982  
Approximate effective statutory rate of corporate income tax   30.60% 30.60%
Undistributed earnings (losses) of foreign subsidiaries   ¥ 130,790  
Operating loss carryforwards 131,039    
Tax credit carryforwards ¥ 6,375