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Stock-Based Compensation - Additional Information (Detail) ¥ in Millions	12 Months Ended
	Mar. 31, 2025 JPY (¥) Point	Mar. 31, 2024 JPY (¥)	Mar. 31, 2023 JPY (¥)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Points settled for individuals retired	303,586
Points outstanding	3,028,648
Stock Compensation Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Points granted	599,916
Stock-based compensation costs recognized | ¥	¥ 1,778	¥ 2,177	¥ 937

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