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v3.25.2

Subsequent Events - Additional Information (Detail) - Common Stock ¥ in Billions | 12 Months Ended
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Mar. 31, 2025 JPY (¥) shares
Subsequent Event [Line Items] |
Stock Repurchased During Period, Shares | shares | 40,000,000
Stock Repurchased During Period, Percentage | 3.50%
Stock Repurchased During Period, Value | ¥ | ¥ 100
Stock Repurchase Program Period Description | May 19, 2025 to March 31, 2026

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