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Subsequent Events - Additional Information (Detail) - Common Stock ¥ in Billions | 12 Months Ended
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Mar. 31, 2024 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 | ¥ | ¥ 50
Stock Repurchase Program Period Description | May 15, 2024 to March 31, 2025

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