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Subsequent Events - Additional Information (Detail) - Common Stock
¥ in Billions
12 Months Ended
Mar. 31, 2023
JPY (¥)
shares
Subsequent Event [Line Items]  
Stock Repurchased During Period, Shares | shares 40,000,000
Stock Repurchased During Period, Percentage 3.40%
Stock Repurchased During Period, Value | ¥ ¥ 50
Stock Repurchase Program Period Description May 17, 2023 to March 31, 2024