Subsequent Events - Additional Information (Detail) - JPY (¥) ¥ in Billions		12 Months Ended
	Apr. 27, 2026	Mar. 31, 2026
Subsequent Event [Member]
Subsequent Event [Line Items]
Gain (Loss) on Disposition of Stock in Subsidiary	¥ 124.2
Common Stock
Subsequent Event [Line Items]
Stock Repurchased During Period, Shares		100,000,000
Stock Repurchased During Period, Percentage		9.10%
Stock Repurchased During Period, Value		¥ 250.0
Stock Repurchase Program Period Description		May 22, 2026 to March 31, 2027

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

- Definition

Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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