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Subsequent Events - Additional Information (Detail) - Common Stock ¥ in Billions	12 Months Ended
	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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- Definition

Percentage of stock repurchased during to outstanding shares.

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Stock repurchase program period description.

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- Definition

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.

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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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Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

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