Fair Value of Financial Assets and Liabilities - Summary of Aggregate Deferred Day One Profit (Detail) - JPY (¥) ¥ in Millions |
12 Months Ended | |
|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
|
| Disclosure of detailed information about financial instruments [abstract] | ||
| Balance at beginning of period | ¥ 11,030 | ¥ 12,173 |
| Increase due to new trades | 6,970 | 6,936 |
| Reduction due to redemption, sales or passage of time | (7,122) | (8,079) |
| Balance at end of period | ¥ 10,878 | ¥ 11,030 |
| X | ||||||||||
- Definition The aggregate difference between the fair value at initial recognition and the transaction price for financial instruments that is yet to be recognised in profit or loss. [Refer: Classes of financial instruments [domain]] Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition The increase (decrease) in the aggregate difference between the fair value at initial recognition and the transaction price of financial instruments yet to be recognised in profit or loss resulting from new transactions. [Refer: Aggregate difference between fair value at initial recognition and transaction price yet to be recognised in profit or loss; Classes of financial instruments [domain]] Reference 1: http://www.xbrl.org/2003/role/exampleRef
|
| X | ||||||||||
- Definition The decrease in the aggregate difference between the fair value at initial recognition and the transaction price of financial instruments yet to be recognised in profit or loss that the entity does not separately disclose in the same statement or note. [Refer: Aggregate difference between fair value at initial recognition and transaction price yet to be recognised in profit or loss; Classes of financial instruments [domain]] Reference 1: http://www.xbrl.org/2003/role/exampleRef
|