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Commitments, Guarantees, and Contingent Liabilities - Additional Information (Detail) - JPY (¥) ¥ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Mar. 31, 2023
Commitments and Contingencies Disclosure [Line Items]
Commitments for purchase of equipment to be leased at cost			¥ 9,786		¥ 4,066
Payments for computer systems under non-cancelable contracts	¥ 2,132	¥ 2,055	4,240	¥ 4,138
Estimated construction costs	119,923		119,923		146,945
Total unused credit and capital amount available	493,570		493,570		458,994
Guarantee Obligations Maximum Exposure	1,316,556		1,316,556		1,231,425
Guarantee Obligations Current Carrying Value	57,485		57,485		57,456
Outstanding principal amount of loans transferred under Delegated Underwriting and Servicing program	2,543,499		2,543,499		2,175,722
Provision for credit losses in the consolidated statements of income	171	¥ (225)	591	¥ (868)
Investment in securities pledged for primarily collateral deposits	367,973		367,973		407,495
Investments In Subsidaries Pledged	9,530		9,530		9,911
Other liabilities
Commitments and Contingencies Disclosure [Line Items]
Allowance for off-balance sheet credit exposure	18,783		18,783		17,843
Secured By Share
Commitments and Contingencies Disclosure [Line Items]
Secured debt	31,407		31,407		31,379
Secured Investments
Commitments and Contingencies Disclosure [Line Items]
Secured debt	166,216		166,216		101,827
Corporate Loans
Commitments and Contingencies Disclosure [Line Items]
Guarantee Obligations Maximum Exposure	485,438		485,438		479,406
Guarantee Obligations Current Carrying Value	4,729		4,729		5,033
Performance Guarantee | Corporate Loans
Commitments and Contingencies Disclosure [Line Items]
Guarantee Obligations Maximum Exposure	494,000		494,000		494,000
Guarantee Obligations Current Carrying Value	¥ 2,188		¥ 2,188		¥ 2,309

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Amount of securities, mortgage loans, or other financial instruments pledged as collateral for deposits.

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The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees.

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Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions.

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Amount of expected credit loss for credit exposure on off-balance-sheet commitment, including but not limited to, loan commitment, standby letter of credit, financial guarantee not accounted for as insurance. Excludes off-balance sheet credit exposure accounted for as insurance and instrument accounted for under derivatives and hedging.

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Carrying amount of collateralized debt obligations with maturities initially due after one year or beyond the operating cycle, if longer, excluding the current portion. Obligations include, but not limited to, mortgage loans, chattel loans, and other borrowings secured by assets.

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