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v3.25.3

Commitments, Guarantees, and Contingent Liabilities - Additional Information (Detail) - JPY (¥) ¥ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Mar. 31, 2025
Commitments and Contingencies Disclosure [Line Items] |  |  |
Commitments for purchase of equipment to be leased at cost | ¥ 10,253 |  | ¥ 11,491
Payments for computer systems under non-cancelable contracts | 4,749 | ¥ 4,947 |
Estimated construction costs | 86,181 |  | 143,120
Total unused credit and capital amount available | 472,893 |  | 437,496
Guarantee Obligations Maximum Exposure | 1,139,630 |  | 1,123,984
Guarantee Obligations Current Carrying Value | 14,100 |  | 12,276
Outstanding principal amount of loans transferred under Delegated Underwriting and Servicing program | 2,714,225 |  | 2,683,671
Investments In Subsidaries Pledged | 14,874 |  | 14,708
Provision for credit losses in the consolidated statements of income | 2,320 | ¥ 1,673 |
Integrated Resort Development [Member] |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |
Total unused credit and capital amount available | 361,468 |  | 270,168
Other liabilities |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |
Allowance for off-balance sheet credit exposure | 11,953 |  | 9,766
Secured Investments |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |
Secured debt | 351,696 |  | 180,248
Secured By Share |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |
Investment in securities pledged for primarily collateral deposits | 169,304 |  | 154,926
Secured debt | 118,736 |  | 89,021
Corporate Loans |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |
Guarantee Obligations Maximum Exposure | 570,319 |  | 558,862
Guarantee Obligations Current Carrying Value | 5,565 |  | 5,223
Performance Guarantee | Corporate Loans |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |
Guarantee Obligations Maximum Exposure | 474,000 |  | 469,000
Guarantee Obligations Current Carrying Value | ¥ 2,476 |  | ¥ 2,474

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- Definition Deposit liabilitites collateral issued financial instruments one. + References No definition available. + Details
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- Definition Amount of securities, mortgage loans, or other financial instruments pledged as collateral for deposits. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 942 -SubTopic 405 -Section 50 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478353/942-405-50-1 + Details
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- Definition The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 460 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482425/460-10-50-4 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 460 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482425/460-10-50-4 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479344/326-20-45-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 460 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482454/460-10-45-1 + Details
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- Definition Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (a) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-28 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 220 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 21 -Publisher FASB -URI https://asc.fasb.org/1943274/2147476153/220-40-55-21 Reference 3: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11B -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481962/310-10-50-11B Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(11)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478524/942-220-S99-1 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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