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Write-Downs of Long-Lived Assets - Breakdowns of Recognized Impairment Losses for Difference between Carrying Amounts and Fair Values Reflected as Write-Downs of Long-Lived Assets (Detail) ¥ in Millions | 6 Months Ended
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Sep. 30, 2025 JPY (¥) Property | Sep. 30, 2024 JPY (¥) Property
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |
Write-downs of the assets held for sale, amount |  | ¥ 1,122 | ¥ 240
Write-downs of the assets held for sale, number of properties | Property |  |  |
Write-downs due to decline in estimated future cash flows, amount |  | ¥ 275 | ¥ 266
Write-downs due to decline in estimated future cash flows, number of properties | Property |  |  | 0
Condominiums |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |
Write-downs of the assets held for sale, amount |  | ¥ 6 | ¥ 5
Write-downs of the assets held for sale, number of properties | Property |  | 2 | 2
Write-downs due to decline in estimated future cash flows, amount |  | ¥ 0 | ¥ 0
Write-downs due to decline in estimated future cash flows, number of properties | Property |  | 0 | 0
Others |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |
Write-downs of the assets held for sale, amount | [1] | ¥ 1,116 | ¥ 235
Write-downs due to decline in estimated future cash flows, amount | [1] | ¥ 275 | ¥ 266
[1] | For “Others,” the number of properties is omitted.

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- Definition Impairment of long lived assets to be disposed of due to decline in estimated future cash flows. + References No definition available. + Details
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- Definition Number Of Impaired Assets Impairment Due To Assets Held For Sale. + References No definition available. + Details
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- Definition Number of impaired assets impairment due to decline in estimated future cash flows. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The aggregate amount of write-downs for impairments recognized during the period for long-lived assets held for abandonment, exchange or sale. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -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 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 100 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-100 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 360 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 15 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482130/360-10-45-15 + Details
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