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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 (Parenthetical) (Detail) - JPY (¥) ¥ in Millions | 12 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022 | Mar. 31, 2021
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |
Write-downs of long-lived assets |  | ¥ 243 | ¥ 12,749 | ¥ 1,067
Property, Plant and Equipment, Other Types |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |
Write-downs of long-lived assets | [1] | ¥ 241 | 11,878 | 0
Property, Plant and Equipment, Other Types | Hotel |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |
Write-downs of long-lived assets |  |  |  | ¥ 1,099
Property, Plant and Equipment, Other Types | Property under Facility Operations |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |
Write-downs of long-lived assets |  |  | 31,205 |
Property, Plant and Equipment, Other Types | Coal-biomass co-fired power plants [Member] |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |
Write-downs of long-lived assets |  |  | 19,564 |
Property, Plant and Equipment, Other Types | Aircraft |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |
Write-downs of long-lived assets |  |  | ¥ 2,331 |
[1] | For the “Others”, the numbers of properties are omitted. Write-downs of long-lived assets for fiscal 2021 include write-downs of ¥1,099 million of hotels. Write-downs of long-lived assets for fiscal 2022 include write-downs of ¥31,205 million of property under facility operations and others held by subsidiaries, of which ¥19,564 million related to write-downs of two coal-biomass co-fired power plants, and ¥2,331 million of two aircraft.

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 15 -URI https://asc.fasb.org/extlink&oid=126905981&loc=d3e2611-110228 + Details
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