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Revenues from Contracts with Customers - Summary of Revenues from Contracts with Customers, and Other Sources of Revenue (Detail) - JPY (¥) ¥ in Millions | 12 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022 | Mar. 31, 2021
Revenue From Contract With Customers [Line Items] |  |  |  |
Total revenues from contracts with customers |  | ¥ 1,303,365 | ¥ 1,246,098 | ¥ 1,087,555
Other revenues | [1] | 19,355 | 5,904 | 3,247
Total sales of goods and real estate and services income |  | 2,666,373 | 2,520,365 | 2,292,708
Sales of goods |  |  |  |
Revenue From Contract With Customers [Line Items] |  |  |  |
Total revenues from contracts with customers |  | 299,901 | 340,697 | 321,883
Real estate sales |  |  |  |
Revenue From Contract With Customers [Line Items] |  |  |  |
Total revenues from contracts with customers |  | 92,668 | 94,700 | 89,070
Asset management and servicing |  |  |  |
Revenue From Contract With Customers [Line Items] |  |  |  |
Total revenues from contracts with customers |  | 239,232 | 244,887 | 173,191
Automobile related services |  |  |  |
Revenue From Contract With Customers [Line Items] |  |  |  |
Total revenues from contracts with customers |  | 82,428 | 76,772 | 72,000
Facilities operation |  |  |  |
Revenue From Contract With Customers [Line Items] |  |  |  |
Total revenues from contracts with customers |  | 56,231 | 32,163 | 23,811
Environment and energy services |  |  |  |
Revenue From Contract With Customers [Line Items] |  |  |  |
Total revenues from contracts with customers |  | 209,649 | 156,327 | 137,011
Real estate management and brokerage |  |  |  |
Revenue From Contract With Customers [Line Items] |  |  |  |
Total revenues from contracts with customers |  | 98,593 | 100,304 | 101,942
Real estate contract work |  |  |  |
Revenue From Contract With Customers [Line Items] |  |  |  |
Total revenues from contracts with customers |  | 120,379 | 92,999 | 80,179
Other |  |  |  |
Revenue From Contract With Customers [Line Items] |  |  |  |
Total revenues from contracts with customers |  | 104,284 | 107,249 | 88,468
Sales of goods, Real estate and Services [Member] |  |  |  |
Revenue From Contract With Customers [Line Items] |  |  |  |
Total sales of goods and real estate and services income |  | ¥ 1,322,720 | ¥ 1,252,002 | ¥ 1,090,802
[1] | Other revenues are not in the scope of revenue from contracts with customers.

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8906-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e9031-108599 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e9038-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8933-108599 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8933-108599 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130543-203045 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8736-108599 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8736-108599 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e9054-108599 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130545-203045 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 924 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 11.L) -URI https://asc.fasb.org/extlink&oid=6472922&loc=d3e499488-122856 + Details
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