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Segment Information (Disaggregation of Revenues for Revenues From Contracts With Customers, by Goods and Services Category and Geographical Location) (Detail) - JPY (¥) ¥ in Millions		6 Months Ended
		Sep. 30, 2025		Sep. 30, 2024
Segment Reporting Information [Line Items]
Revenues from contracts with customers		¥ 705,583		¥ 663,040
Other revenues	[1]	858,914		740,593
Segment revenues/Total revenues		1,564,497		1,403,633
Sales of goods
Segment Reporting Information [Line Items]
Revenues from contracts with customers		144,154		131,053
Real estate sales
Segment Reporting Information [Line Items]
Revenues from contracts with customers		62,810		59,821
Asset Management and Servicing
Segment Reporting Information [Line Items]
Revenues from contracts with customers		133,261		131,354
Automobile related services
Segment Reporting Information [Line Items]
Revenues from contracts with customers		44,612		43,672
Facilities operation
Segment Reporting Information [Line Items]
Revenues from contracts with customers		51,678		40,678
Environment and energy services
Segment Reporting Information [Line Items]
Revenues from contracts with customers		88,818		87,465
Real estate management and brokerage
Segment Reporting Information [Line Items]
Revenues from contracts with customers		53,191		50,419
Real estate contract work
Segment Reporting Information [Line Items]
Revenues from contracts with customers		75,237		73,090
Other
Segment Reporting Information [Line Items]
Revenues from contracts with customers		51,822		45,488
Operating Segment
Segment Reporting Information [Line Items]
Revenues from contracts with customers		700,015		656,254
Other revenues		857,777	[1]	739,593
Segment revenues/Total revenues		1,557,792		1,395,847
Operating Segment | Sales of goods
Segment Reporting Information [Line Items]
Revenues from contracts with customers		142,027		128,326
Operating Segment | Real estate sales
Segment Reporting Information [Line Items]
Revenues from contracts with customers		62,810		59,821
Operating Segment | Asset Management and Servicing
Segment Reporting Information [Line Items]
Revenues from contracts with customers		133,424		131,470
Operating Segment | Automobile related services
Segment Reporting Information [Line Items]
Revenues from contracts with customers		44,690		43,672
Operating Segment | Facilities operation
Segment Reporting Information [Line Items]
Revenues from contracts with customers		50,809		40,003
Operating Segment | Environment and energy services
Segment Reporting Information [Line Items]
Revenues from contracts with customers		89,468		88,146
Operating Segment | Real estate management and brokerage
Segment Reporting Information [Line Items]
Revenues from contracts with customers		53,886		51,132
Operating Segment | Real estate contract work
Segment Reporting Information [Line Items]
Revenues from contracts with customers		76,064		73,986
Operating Segment | Other
Segment Reporting Information [Line Items]
Revenues from contracts with customers		46,837		39,698
Operating Segment | Corporate Financial Services and Maintenance Leasing
Segment Reporting Information [Line Items]
Revenues from contracts with customers		56,179		56,595
Other revenues		188,425		172,209
Segment revenues/Total revenues		244,604		228,804
Operating Segment | Corporate Financial Services and Maintenance Leasing | Sales of goods
Segment Reporting Information [Line Items]
Revenues from contracts with customers		2,020		1,812
Operating Segment | Corporate Financial Services and Maintenance Leasing | Real estate sales
Segment Reporting Information [Line Items]
Revenues from contracts with customers		0		0
Operating Segment | Corporate Financial Services and Maintenance Leasing | Asset Management and Servicing
Segment Reporting Information [Line Items]
Revenues from contracts with customers		101		170
Operating Segment | Corporate Financial Services and Maintenance Leasing | Automobile related services
Segment Reporting Information [Line Items]
Revenues from contracts with customers		34,607		32,327
Operating Segment | Corporate Financial Services and Maintenance Leasing | Facilities operation
Segment Reporting Information [Line Items]
Revenues from contracts with customers		0		0
Operating Segment | Corporate Financial Services and Maintenance Leasing | Environment and energy services
Segment Reporting Information [Line Items]
Revenues from contracts with customers		1,826		1,747
Operating Segment | Corporate Financial Services and Maintenance Leasing | Real estate management and brokerage
Segment Reporting Information [Line Items]
Revenues from contracts with customers		0		0
Operating Segment | Corporate Financial Services and Maintenance Leasing | Real estate contract work
Segment Reporting Information [Line Items]
Revenues from contracts with customers		396		0
Operating Segment | Corporate Financial Services and Maintenance Leasing | Other
Segment Reporting Information [Line Items]
Revenues from contracts with customers		17,229		20,539
Operating Segment | Real Estate
Segment Reporting Information [Line Items]
Revenues from contracts with customers		222,511		208,515
Other revenues		51,343		51,664
Segment revenues/Total revenues		273,854		260,179
Operating Segment | Real Estate | Sales of goods
Segment Reporting Information [Line Items]
Revenues from contracts with customers		2,155		1,972
Operating Segment | Real Estate | Real estate sales
Segment Reporting Information [Line Items]
Revenues from contracts with customers		62,810		59,821
Operating Segment | Real Estate | Asset Management and Servicing
Segment Reporting Information [Line Items]
Revenues from contracts with customers		3,815		3,549
Operating Segment | Real Estate | Automobile related services
Segment Reporting Information [Line Items]
Revenues from contracts with customers		0		0
Operating Segment | Real Estate | Facilities operation
Segment Reporting Information [Line Items]
Revenues from contracts with customers		50,019		40,003
Operating Segment | Real Estate | Environment and energy services
Segment Reporting Information [Line Items]
Revenues from contracts with customers		24		23
Operating Segment | Real Estate | Real estate management and brokerage
Segment Reporting Information [Line Items]
Revenues from contracts with customers		53,886		51,132
Operating Segment | Real Estate | Real estate contract work
Segment Reporting Information [Line Items]
Revenues from contracts with customers		49,015		51,013
Operating Segment | Real Estate | Other
Segment Reporting Information [Line Items]
Revenues from contracts with customers		787		1,002
Operating Segment | PE Investment and Concession
Segment Reporting Information [Line Items]
Revenues from contracts with customers		173,095		153,857
Other revenues		24,400		27,169
Segment revenues/Total revenues		197,495		181,026
Operating Segment | PE Investment and Concession | Sales of goods
Segment Reporting Information [Line Items]
Revenues from contracts with customers		134,971		122,384
Operating Segment | PE Investment and Concession | Real estate sales
Segment Reporting Information [Line Items]
Revenues from contracts with customers		0		0
Operating Segment | PE Investment and Concession | Asset Management and Servicing
Segment Reporting Information [Line Items]
Revenues from contracts with customers		0		0
Operating Segment | PE Investment and Concession | Automobile related services
Segment Reporting Information [Line Items]
Revenues from contracts with customers		0		0
Operating Segment | PE Investment and Concession | Facilities operation
Segment Reporting Information [Line Items]
Revenues from contracts with customers		790		0
Operating Segment | PE Investment and Concession | Environment and energy services
Segment Reporting Information [Line Items]
Revenues from contracts with customers		0		36
Operating Segment | PE Investment and Concession | Real estate management and brokerage
Segment Reporting Information [Line Items]
Revenues from contracts with customers		0		0
Operating Segment | PE Investment and Concession | Real estate contract work
Segment Reporting Information [Line Items]
Revenues from contracts with customers		26,653		22,973
Operating Segment | PE Investment and Concession | Other
Segment Reporting Information [Line Items]
Revenues from contracts with customers		10,681		8,464
Operating Segment | Environment and Energy
Segment Reporting Information [Line Items]
Revenues from contracts with customers		90,180		88,300
Other revenues		24,561		662
Segment revenues/Total revenues		114,741		88,962
Operating Segment | Environment and Energy | Sales of goods
Segment Reporting Information [Line Items]
Revenues from contracts with customers		1,534		1,481
Operating Segment | Environment and Energy | Real estate sales
Segment Reporting Information [Line Items]
Revenues from contracts with customers		0		0
Operating Segment | Environment and Energy | Asset Management and Servicing
Segment Reporting Information [Line Items]
Revenues from contracts with customers		68		63
Operating Segment | Environment and Energy | Automobile related services
Segment Reporting Information [Line Items]
Revenues from contracts with customers		93		106
Operating Segment | Environment and Energy | Facilities operation
Segment Reporting Information [Line Items]
Revenues from contracts with customers		0		0
Operating Segment | Environment and Energy | Environment and energy services
Segment Reporting Information [Line Items]
Revenues from contracts with customers		87,618		86,340
Operating Segment | Environment and Energy | Real estate management and brokerage
Segment Reporting Information [Line Items]
Revenues from contracts with customers		0		0
Operating Segment | Environment and Energy | Real estate contract work
Segment Reporting Information [Line Items]
Revenues from contracts with customers		0		0
Operating Segment | Environment and Energy | Other
Segment Reporting Information [Line Items]
Revenues from contracts with customers		867		310
Operating Segment | Insurance
Segment Reporting Information [Line Items]
Revenues from contracts with customers		0		(1)
Other revenues		301,019		235,173
Segment revenues/Total revenues		301,019		235,172
Operating Segment | Insurance | Sales of goods
Segment Reporting Information [Line Items]
Revenues from contracts with customers		0		0
Operating Segment | Insurance | Real estate sales
Segment Reporting Information [Line Items]
Revenues from contracts with customers		0		0
Operating Segment | Insurance | Asset Management and Servicing
Segment Reporting Information [Line Items]
Revenues from contracts with customers		0		0
Operating Segment | Insurance | Automobile related services
Segment Reporting Information [Line Items]
Revenues from contracts with customers		0		0
Operating Segment | Insurance | Facilities operation
Segment Reporting Information [Line Items]
Revenues from contracts with customers		0		0
Operating Segment | Insurance | Environment and energy services
Segment Reporting Information [Line Items]
Revenues from contracts with customers		0		0
Operating Segment | Insurance | Real estate management and brokerage
Segment Reporting Information [Line Items]
Revenues from contracts with customers		0		0
Operating Segment | Insurance | Real estate contract work
Segment Reporting Information [Line Items]
Revenues from contracts with customers		0		0
Operating Segment | Insurance | Other
Segment Reporting Information [Line Items]
Revenues from contracts with customers		0		(1)
Operating Segment | Banking and Credit
Segment Reporting Information [Line Items]
Revenues from contracts with customers		1,237		1,567
Other revenues		35,666		28,883
Segment revenues/Total revenues		36,903		30,450
Operating Segment | Banking and Credit | Sales of goods
Segment Reporting Information [Line Items]
Revenues from contracts with customers		0		0
Operating Segment | Banking and Credit | Real estate sales
Segment Reporting Information [Line Items]
Revenues from contracts with customers		0		0
Operating Segment | Banking and Credit | Asset Management and Servicing
Segment Reporting Information [Line Items]
Revenues from contracts with customers		0		0
Operating Segment | Banking and Credit | Automobile related services
Segment Reporting Information [Line Items]
Revenues from contracts with customers		0		0
Operating Segment | Banking and Credit | Facilities operation
Segment Reporting Information [Line Items]
Revenues from contracts with customers		0		0
Operating Segment | Banking and Credit | Environment and energy services
Segment Reporting Information [Line Items]
Revenues from contracts with customers		0		0
Operating Segment | Banking and Credit | Real estate management and brokerage
Segment Reporting Information [Line Items]
Revenues from contracts with customers		0		0
Operating Segment | Banking and Credit | Real estate contract work
Segment Reporting Information [Line Items]
Revenues from contracts with customers		0		0
Operating Segment | Banking and Credit | Other
Segment Reporting Information [Line Items]
Revenues from contracts with customers		1,237		1,567
Operating Segment | Aircraft and Ships
Segment Reporting Information [Line Items]
Revenues from contracts with customers		9,617		5,930
Other revenues		46,319		45,372
Segment revenues/Total revenues		55,936		51,302
Operating Segment | Aircraft and Ships | Sales of goods
Segment Reporting Information [Line Items]
Revenues from contracts with customers		553		196
Operating Segment | Aircraft and Ships | Real estate sales
Segment Reporting Information [Line Items]
Revenues from contracts with customers		0		0
Operating Segment | Aircraft and Ships | Asset Management and Servicing
Segment Reporting Information [Line Items]
Revenues from contracts with customers		16		22
Operating Segment | Aircraft and Ships | Automobile related services
Segment Reporting Information [Line Items]
Revenues from contracts with customers		0		0
Operating Segment | Aircraft and Ships | Facilities operation
Segment Reporting Information [Line Items]
Revenues from contracts with customers		0		0
Operating Segment | Aircraft and Ships | Environment and energy services
Segment Reporting Information [Line Items]
Revenues from contracts with customers		0		0
Operating Segment | Aircraft and Ships | Real estate management and brokerage
Segment Reporting Information [Line Items]
Revenues from contracts with customers		0		0
Operating Segment | Aircraft and Ships | Real estate contract work
Segment Reporting Information [Line Items]
Revenues from contracts with customers		0		0
Operating Segment | Aircraft and Ships | Other
Segment Reporting Information [Line Items]
Revenues from contracts with customers		9,048		5,712
Operating Segment | ORIX USA
Segment Reporting Information [Line Items]
Revenues from contracts with customers		12,991		8,456
Other revenues		71,681	[1]	67,209
Segment revenues/Total revenues		84,672		75,665
Operating Segment | ORIX USA | Sales of goods
Segment Reporting Information [Line Items]
Revenues from contracts with customers		575		235
Operating Segment | ORIX USA | Real estate sales
Segment Reporting Information [Line Items]
Revenues from contracts with customers		0		0
Operating Segment | ORIX USA | Asset Management and Servicing
Segment Reporting Information [Line Items]
Revenues from contracts with customers		6,265		6,845
Operating Segment | ORIX USA | Automobile related services
Segment Reporting Information [Line Items]
Revenues from contracts with customers		0		0
Operating Segment | ORIX USA | Facilities operation
Segment Reporting Information [Line Items]
Revenues from contracts with customers		0		0
Operating Segment | ORIX USA | Environment and energy services
Segment Reporting Information [Line Items]
Revenues from contracts with customers		0		0
Operating Segment | ORIX USA | Real estate management and brokerage
Segment Reporting Information [Line Items]
Revenues from contracts with customers		0		0
Operating Segment | ORIX USA | Real estate contract work
Segment Reporting Information [Line Items]
Revenues from contracts with customers		0		0
Operating Segment | ORIX USA | Other
Segment Reporting Information [Line Items]
Revenues from contracts with customers		6,151		1,376
Operating Segment | ORIX Europe
Segment Reporting Information [Line Items]
Revenues from contracts with customers		122,930		120,866
Other revenues		10,955	[1]	5,811
Segment revenues/Total revenues		133,885		126,677
Operating Segment | ORIX Europe | Sales of goods
Segment Reporting Information [Line Items]
Revenues from contracts with customers		0		0
Operating Segment | ORIX Europe | Real estate sales
Segment Reporting Information [Line Items]
Revenues from contracts with customers		0		0
Operating Segment | ORIX Europe | Asset Management and Servicing
Segment Reporting Information [Line Items]
Revenues from contracts with customers		122,908		120,784
Operating Segment | ORIX Europe | Automobile related services
Segment Reporting Information [Line Items]
Revenues from contracts with customers		0		0
Operating Segment | ORIX Europe | Facilities operation
Segment Reporting Information [Line Items]
Revenues from contracts with customers		0		0
Operating Segment | ORIX Europe | Environment and energy services
Segment Reporting Information [Line Items]
Revenues from contracts with customers		0		0
Operating Segment | ORIX Europe | Real estate management and brokerage
Segment Reporting Information [Line Items]
Revenues from contracts with customers		0		0
Operating Segment | ORIX Europe | Real estate contract work
Segment Reporting Information [Line Items]
Revenues from contracts with customers		0		0
Operating Segment | ORIX Europe | Other
Segment Reporting Information [Line Items]
Revenues from contracts with customers		22		82
Operating Segment | Asia and Australia
Segment Reporting Information [Line Items]
Revenues from contracts with customers		11,275		12,169
Other revenues		103,408	[1]	105,441
Segment revenues/Total revenues		114,683		117,610
Operating Segment | Asia and Australia | Sales of goods
Segment Reporting Information [Line Items]
Revenues from contracts with customers		219		246
Operating Segment | Asia and Australia | Real estate sales
Segment Reporting Information [Line Items]
Revenues from contracts with customers		0		0
Operating Segment | Asia and Australia | Asset Management and Servicing
Segment Reporting Information [Line Items]
Revenues from contracts with customers		251		37
Operating Segment | Asia and Australia | Automobile related services
Segment Reporting Information [Line Items]
Revenues from contracts with customers		9,990		11,239
Operating Segment | Asia and Australia | Facilities operation
Segment Reporting Information [Line Items]
Revenues from contracts with customers		0		0
Operating Segment | Asia and Australia | Environment and energy services
Segment Reporting Information [Line Items]
Revenues from contracts with customers		0		0
Operating Segment | Asia and Australia | Real estate management and brokerage
Segment Reporting Information [Line Items]
Revenues from contracts with customers		0		0
Operating Segment | Asia and Australia | Real estate contract work
Segment Reporting Information [Line Items]
Revenues from contracts with customers		0		0
Operating Segment | Asia and Australia | Other
Segment Reporting Information [Line Items]
Revenues from contracts with customers		815		647
Corporate And Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenues from contracts with customers		5,568		6,786
Other revenues		1,137	[1]	1,000
Segment revenues/Total revenues		6,705		7,786
Corporate And Intersegment Eliminations [Member] | Sales of goods
Segment Reporting Information [Line Items]
Revenues from contracts with customers		2,127		2,727
Corporate And Intersegment Eliminations [Member] | Real estate sales
Segment Reporting Information [Line Items]
Revenues from contracts with customers		0		0
Corporate And Intersegment Eliminations [Member] | Asset Management and Servicing
Segment Reporting Information [Line Items]
Revenues from contracts with customers		(163)		(116)
Corporate And Intersegment Eliminations [Member] | Automobile related services
Segment Reporting Information [Line Items]
Revenues from contracts with customers		(78)		0
Corporate And Intersegment Eliminations [Member] | Facilities operation
Segment Reporting Information [Line Items]
Revenues from contracts with customers		869		675
Corporate And Intersegment Eliminations [Member] | Environment and energy services
Segment Reporting Information [Line Items]
Revenues from contracts with customers		(650)		(681)
Corporate And Intersegment Eliminations [Member] | Real estate management and brokerage
Segment Reporting Information [Line Items]
Revenues from contracts with customers		(695)		(713)
Corporate And Intersegment Eliminations [Member] | Real estate contract work
Segment Reporting Information [Line Items]
Revenues from contracts with customers		(827)		(896)
Corporate And Intersegment Eliminations [Member] | Other
Segment Reporting Information [Line Items]
Revenues from contracts with customers		¥ 4,985		¥ 5,790
[1] Other revenues include revenues that are not in the scope of revenue from contracts with customers, such as life insurance premiums and related investment income, operating leases, finance revenues that include interest income, and others.

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