v3.26.1
Segment Information (Disaggregation of Revenues for Revenues From Contracts With Customers, by Goods and Services Category and Geographical Location) (Detail) - JPY (¥)
¥ in Millions
 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2024
Segment Reporting Information [Line Items]      
Revenues from contracts with customers ¥ 1,504,029 ¥ 1,352,263 ¥ 1,299,965
Other revenues [1] 1,826,802 1,522,558 1,514,396
Segment revenues /Total revenues 3,330,831 2,874,821 2,814,361
Sales of goods      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 320,653 269,050 266,390
Real estate sales      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 121,933 104,105 107,524
Asset Management and Servicing      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 297,626 275,929 244,508
Automobile related services      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 93,011 87,173 88,325
Facilities operation      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 102,956 83,559 76,087
Environment and energy services      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 169,047 175,651 158,075
Real estate management and brokerage      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 107,010 102,369 99,843
Real estate contract work      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 164,262 162,921 152,022
Other      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 127,531 91,506 107,191
Operating Segment      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 1,500,960 1,349,608 1,291,605
Other revenues [1] 1,825,186 1,521,797 1,513,316
Segment revenues /Total revenues 3,326,146 2,871,405 2,804,921
Operating Segment | Sales of goods      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 317,596 266,378 261,403
Operating Segment | Real estate sales      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 121,933 104,105 107,524
Operating Segment | Asset Management and Servicing      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 298,080 276,175 244,751
Operating Segment | Automobile related services      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 93,165 87,183 88,322
Operating Segment | Facilities operation      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 101,338 82,153 74,989
Operating Segment | Environment and energy services      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 170,429 176,961 159,557
Operating Segment | Real estate management and brokerage      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 108,355 103,831 101,229
Operating Segment | Real estate contract work      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 166,833 166,891 152,108
Operating Segment | Other      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 123,231 85,931 101,722
Operating Segment | Corporate Financial Services and Maintenance Leasing      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 115,928 112,348 114,034
Other revenues [1] 371,914 348,351 330,925
Segment revenues /Total revenues 487,842 460,699 444,959
Operating Segment | Corporate Financial Services and Maintenance Leasing | Sales of goods      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 4,689 4,202 3,934
Operating Segment | Corporate Financial Services and Maintenance Leasing | Real estate sales      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | Corporate Financial Services and Maintenance Leasing | Asset Management and Servicing      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 102 418 318
Operating Segment | Corporate Financial Services and Maintenance Leasing | Automobile related services      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 70,671 65,250 65,942
Operating Segment | Corporate Financial Services and Maintenance Leasing | Facilities operation      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | Corporate Financial Services and Maintenance Leasing | Environment and energy services      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 3,161 3,013 2,958
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 0
Operating Segment | Corporate Financial Services and Maintenance Leasing | Real estate contract work      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 1,141 574 0
Operating Segment | Corporate Financial Services and Maintenance Leasing | Other      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 36,164 38,891 40,882
Operating Segment | Real Estate      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 450,491 419,807 403,291
Other revenues [1] 80,410 77,973 68,401
Segment revenues /Total revenues 530,901 497,780 471,692
Operating Segment | Real Estate | Sales of goods      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 4,141 3,754 3,536
Operating Segment | Real Estate | Real estate sales      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 121,933 104,105 107,477
Operating Segment | Real Estate | Asset Management and Servicing      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 8,157 8,958 9,662
Operating Segment | Real Estate | Automobile related services      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | Real Estate | Facilities operation      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 97,994 82,153 74,989
Operating Segment | Real Estate | Environment and energy services      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 40 39 41
Operating Segment | Real Estate | Real estate management and brokerage      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 108,355 103,831 101,229
Operating Segment | Real Estate | Real estate contract work      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 108,424 115,437 104,875
Operating Segment | Real Estate | Other      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 1,447 1,530 1,482
Operating Segment | PE Investment and Concession      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 387,985 322,242 329,772
Other revenues [1] 53,968 55,689 49,396
Segment revenues /Total revenues 441,953 377,931 379,168
Operating Segment | PE Investment and Concession | Sales of goods      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 301,345 252,969 249,085
Operating Segment | PE Investment and Concession | Real estate sales      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | PE Investment and Concession | Asset Management and Servicing      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | PE Investment and Concession | Automobile related services      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | PE Investment and Concession | Facilities operation      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 3,344 0 0
Operating Segment | PE Investment and Concession | Environment and energy services      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 78 83
Operating Segment | PE Investment and Concession | Real estate management and brokerage      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | PE Investment and Concession | Real estate contract work      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 57,268 50,880 47,233
Operating Segment | PE Investment and Concession | Other      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 26,028 18,315 33,371
Operating Segment | Environment and Energy      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 172,444 178,221 160,612
Other revenues [1] 36,787 7,800 4,986
Segment revenues /Total revenues 209,231 186,021 165,598
Operating Segment | Environment and Energy | Sales of goods      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 3,311 3,307 3,771
Operating Segment | Environment and Energy | Real estate sales      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | Environment and Energy | Asset Management and Servicing      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 97 24 (6)
Operating Segment | Environment and Energy | Automobile related services      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 159 196 239
Operating Segment | Environment and Energy | Facilities operation      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | Environment and Energy | Environment and energy services      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 167,228 173,831 155,838
Operating Segment | Environment and Energy | Real estate management and brokerage      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | Environment and Energy | Real estate contract work      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | Environment and Energy | Other      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 1,649 863 770
Operating Segment | Insurance      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 (1) 2,036
Other revenues [1] 643,045 518,364 561,833
Segment revenues /Total revenues 643,045 518,363 563,869
Operating Segment | Insurance | Sales of goods      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | Insurance | Real estate sales      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | Insurance | Asset Management and Servicing      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | Insurance | Automobile related services      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | Insurance | Facilities operation      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | Insurance | Environment and energy services      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | Insurance | Real estate management and brokerage      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | Insurance | Real estate contract work      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | Insurance | Other      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 (1) 2,036
Operating Segment | Banking and Credit      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 2,884 2,914 7,321
Other revenues [1] 73,555 60,390 81,253
Segment revenues /Total revenues 76,439 63,304 88,574
Operating Segment | Banking and Credit | Sales of goods      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | Banking and Credit | Real estate sales      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | Banking and Credit | Asset Management and Servicing      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 615
Operating Segment | Banking and Credit | Automobile related services      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | Banking and Credit | Facilities operation      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | Banking and Credit | Environment and energy services      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | Banking and Credit | Real estate management and brokerage      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | Banking and Credit | Real estate contract work      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | Banking and Credit | Other      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 2,884 2,914 6,706
Operating Segment | Aircraft and Ships      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 23,064 16,991 9,478
Other revenues [1] 106,952 102,601 55,713
Segment revenues /Total revenues 130,016 119,592 65,191
Operating Segment | Aircraft and Ships | Sales of goods      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 1,093 852 97
Operating Segment | Aircraft and Ships | Real estate sales      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | Aircraft and Ships | Asset Management and Servicing      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 22 38 53
Operating Segment | Aircraft and Ships | Automobile related services      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | Aircraft and Ships | Facilities operation      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | Aircraft and Ships | Environment and energy services      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | Aircraft and Ships | Real estate management and brokerage      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | Aircraft and Ships | Real estate contract work      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | Aircraft and Ships | Other      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 21,949 16,101 9,328
Operating Segment | ORIX USA      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 49,728 24,364 27,135
Other revenues [1] 222,491 129,864 146,291
Segment revenues /Total revenues 272,219 154,228 173,426
Operating Segment | ORIX USA | Sales of goods      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 2,535 543 555
Operating Segment | ORIX USA | Real estate sales      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 47
Operating Segment | ORIX USA | Asset Management and Servicing      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 15,604 17,901 20,157
Operating Segment | ORIX USA | Automobile related services      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | ORIX USA | Facilities operation      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | ORIX USA | Environment and energy services      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 637
Operating Segment | ORIX USA | Real estate management and brokerage      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | ORIX USA | Real estate contract work      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | ORIX USA | Other      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 31,589 5,920 5,739
Operating Segment | ORIX Europe      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 273,857 248,782 214,031
Other revenues [1] 17,229 8,485 13,120
Segment revenues /Total revenues 291,086 257,267 227,151
Operating Segment | ORIX Europe | Sales of goods      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | ORIX Europe | Real estate sales      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | ORIX Europe | Asset Management and Servicing      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 273,831 248,664 213,908
Operating Segment | ORIX Europe | Automobile related services      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | ORIX Europe | Facilities operation      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | ORIX Europe | Environment and energy services      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | ORIX Europe | Real estate management and brokerage      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | ORIX Europe | Real estate contract work      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | ORIX Europe | Other      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 26 118 123
Operating Segment | Asia and Australia      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 24,579 23,940 23,895
Other revenues [1] 218,835 212,280 201,398
Segment revenues /Total revenues 243,414 236,220 225,293
Operating Segment | Asia and Australia | Sales of goods      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 482 751 425
Operating Segment | Asia and Australia | Real estate sales      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | Asia and Australia | Asset Management and Servicing      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 267 172 44
Operating Segment | Asia and Australia | Automobile related services      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 22,335 21,737 22,141
Operating Segment | Asia and Australia | Facilities operation      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | Asia and Australia | Environment and energy services      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | Asia and Australia | Real estate management and brokerage      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | Asia and Australia | Real estate contract work      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | Asia and Australia | Other      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 1,495 1,280 1,285
Corporate And Intersegment Eliminations [Member]      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 3,069 2,655 8,360
Other revenues [1] 1,616 761 1,080
Segment revenues /Total revenues 4,685 3,416 9,440
Corporate And Intersegment Eliminations [Member] | Sales of goods      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 3,057 2,672 4,987
Corporate And Intersegment Eliminations [Member] | Real estate sales      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Corporate And Intersegment Eliminations [Member] | Asset Management and Servicing      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers (454) (246) (243)
Corporate And Intersegment Eliminations [Member] | Automobile related services      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers (154) (10) 3
Corporate And Intersegment Eliminations [Member] | Facilities operation      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 1,618 1,406 1,098
Corporate And Intersegment Eliminations [Member] | Environment and energy services      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers (1,382) (1,310) (1,482)
Corporate And Intersegment Eliminations [Member] | Real estate management and brokerage      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers (1,345) (1,462) (1,386)
Corporate And Intersegment Eliminations [Member] | Real estate contract work      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers (2,571) (3,970) (86)
Corporate And Intersegment Eliminations [Member] | Other      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers ¥ 4,300 ¥ 5,575 ¥ 5,469
[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.