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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
 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Segment Reporting Information [Line Items]      
Segment revenues /Total revenues ¥ 2,280,329 ¥ 2,434,864 ¥ 2,862,771
Sales of Goods      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 287,558 462,029  
Real Estate Sales      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 118,953 134,136  
Asset Management and Servicing      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 181,851 191,820  
Automobile related services      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 77,987 78,723  
Facilities operation      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 69,297 104,005  
Environment and energy services      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 141,532 132,243  
Real estate management and brokerage      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 104,110 103,062  
Real estate contract work      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 88,966 82,217  
Other      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 104,059 107,341  
Sales of Goods and Real Estate and Service [Member]      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 1,174,313 1,395,576  
Segment revenues /Total revenues 1,182,523 1,414,959  
Other Revenue      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers [1] 1,106,016 1,039,288  
Japan      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 964,641 1,169,792  
The Americas      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 99,979 114,614  
Other Countries      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 109,693 111,170  
Operating Segment      
Segment Reporting Information [Line Items]      
Segment revenues /Total revenues 2,292,360 2,447,272 2,873,343
Operating Segment | Sales of Goods      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 286,199 460,676  
Operating Segment | Real Estate Sales      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 118,953 134,136  
Operating Segment | Asset Management and Servicing      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 181,951 191,927  
Operating Segment | Automobile related services      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 78,374 79,082  
Operating Segment | Facilities operation      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 69,297 104,006  
Operating Segment | Environment and energy services      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 142,254 133,173  
Operating Segment | Real estate management and brokerage      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 106,234 105,278  
Operating Segment | Real estate contract work      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 89,522 83,182  
Operating Segment | Other      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 107,293 112,697  
Operating Segment | Sales of Goods and Real Estate and Service [Member]      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 1,180,077 1,404,157  
Operating Segment | Other Revenue      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers [1] 1,112,283 1,043,115  
Operating Segment | Corporate Financial Services      
Segment Reporting Information [Line Items]      
Segment revenues /Total revenues 97,007 95,212 115,837
Operating Segment | Corporate Financial Services | Sales of Goods      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 5,707 4,379  
Operating Segment | Corporate Financial Services | Real Estate Sales      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0  
Operating Segment | Corporate Financial Services | Asset Management and Servicing      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0  
Operating Segment | Corporate Financial Services | Automobile related services      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 488 486  
Operating Segment | Corporate Financial Services | Facilities operation      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0  
Operating Segment | Corporate Financial Services | Environment and energy services      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 2,911 2,815  
Operating Segment | Corporate Financial Services | Real estate management and brokerage      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0  
Operating Segment | Corporate Financial Services | Real estate contract work      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0  
Operating Segment | Corporate Financial Services | Other      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 36,340 35,958  
Operating Segment | Corporate Financial Services | Sales of Goods and Real Estate and Service [Member]      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 45,446 43,638  
Operating Segment | Corporate Financial Services | Other Revenue      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers [1] 51,561 51,574  
Operating Segment | Maintenance Leasing      
Segment Reporting Information [Line Items]      
Segment revenues /Total revenues 336,438 288,211 275,933
Operating Segment | Maintenance Leasing | Sales of Goods      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 5,829 5,392  
Operating Segment | Maintenance Leasing | Real Estate Sales      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0  
Operating Segment | Maintenance Leasing | Asset Management and Servicing      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0  
Operating Segment | Maintenance Leasing | Automobile related services      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 60,704 61,398  
Operating Segment | Maintenance Leasing | Facilities operation      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0  
Operating Segment | Maintenance Leasing | Environment and energy services      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0  
Operating Segment | Maintenance Leasing | Real estate management and brokerage      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0  
Operating Segment | Maintenance Leasing | Real estate contract work      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0  
Operating Segment | Maintenance Leasing | Other      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 10,630 9,153  
Operating Segment | Maintenance Leasing | Sales of Goods and Real Estate and Service [Member]      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 77,163 75,943  
Operating Segment | Maintenance Leasing | Other Revenue      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers [1] 259,275 212,268  
Operating Segment | Real Estate      
Segment Reporting Information [Line Items]      
Segment revenues /Total revenues 466,639 529,064 489,752
Operating Segment | Real Estate | Sales of Goods      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 4,261 8,063  
Operating Segment | Real Estate | Real Estate Sales      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 117,969 133,426  
Operating Segment | Real Estate | Asset Management and Servicing      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 7,453 5,523  
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 68,934 100,940  
Operating Segment | Real Estate | Environment and energy services      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 188  
Operating Segment | Real Estate | Real estate management and brokerage      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 106,234 105,278  
Operating Segment | Real Estate | Real estate contract work      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 89,522 83,182  
Operating Segment | Real Estate | Other      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 3,921 4,513  
Operating Segment | Real Estate | Sales of Goods and Real Estate and Service [Member]      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 398,294 441,113  
Operating Segment | Real Estate | Other Revenue      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers [1] 68,345 87,951  
Operating Segment | Investment and Operation      
Segment Reporting Information [Line Items]      
Segment revenues /Total revenues 451,197 615,151 1,083,505
Operating Segment | Investment and Operation | Sales of Goods      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 266,271 436,044  
Operating Segment | Investment and Operation | Real Estate Sales      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0  
Operating Segment | Investment and Operation | Asset Management and Servicing      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 383 454  
Operating Segment | Investment and Operation | Automobile related services      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 232 204  
Operating Segment | Investment and Operation | Facilities operation      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0  
Operating Segment | Investment and Operation | Environment and energy services      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 138,380 129,166  
Operating Segment | Investment and Operation | Real estate management and brokerage      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0  
Operating Segment | Investment and Operation | Real estate contract work      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0  
Operating Segment | Investment and Operation | Other      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 34,942 39,081  
Operating Segment | Investment and Operation | Sales of Goods and Real Estate and Service [Member]      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 440,208 604,949  
Operating Segment | Investment and Operation | Other Revenue      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers [1] 10,989 10,202  
Operating Segment | Retail      
Segment Reporting Information [Line Items]      
Segment revenues /Total revenues 454,751 428,904 428,697
Operating Segment | Retail | Sales of Goods      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0  
Operating Segment | Retail | Real Estate Sales      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0  
Operating Segment | Retail | Asset Management and Servicing      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 167 163  
Operating Segment | Retail | Automobile related services      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0  
Operating Segment | Retail | Facilities operation      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0  
Operating Segment | Retail | Environment and energy services      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0  
Operating Segment | Retail | Real estate management and brokerage      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0  
Operating Segment | Retail | Real estate contract work      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0  
Operating Segment | Retail | Other      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 4,147 3,448  
Operating Segment | Retail | Sales of Goods and Real Estate and Service [Member]      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 4,314 3,611  
Operating Segment | Retail | Other Revenue      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers [1] 450,437 425,293  
Operating Segment | Overseas Business      
Segment Reporting Information [Line Items]      
Segment revenues /Total revenues 486,328 490,730 ¥ 479,619
Operating Segment | Overseas Business | Sales of Goods      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 4,131 6,798  
Operating Segment | Overseas Business | Real Estate Sales      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 984 710  
Operating Segment | Overseas Business | Asset Management and Servicing      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 173,948 185,787  
Operating Segment | Overseas Business | Automobile related services      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 16,950 16,994  
Operating Segment | Overseas Business | Facilities operation      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 363 3,066  
Operating Segment | Overseas Business | Environment and energy services      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 963 1,004  
Operating Segment | Overseas Business | Real estate management and brokerage      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0  
Operating Segment | Overseas Business | Real estate contract work      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0  
Operating Segment | Overseas Business | Other      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 17,313 20,544  
Operating Segment | Overseas Business | Sales of Goods and Real Estate and Service [Member]      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 214,652 234,903  
Operating Segment | Overseas Business | Other Revenue      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers [1] 271,676 255,827  
Operating Segment | Japan      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 966,720 1,174,678  
Operating Segment | Japan | Corporate Financial Services      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 45,446 43,638  
Operating Segment | Japan | Maintenance Leasing      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 76,462 75,610  
Operating Segment | Japan | Real Estate      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 398,294 441,113  
Operating Segment | Japan | Investment and Operation      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 436,500 603,957  
Operating Segment | Japan | Retail      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 4,314 3,611  
Operating Segment | Japan | Overseas Business      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 5,704 6,749  
Operating Segment | The Americas      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 99,979 114,614  
Operating Segment | The Americas | Corporate Financial Services      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0  
Operating Segment | The Americas | Maintenance Leasing      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0  
Operating Segment | The Americas | Real Estate      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0  
Operating Segment | The Americas | Investment and Operation      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0  
Operating Segment | The Americas | Retail      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0  
Operating Segment | The Americas | Overseas Business      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 99,979 114,614  
Operating Segment | Other Countries      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 113,378 114,865  
Operating Segment | Other Countries | Corporate Financial Services      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0  
Operating Segment | Other Countries | Maintenance Leasing      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 701 333  
Operating Segment | Other Countries | Real Estate      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0  
Operating Segment | Other Countries | Investment and Operation      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 3,708 992  
Operating Segment | Other Countries | Retail      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0  
Operating Segment | Other Countries | Overseas Business      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 108,969 113,540  
Corporate And Intersegment Eliminations [Member]      
Segment Reporting Information [Line Items]      
Segment revenues /Total revenues (12,031) (12,408)  
Corporate And Intersegment Eliminations [Member] | Sales of Goods      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 1,359 1,353  
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 (100) (107)  
Corporate And Intersegment Eliminations [Member] | Automobile related services      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers (387) (359)  
Corporate And Intersegment Eliminations [Member] | Facilities operation      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 (1)  
Corporate And Intersegment Eliminations [Member] | Environment and energy services      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers (722) (930)  
Corporate And Intersegment Eliminations [Member] | Real estate management and brokerage      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers (2,124) (2,216)  
Corporate And Intersegment Eliminations [Member] | Real estate contract work      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers (556) (965)  
Corporate And Intersegment Eliminations [Member] | Other      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers (3,234) (5,356)  
Corporate And Intersegment Eliminations [Member] | Sales of Goods and Real Estate and Service [Member]      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers (5,764) (8,581)  
Corporate And Intersegment Eliminations [Member] | Other Revenue      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers [1] (6,267) (3,827)  
Corporate And Intersegment Eliminations [Member] | Japan      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers (2,079) (4,886)  
Corporate And Intersegment Eliminations [Member] | The Americas      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0  
Corporate And Intersegment Eliminations [Member] | Other Countries      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers ¥ (3,685) ¥ (3,695)  
[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.