Goodwill and Other Intangible Assets (Changes in Goodwill by Reportable Segment) (Detail) - JPY (¥) ¥ in Millions |
12 Months Ended | |||||
|---|---|---|---|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
Mar. 31, 2024 |
Mar. 31, 2023 |
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| Goodwill [Line Items] | ||||||
| Acquired | ¥ 150,974 | ¥ 9,081 | ¥ 4,241 | |||
| Impairment | (53,016) | (6,695) | 0 | |||
| Other (net) | [1] | 53,776 | (12,298) | (154) | ||
| Goodwill, Gross | 835,430 | 632,454 | 638,086 | ¥ 633,999 | ||
| Accumulated impairment losses | (61,838) | (10,596) | (6,316) | (6,316) | ||
| Goodwill | ¥ 773,592 | ¥ 621,858 | ¥ 631,770 | 627,683 | ||
| Goodwill, Impairment Loss, Statement of Income or Comprehensive Income [Extensible Enumeration] | Other Operating Income (Expense), Net | Other Operating Income (Expense), Net | Other Operating Income (Expense), Net | |||
| Corporate Financial Services and Maintenance Leasing | ||||||
| Goodwill [Line Items] | ||||||
| Acquired | ¥ 0 | ¥ 31 | ¥ 0 | |||
| Impairment | 0 | 0 | 0 | |||
| Other (net) | [1] | (168) | (1,699) | (54) | ||
| Goodwill, Gross | 13,502 | 13,682 | 15,900 | 15,954 | ||
| Accumulated impairment losses | (287) | (299) | (849) | (849) | ||
| Goodwill | 13,215 | 13,383 | 15,051 | 15,105 | ||
| Real Estate Segment | ||||||
| Goodwill [Line Items] | ||||||
| Acquired | 0 | 0 | 0 | |||
| Impairment | 0 | 0 | 0 | |||
| Other (net) | [1] | 0 | 0 | 0 | ||
| Goodwill, Gross | 16,359 | 16,359 | 16,359 | 16,359 | ||
| Accumulated impairment losses | (191) | (191) | (191) | (191) | ||
| Goodwill | 16,168 | 16,168 | 16,168 | 16,168 | ||
| PE Investment and Concession | ||||||
| Goodwill [Line Items] | ||||||
| Acquired | 15,487 | 7,849 | 4,241 | |||
| Impairment | 0 | (5,520) | 0 | |||
| Other (net) | [1] | 313 | (10,623) | (35,556) | ||
| Goodwill, Gross | 188,462 | 172,662 | 175,436 | 206,751 | ||
| Accumulated impairment losses | (5,520) | (5,520) | 0 | 0 | ||
| Goodwill | 182,942 | 167,142 | 175,436 | 206,751 | ||
| Environment and Energy | ||||||
| Goodwill [Line Items] | ||||||
| Acquired | 185 | 0 | 0 | |||
| Impairment | 0 | 0 | 0 | |||
| Other (net) | [1] | 8,014 | 3,220 | 6,840 | ||
| Goodwill, Gross | 76,466 | 68,267 | 65,047 | 58,207 | ||
| Accumulated impairment losses | (39) | (39) | (39) | (39) | ||
| Goodwill | 76,427 | 68,228 | 65,008 | 58,168 | ||
| Insurance | ||||||
| Goodwill [Line Items] | ||||||
| Acquired | 0 | 0 | 0 | |||
| Impairment | 0 | 0 | 0 | |||
| Other (net) | [1] | 0 | 0 | (192) | ||
| Goodwill, Gross | 4,452 | 4,452 | 4,823 | 5,015 | ||
| Accumulated impairment losses | 0 | 0 | (371) | (371) | ||
| Goodwill | 4,452 | 4,452 | 4,452 | 4,644 | ||
| Banking and Credit | ||||||
| Goodwill [Line Items] | ||||||
| Acquired | 0 | 0 | 0 | |||
| Impairment | 0 | 0 | 0 | |||
| Other (net) | [1] | 0 | 0 | (10,971) | ||
| Goodwill, Gross | 0 | 0 | 0 | 10,971 | ||
| Accumulated impairment losses | 0 | 0 | 0 | 0 | ||
| Goodwill | 0 | 0 | 0 | 10,971 | ||
| Aircraft and Ships | ||||||
| Goodwill [Line Items] | ||||||
| Acquired | 0 | 1,201 | 0 | |||
| Impairment | 0 | 0 | 0 | |||
| Other (net) | [1] | 326 | 0 | 0 | ||
| Goodwill, Gross | 1,527 | 1,788 | 587 | 587 | ||
| Accumulated impairment losses | 0 | (587) | (587) | (587) | ||
| Goodwill | 1,527 | 1,201 | 0 | 0 | ||
| ORIX USA | ||||||
| Goodwill [Line Items] | ||||||
| Acquired | 135,302 | 0 | 0 | |||
| Impairment | (52,738) | (1,175) | 0 | |||
| Other (net) | [1] | 22,517 | (2,146) | 20,298 | ||
| Goodwill, Gross | 326,378 | 169,734 | 173,374 | 153,076 | ||
| Accumulated impairment losses | (52,738) | (1,175) | (1,494) | (1,494) | ||
| Goodwill | 273,640 | 168,559 | 171,880 | 151,582 | ||
| ORIX Europe | ||||||
| Goodwill [Line Items] | ||||||
| Acquired | 0 | 0 | 0 | |||
| Impairment | 0 | 0 | 0 | |||
| Other (net) | [1] | 22,499 | (907) | 18,927 | ||
| Goodwill, Gross | 199,107 | 176,608 | 177,515 | 158,588 | ||
| Accumulated impairment losses | 0 | 0 | 0 | 0 | ||
| Goodwill | 199,107 | 176,608 | 177,515 | 158,588 | ||
| Asia and Australia | ||||||
| Goodwill [Line Items] | ||||||
| Acquired | 0 | 0 | 0 | |||
| Impairment | 0 | 0 | 0 | |||
| Other (net) | [1] | 275 | (143) | 554 | ||
| Goodwill, Gross | 8,899 | 8,624 | 8,767 | 8,213 | ||
| Accumulated impairment losses | (2,785) | (2,785) | (2,785) | (2,785) | ||
| Goodwill | 6,114 | 5,839 | 5,982 | 5,428 | ||
| Corporate | ||||||
| Goodwill [Line Items] | ||||||
| Acquired | 0 | 0 | 0 | |||
| Impairment | (278) | 0 | 0 | |||
| Other (net) | [1] | 0 | 0 | 0 | ||
| Goodwill, Gross | 278 | 278 | 278 | 278 | ||
| Accumulated impairment losses | (278) | 0 | 0 | 0 | ||
| Goodwill | ¥ 0 | ¥ 278 | ¥ 278 | ¥ 278 | ||
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