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Accumulated Other Comprehensive Income (Loss) (Amounts Reclassified to Net Income from Accumulated Other Comprehensive Income (loss)) (Detail) - JPY (¥) ¥ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2023
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Life insurance costs | ¥ (384,753) | ¥ (433,863) | ¥ (373,906)
Interest expense | (169,051) | (188,328) | (127,618)
Income tax (expense) or benefit | (128,828) | (131,388) | (95,245)
Net Income | 351,635 | 338,587 | 296,933
Reclassification adjustment included in net income | Net unrealized gains (losses) on investment in securities |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Total before income tax | 497 | (2,089) | 511
Income tax (expense) or benefit | 347 | 749 | (90)
Net Income | 844 | (1,340) | 421
Reclassification adjustment included in net income | Net unrealized gains (losses) on investment in securities | Sales of debt securities |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Gains on investment securities and dividend | 1,004 | 231 | 155
Life insurance premiums and related investment income | (9,010) | (7,184) | (765)
Reclassification adjustment included in net income | Net unrealized gains (losses) on investment in securities | Amortization of debt securities |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Finance revenues | 1,732 | 756 | 509
Life insurance premiums and related investment income | 6,771 | 4,108 | 1,148
Reclassification adjustment included in net income | Net unrealized gains (losses) on investment in securities | Others |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Write-downs of securities and other |  |  | (536)
Reclassification adjustment included in net income | Debt valuation adjustments |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Life insurance costs | 4 | 19 | 18
Total before income tax | 4 | 19 | 18
Income tax (expense) or benefit | (1) | (5) | (5)
Net Income | 3 | 14 | 13
Reclassification adjustment included in net income | Defined benefit pension plans |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Amortization of prior service credit | 394 | 438 | 376
Amortization of net actuarial loss | 84 | (70) | (88)
Amortization of transition obligation | (1) | (1) | (1)
Settlements | 148 |  |
Total before income tax | 625 | 367 | 287
Income tax (expense) or benefit | (181) | (101) | (76)
Net Income | 444 | 266 | 211
Reclassification adjustment included in net income | Foreign currency translation adjustments |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Gains on sales of subsidiaries and equity method investments and liquidation losses, net | 903 | 109 | 8,776
Total before income tax | (25,689) | (14,843) | (5,897)
Income tax (expense) or benefit | 7,963 | 4,601 | 1,806
Net Income | (17,726) | (10,242) | (4,091)
Reclassification adjustment included in net income | Foreign currency translation adjustments | Foreign exchange contracts |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Gains on sales of subsidiaries and equity method investments and liquidation losses, net/Interest expense/Other (income) and expense | (26,592) | (14,952) | (14,673)
Reclassification adjustment included in net income | Net unrealized gains (losses) on derivative instruments |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Total before income tax | (11,501) | 3,892 | (1,846)
Income tax (expense) or benefit | 2,635 | (945) | 408
Net Income | (8,866) | 2,947 | (1,438)
Reclassification adjustment included in net income | Net unrealized gains (losses) on derivative instruments | Interest rate swap agreements |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Interest expense | 446 | 114 | (175)
Reclassification adjustment included in net income | Net unrealized gains (losses) on derivative instruments | Foreign exchange contracts |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Interest expense | (694) |  |
Interest expense /Other (income) and expense |  |  | 0
Reclassification adjustment included in net income | Net unrealized gains (losses) on derivative instruments | Foreign currency swap agreements |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Interest expense /Other (income) and expense | (11,239) | ¥ 3,778 | ¥ (1,671)
Reclassification adjustment included in net income | Net unrealized gains (losses) on derivative instruments | Options held/written and other |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Life insurance premiums and related investment income | ¥ (14) |  |

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