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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, 2024 | Mar. 31, 2023 | Mar. 31, 2022
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Life insurance costs | ¥ (433,863) | ¥ (373,906) | ¥ (363,569)
Interest expense | (188,328) | (127,618) | (68,232)
Income tax (expense) or benefit | (131,388) | (95,245) | (186,594)
Net Income | 338,587 | 296,933 | 322,853
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 | (2,089) | 511 | 4,268
Income tax (expense) or benefit | 749 | (90) | (61)
Net Income | (1,340) | 421 | 4,207
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 | 231 | 155 | 4,619
Life insurance premiums and related investment income | (7,184) | (765) | 737
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 | 756 | 509 | 92
Life insurance premiums and related investment income | 4,108 | 1,148 | (658)
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) | (522)
Reclassification adjustment included in net income | Debt valuation adjustments |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Life insurance costs | 19 | 18 | 36
Total before income tax | 19 | 18 | 36
Income tax (expense) or benefit | (5) | (5) | (10)
Net Income | 14 | 13 | 26
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 | 438 | 376 | 386
Amortization of net actuarial loss | (70) | (88) | (912)
Amortization of transition obligation | (1) | (1) | (1)
Total before income tax | 367 | 287 | (527)
Income tax (expense) or benefit | (101) | (76) | 151
Net Income | 266 | 211 | (376)
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 | 109 | 8,776 | 873
Total before income tax | (14,843) | (5,897) | (909)
Income tax (expense) or benefit | 4,601 | 1,806 | 295
Net Income | (10,242) | (4,091) | (614)
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 | (14,952) | (14,673) | (1,782)
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 | 3,892 | (1,846) | (5,914)
Income tax (expense) or benefit | (945) | 408 | 1,478
Net Income | 2,947 | (1,438) | (4,436)
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 | 114 | (175) | (1,615)
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 /Other (income) and expense |  | 0 | (710)
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 | ¥ 3,778 | ¥ (1,671) | ¥ (3,589)

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