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Accumulated Other Comprehensive Income (Loss) (Amounts Reclassified to Net Income from Accumulated Other Comprehensive Income (loss)) (Detail) - JPY (¥) ¥ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Gains on sales of subsidiaries and affiliates and liquidation losses, net | ¥ 2,673 | ¥ 5,486 | ¥ 3,628 | ¥ 8,589
Life insurance costs | (102,377) | (119,698) | (222,097) | (220,715)
Interest expense | (47,810) | (29,575) | (90,891) | (51,473)
Income tax (expense) or benefit | (28,592) | (18,767) | (53,827) | (39,981)
Net Income | 66,483 | 61,793 | 130,640 | 126,143
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 | 1,450 | 108 | 4,639 | 1,164
Income tax (expense) or benefit | (353) | (10) | (1,211) | (292)
Net Income | 1,097 | 98 | 3,428 | 872
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 dividends | 42 | 1 | 131 | 17
Life insurance premiums and related investment income | 269 | (143) | 2,305 | 811
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 | 110 | 50 | 313 | 162
Life insurance premiums and related investment income | 1,029 | 200 | 1,890 | 174
Reclassification adjustment included in net income | Debt valuation adjustments |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Life insurance costs | 4 | 5 | 12 | 8
Total before income tax | 4 | 5 | 12 | 8
Income tax (expense) or benefit | 0 | (1) | (3) | (2)
Net Income | 4 | 4 | 9 | 6
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 | 111 | 86 | 225 | 170
Amortization of net actuarial loss | (20) | (22) | (32) | (45)
Amortization of transition obligation | (1) | (1) | (1) | (1)
Total before income tax | 90 | 63 | 192 | 124
Income tax (expense) or benefit | (25) | (17) | (52) | (33)
Net Income | 65 | 46 | 140 | 91
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 affiliates and liquidation losses, net | 45 | 1,156 | 125 | 1,539
Total before income tax | (3,271) | (15) | (7,511) | (114)
Income tax (expense) or benefit | 1,014 | 3 | 2,328 | 12
Net Income | (2,257) | (12) | (5,183) | (102)
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 affiliates and liquidation losses, net/Interest expense/Other (income) and expense | (3,316) | (1,171) | (7,636) | (1,653)
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 | (780) | 1,562 | 5,504 | (1,885)
Income tax (expense) or benefit | 169 | (399) | (1,289) | 436
Net Income | (611) | 1,163 | 4,215 | (1,449)
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 | 7 | 63 | (30) | (157)
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 |  | (84) |  | (164)
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 | ¥ (787) | ¥ 1,583 | ¥ 5,534 | ¥ (1,564)

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