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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)