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Accumulated Other Comprehensive Income (Loss) (Changes in Components of Accumulated Other Comprehensive Income (Loss)) (Parenthetical) (Detail) - JPY (¥) ¥ in Millions |  |  |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | --- | ---
Mar. 31, 2023 | Jun. 30, 2022 | Mar. 31, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Other Comprehensive Income (Loss), Net of Tax |  |  |  | ¥ 75,139 | ¥ 98,522 | ¥ 175,943 | ¥ 218,869
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest |  |  |  | 66,483 | 61,793 | 130,640 | 126,143
Income Tax Expense (Benefit) |  |  |  | 28,592 | 18,767 | 53,827 | 39,981
Net unrealized gains (losses) on investments, net of tax |  |  |  | (128) | 0 | (128) | 0
Net unrealized gains (losses) on investments |  |  |  | 21 |  | 21 |
Cumulative Effect, Period of Adoption, Adjusted Balance | Effect of Modified Retrospective Application Accounting Standards Update 2018-12 |  |  |  |  |  |  |
Other Comprehensive Income (Loss), Net of Tax | ¥ (24,641) | ¥ (24,641) | ¥ (24,641) |  |  |  |
Other Comprehensive Income (Loss), Tax | 4,296 | 4,296 | 4,296 |  |  |  |
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest | 189,157 | 139,027 | 62,176 |  |  |  |
Income Tax Expense (Benefit) | ¥ (66,702) | ¥ (52,893) | ¥ (23,125) |  |  |  |
Net unrealized gains (losses) on investment in securities |  |  |  |  |  |  |
Net unrealized gains (losses), tax |  |  |  | 36,198 | 23,591 | 35,524 | 54,025
Reclassification adjustment included in net income, tax |  |  |  | 353 | 10 | 1,211 | 292
Other Comprehensive Income (Loss), Net of Tax |  |  |  | (99,262) | (62,494) | (100,412) | (143,867)
Impact of changes in policy liability discount rate |  |  |  |  |  |  |
Net unrealized gains (losses), tax |  |  |  | (36,613) | (31,968) | (38,745) | (61,736)
Other Comprehensive Income (Loss), Net of Tax |  |  |  | 106,057 | 82,515 | 110,576 | 159,366
Debt valuation adjustments |  |  |  |  |  |  |
Net unrealized gains (losses), tax |  |  |  | 30 | (31) | 43 | (25)
Reclassification adjustment included in net income, tax |  |  |  | 0 | 1 | 3 | 2
Other Comprehensive Income (Loss), Net of Tax |  |  |  | (79) | 76 | (123) | 60
Defined benefit pension plans |  |  |  |  |  |  |
Net unrealized gains (losses), tax |  |  |  | 59 | 45 | (19) | 81
Reclassification adjustment included in net income, tax |  |  |  | 25 | 17 | 52 | 33
Other Comprehensive Income (Loss), Net of Tax |  |  |  | (236) | (151) | (89) | (316)
Foreign currency translation adjustments |  |  |  |  |  |  |
Net unrealized gains (losses), tax |  |  |  | 39 | 3,827 | 22,732 | 27,143
Reclassification adjustment included in net income, tax |  |  |  | (1,014) | (3) | (2,328) | (12)
Other Comprehensive Income (Loss), Net of Tax |  |  |  | 64,265 | 70,976 | 163,583 | 185,095
Net unrealized gains (losses) on derivative instruments |  |  |  |  |  |  |
Net unrealized gains (losses), tax |  |  |  | 93 | (3,069) | (2,072) | (4,707)
Reclassification adjustment included in net income, tax |  |  |  | ¥ (169) | ¥ 399 | ¥ 1,289 | ¥ (436)

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