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Derivative Financial Instruments and Hedging (Effect of Derivative Instruments on Consolidated Statements of Income, Pre-tax, Cash flow hedges) (Detail) - Derivatives designated as hedging instruments - Cash flow hedges - JPY (¥) ¥ in Millions | 6 Months Ended
--- | ---
Sep. 30, 2025 | Sep. 30, 2024
Interest rate swap agreements |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gains (losses) recognized in other comprehensive income on derivative | ¥ (2,575) | ¥ (7,712)
Interest rate swap agreements | Life insurance premiums and related investment income |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gains (losses) reclassified from other comprehensive income (loss) into income | 0 | 0
Interest rate swap agreements | Interest expense |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gains (losses) reclassified from other comprehensive income (loss) into income | (121) | (68)
Interest rate swap agreements | Other (income) and expense |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gains (losses) reclassified from other comprehensive income (loss) into income | 0 | 0
Foreign exchange contracts |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gains (losses) recognized in other comprehensive income on derivative | 298 | (803)
Foreign exchange contracts | Life insurance premiums and related investment income |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gains (losses) reclassified from other comprehensive income (loss) into income | 0 | 0
Foreign exchange contracts | Interest expense |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gains (losses) reclassified from other comprehensive income (loss) into income | 945 | 0
Foreign exchange contracts | Other (income) and expense |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gains (losses) reclassified from other comprehensive income (loss) into income | (4,017) | 0
Foreign currency swap agreements |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gains (losses) recognized in other comprehensive income on derivative | 5,174 | (4,906)
Foreign currency swap agreements | Life insurance premiums and related investment income |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gains (losses) reclassified from other comprehensive income (loss) into income | 0 | 0
Foreign currency swap agreements | Interest expense |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gains (losses) reclassified from other comprehensive income (loss) into income | 1,124 | 1,584
Foreign currency swap agreements | Other (income) and expense |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gains (losses) reclassified from other comprehensive income (loss) into income | (2,906) | 4,710
Options held/written and other |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gains (losses) recognized in other comprehensive income on derivative | (6,469) | (2,193)
Options held/written and other | Life insurance premiums and related investment income |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gains (losses) reclassified from other comprehensive income (loss) into income | 50 | 4
Options held/written and other | Interest expense |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gains (losses) reclassified from other comprehensive income (loss) into income | 0 | 0
Options held/written and other | Other (income) and expense |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gains (losses) reclassified from other comprehensive income (loss) into income | ¥ 0 | ¥ 0

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