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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 | 12 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Mar. 31, 2021
Interest rate swap agreements |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (losses) recognized in other comprehensive income on derivative | ¥ 23,838 | ¥ 16,507 | ¥ 5,051
Interest rate swap agreements | Interest expense |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (losses) reclassified from other comprehensive income (loss) into income | 175 | 1,615 | 1,522
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 | 0
Foreign exchange contracts |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (losses) recognized in other comprehensive income on derivative | (184) | (542) | (45)
Foreign exchange contracts | Interest expense |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (losses) reclassified from other comprehensive income (loss) into income | (893) | 223 | 827
Foreign exchange contracts | Other (income) and expense |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (losses) reclassified from other comprehensive income (loss) into income | 893 | 487 | (585)
Foreign currency swap agreements |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (losses) recognized in other comprehensive income on derivative | (2,268) | (2,075) | (6,043)
Foreign currency swap agreements | Interest expense |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (losses) reclassified from other comprehensive income (loss) into income | 766 | 559 | 553
Foreign currency swap agreements | Other (income) and expense |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (losses) reclassified from other comprehensive income (loss) into income | 905 | ¥ 3,030 | ¥ 5,385
Options held/written and other |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (losses) recognized in other comprehensive income on derivative | (48) |  |
Options held/written and other | Interest expense |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (losses) reclassified from other comprehensive income (loss) into income | 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 |  |

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- Definition Amount, before tax and reclassification, of gain (loss) from derivative instrument designated and qualifying cash flow hedge included in assessment of hedge effectiveness. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 20 -Section 45 -Paragraph 3 -URI https://asc.fasb.org/extlink&oid=121577181&loc=SL110061190-113977 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b)(2) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5618551-113959 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5624171-113959 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI https://asc.fasb.org/extlink&oid=126968391&loc=d3e637-108580 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=126968391&loc=SL7669646-108580 + Details
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