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Effect of Derivative Instruments on Consolidated Statements of Income, Pre-tax (Detail) (JPY ¥) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Mar. 31, 2014 | Mar. 31, 2013 | Mar. 31, 2012
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (losses) recognized in income on derivative |  | ¥ (370) | ¥ (1,188)
Cash flow hedges | Interest rate swap agreements |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (losses) recognized in other comprehensive income on derivative (effective portion) | 945 | (249) | (489)
Gains (losses) recognized in income on derivative (ineffective portion and amount excluded from effectiveness testing) | 0 | 0 | 0
Cash flow hedges | Interest rate swap agreements | Interest on loans and investment securities/Interest expense |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (losses) reclassified from accumulated other comprehensive income (loss) into income (effective portion) | 39 | 6 | 44
Cash flow hedges | Foreign exchange contracts |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (losses) recognized in other comprehensive income on derivative (effective portion) | (948) | (1,546) | (526)
Gains (losses) recognized in income on derivative (ineffective portion and amount excluded from effectiveness testing) | 0 | 0 | 0
Cash flow hedges | Foreign exchange contracts | Foreign currency transaction loss |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (losses) reclassified from accumulated other comprehensive income (loss) into income (effective portion) | 773 | 73 | (696)
Cash flow hedges | Foreign currency swap agreements |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (losses) recognized in other comprehensive income on derivative (effective portion) | 594 | 960 | (409)
Gains (losses) recognized in income on derivative (ineffective portion and amount excluded from effectiveness testing) |  |  | 0
Cash flow hedges | Foreign currency swap agreements | Foreign currency transaction loss |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (losses) recognized in income on derivative (ineffective portion and amount excluded from effectiveness testing) | 269 | (69) |
Cash flow hedges | Foreign currency swap agreements | Interest on loans and investment securities/Interest expense/Foreign currency transaction loss |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (losses) reclassified from accumulated other comprehensive income (loss) into income (effective portion) | (2,025) | (1,231) | 1,031
Fair value hedges | Interest rate swap agreements | Interest on loans and investment securities/Interest expense |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (losses) recognized in income on derivative | (2,296) | 76 | 4,072
Gains (losses) recognized in income on hedged item | 2,276 | (120) | (4,337)
Fair value hedges | Foreign exchange contracts | Foreign currency transaction loss |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (losses) recognized in income on derivative | (3,574) | (8,828) | 972
Gains (losses) recognized in income on hedged item | 3,574 | 8,828 | (972)
Fair value hedges | Foreign currency swap agreements | Foreign currency transaction loss |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (losses) recognized in income on derivative | (2,896) | (2,352) | 227
Gains (losses) recognized in income on hedged item | 2,896 | 2,349 | (277)
Fair value hedges | Foreign Exchange Long Term Debt | Foreign currency transaction loss |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (losses) recognized in income on derivative | (1,609) | 172 | 69
Gains (losses) recognized in income on hedged item | 1,609 | (172) | (69)
Hedges of net investment in foreign operations | Foreign exchange contracts |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (losses) recognized in other comprehensive income on derivative (effective portion) | (23,638) | (11,524) | (1,198)
Gains (losses) reclassified from accumulated other comprehensive income (loss) into income (effective portion) |  |  | 0
Gains (losses) recognized in income on derivative (ineffective portion and amount excluded from effectiveness testing) | 0 | 0 | 0
Hedges of net investment in foreign operations | Foreign exchange contracts | Gains (losses) on sales of subsidiaries and affiliates and liquidation losses, net |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (losses) reclassified from accumulated other comprehensive income (loss) into income (effective portion) | (171) | 1,425 |
Hedges of net investment in foreign operations | Debt Loans and Bonds in Local Currency |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (losses) recognized in other comprehensive income on derivative (effective portion) | (16,469) | (19,637) | 1,348
Gains (losses) reclassified from accumulated other comprehensive income (loss) into income (effective portion) | 0 |  | 0
Gains (losses) recognized in income on derivative (ineffective portion and amount excluded from effectiveness testing) | 0 | 0 | 0
Hedges of net investment in foreign operations | Debt Loans and Bonds in Local Currency | Gains (losses) on sales of subsidiaries and affiliates and liquidation losses, net |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (losses) reclassified from accumulated other comprehensive income (loss) into income (effective portion) |  | 3,464 |
Trading derivatives or derivatives not designated as hedging instruments | Interest rate swap agreements | Other operating revenues/expenses |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (losses) recognized in income on derivative | 5 | 8 | 23
Trading derivatives or derivatives not designated as hedging instruments | Foreign exchange contracts | Brokerage commissions and net gains (losses) on investment securities |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (losses) recognized in income on derivative | (406) | (236) | 615
Trading derivatives or derivatives not designated as hedging instruments | Foreign currency swap agreements | Other operating revenues/expenses |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (losses) recognized in income on derivative |  |  | 24
Trading derivatives or derivatives not designated as hedging instruments | Future | Brokerage commissions and net gains (losses) on investment securities |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (losses) recognized in income on derivative | (167) | (504) | (1,056)
Trading derivatives or derivatives not designated as hedging instruments | Credit derivatives held/written | Other operating revenues/expenses |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (losses) recognized in income on derivative | (506) | 344 | (92)
Trading derivatives or derivatives not designated as hedging instruments | Options Held (Written) and Other | Other operating revenues/expenses |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (losses) recognized in income on derivative | ¥ (241) | ¥ 992 | ¥ 137

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 + Details
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- Definition The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4D -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624177-113959 + Details
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- Definition The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1),(2) -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 + Details
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- Definition The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 + Details
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