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Recorded Amounts of Major Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Parenthetical) (Detail) (JPY ¥) In Millions, unless otherwise specified	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gains (losses) from change in fair value	¥ 333
Aggregate unpaid loan principal balance	12,024	15,535
Aggregate loan fair value	12,631	16,026
Amount by which aggregate fair value of loan exceeds aggregate unpaid principal balance	607	491
Investment funds fair value	11,433	5,800
Loans Held-for-Sale
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gains (losses) from change in fair value	116	(628)	1,024
Available-for-sale securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investment funds fair value	5,116
Other securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investment funds fair value	6,317	5,800
Investments
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gains (losses) from change in fair value	¥ 1,412	¥ 670

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- Definition

Loans Held for Sale Excess Fair Value Over Unpaid Principal Balance

+ References

No definition available.

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- Definition

For each line item in the statement of financial position, the amounts of gains and losses from fair value changes included in earnings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 30

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612

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- Definition

Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Available-for-Sale Securities

-URI http://asc.fasb.org/extlink&oid=6505594



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Trading Securities

-URI http://asc.fasb.org/extlink&oid=6526789



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Subparagraph a, f, g

-Article 7



Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 35

-Paragraph 1

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Fair value portion of loans held-for-sale including, but not limited to, mortgage loans and finance receivables.

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The face amount of loans that will be sold to other entities.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522

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