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Credit Quality of Financing Receivables and the Allowance for Credit losses - Additional Information (Detail) (JPY ¥) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended		12 Months Ended
	Dec. 31, 2011		Dec. 31, 2011		Mar. 31, 2011
Financing Receivable, Allowance for Credit Losses [Line Items]
Average recorded investments in impaired loans	¥ 288,545	[1]	¥ 296,159	[1]	¥ 368,539
Recognition of interest income on impaired loans	1,189		4,078		4,225
Interest received in cash on impaired loans	¥ 1,084		¥ 3,394		¥ 3,592
[1] Average balances are calculated on the basis of fiscal beginning and quarter-end balances.

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- Definition

Loans and Leases Receivable, Impaired, Interest Income

+ References

No definition available.

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- Definition

Reflects the average recorded investment in impaired loans during each period.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 114

-Paragraph 20

-Subparagraph c

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- Definition

Reflects the amount of interest income on impaired and nonperforming loans that was recognized as income during the reporting period.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 114

-Paragraph 20



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

-Publisher OTS

-Name Federal Regulation (FR)

-Number Title 12

-Chapter V

-Section 563c.102

-Paragraph 8

-Subparagraph j(ii)

-Subsection I



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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 15

-Paragraph 40

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