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Credit Quality of Financing Receivables and the Allowance for Credit losses - Additional Information (Detail) In Millions	12 Months Ended										12 Months Ended
	Mar. 31, 2011 USD ($)	Mar. 31, 2011 JPY (¥)	Mar. 31, 2010 JPY (¥)	Mar. 31, 2009 JPY (¥)	Mar. 31, 2011 Direct financing leases JPY (¥)	Mar. 31, 2011 Direct financing leases USD ($)	Mar. 31, 2010 Direct financing leases JPY (¥)	Mar. 31, 2011 Smaller Balance Homogeneous Loans USD ($)	Mar. 31, 2011 Smaller Balance Homogeneous Loans JPY (¥)	Mar. 31, 2010 Smaller Balance Homogeneous Loans JPY (¥)	Mar. 31, 2011 Impaired Financing Receivable with Related Allowance USD ($)		Mar. 31, 2011 Impaired Financing Receivable with Related Allowance JPY (¥)		Mar. 31, 2010 Impaired Financing Receivable with Related Allowance JPY (¥)
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans Individually Evaluated for Impairment	$ 3,753	¥ 312,031	¥ 348,143								$ 2,931	[1]	¥ 243,749	[1]	¥ 268,145
Related Allowance	1,170	97,323									1,170	[1]	97,323	[1]	100,255
Loans on non-accrual status	1,969	163,709			22,787	274	25,682	182	15,096	12,321
Average recorded investments in impaired loans	4,432	368,539	402,868	317,911
Recognition of interest income on impaired loans	51	4,225	7,875	15,482
Interest received in cash on impaired loans	$ 43	¥ 3,592	¥ 4,841	¥ 9,421
[1] "With an allowance recorded" represents impaired loans with the allowance for credit losses as all or a part of the amounts due are not considered to be collectible.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The balance of financing receivables that were individually evaluated for impairment.

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Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date.

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Amount of allowance for credit losses related to recorded investment.

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Loans and Leases Receivable, Impaired, Interest Income

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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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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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