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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
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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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- Definition 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. + Details
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- Definition The balance of financing receivables that were individually evaluated for impairment. + Details
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- Definition Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date. + Details
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- Definition Amount of allowance for credit losses related to recorded investment. + Details
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- Definition Loans and Leases Receivable, Impaired, Interest Income + Details
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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 + Details
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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 + Details
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