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Investment in Operating Leases - Additional Information (Detail) In Millions | 12 Months Ended
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Mar. 31, 2011 USD ($) | Mar. 31, 2011 JPY (¥) | Mar. 31, 2010 JPY (¥) | Mar. 31, 2009 JPY (¥)
Schedule of Operating Leases [Line Items] |  |  |  |
Gains on sales of operating lease assets other than real estate | $ 120 | ¥ 9,968 | ¥ 7,552 | ¥ 11,426
Operating lease contracts, non-cancelable lease terms | up to 20 years | up to 20 years |  |

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- Definition Operating Lease Contracts, Noncancelable Lease Terms + Details
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- Definition Schedule of Operating Leases [Line Items] + Details
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- Definition The net gain or loss arising from the lessor's sale of assets held- or available-for-lease under contractual arrangements classified as operating leases. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 13 -Paragraph 20, 21 + Details
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