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Cash Flow Information - Additional Information (Detail) (JPY ¥) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Mar. 31, 2014 | Mar. 31, 2013 | Mar. 31, 2012
Schedule of Cash Flow, Supplemental [Line Items] |  |  |
Real estate under operating leases transferred from installment loans and investment in securities as a result of real estate collateral acquired from non-recourse loans | ¥ 50,820 | ¥ 49,396 | ¥ 90,398
Real estate under other assets transferred from installment loans and investment in securities as a result of real estate collateral acquired from non-recourse loans | 8,741 |  |
Assets decreased due to deconsolidation of VIEs | 155,918 | 33,847 |
Liabilities decreased due to deconsolidation of VIEs | 170,869 | 33,847 |
Conversion of convertible bond | ¥ 49,944 | ¥ 99,773 | ¥ 6

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