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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.