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Activity Related to Balances Outstanding Under Proprietary Loan Program (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2013
Mar. 31, 2012
Loans [Line Items]        
Balance at beginning of period     $ 42,880 $ 26,863
Loans extended     14,336 10,880
Interest accrued     1,860 1,314
Amounts collected and recognized (568) (409) (1,018) (730)
Amounts written off (1,469) (1,899) (2,456) (4,698)
Balance at end of period $ 55,602 $ 33,629 $ 55,602 $ 33,629