Fair Value Measurements - Additional Information (Detail) (USD $)	12 Months Ended
	Sep. 30, 2013 Loans	Sep. 30, 2012	Sep. 30, 2011
Fair Value Disclosures [Abstract]
Number of impaired loans	233
Impaired loans, carrying value	$ 37,200,000
Impaired loans, valuation allowance	819,000
Impaired loans, net fair value	36,400,000
Fair value consists of the loan receivable	951,120,000	997,685,000
Impaired financing valuation allowances	$ 819,000	$ 952,000	$ 1,160,000