Lines of Credit (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 2.5	$ 2.5
Interest rate terms	Prime plus 1% to London Inter-Bank Offer Rate (“LIBOR”) plus 2.5%, with a floor of 4%	Prime plus 1% to London Inter-Bank Offer Rate (“LIBOR”) plus 2.5%, with a floor of 4%
Amount outstanding	$ 2.4	$ 3.1
Line of Credit
Line of Credit Facility [Line Items]
Stated interest rate, percentage, minimum	4.00%	4.00%
Line of Credit | Prime Rate
Line of Credit Facility [Line Items]
Basis spread on variable rate	1.00%	1.00%
Line of Credit | London Interbank Offered Rate (LIBOR)
Line of Credit Facility [Line Items]
Basis spread on variable rate	2.50%	2.50%