Employee Benefits - Summary of Nonvested Options (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Schedule Of Nonvested Stock Option Activity [Line Items]
Nonvested beginning of period, Options	2,026
Granted, Options	66
Forfeitures, Options	(8)
Cancelled, Options	(351)
Nonvested end of period, Options	1,508	2,026
Granted, Weighted Average Grant Date Fair Value	$ 4.19	$ 4.68	$ 4.97
Nonvested [Member]
Schedule Of Nonvested Stock Option Activity [Line Items]
Nonvested beginning of period, Options	1,162
Granted, Options	66
Vested, Options	(88)
Forfeitures, Options	(8)
Cancelled, Options	(351)
Nonvested end of period, Options	781
Nonvested beginning of period, Weighted Average Grant Date Fair Value	$ 4.95
Granted, Weighted Average Grant Date Fair Value	$ 4.19
Vested, Weighted Average Grant Date Fair Value	$ 8.07
Forfeitures, Weighted Average Grant Date Fair Value	$ 5.11
Cancelled, Weighted Average Grant Date Fair Value	$ 4.66
Nonvested end of period, Weighted Average Grant Date Fair Value	$ 4.66