Summary of Non-Vested Stock Option Awards (Detail) (USD $)	12 Months Ended
	Sep. 30, 2013
Schedule Of Stock Options [Line Items]
Nonvested option awards outstanding September 30, 2012, Number of Nonvested share Awards	37,750
Vested, Number of Nonvested share Awards	(37,750)
Nonvested option awards outstanding September 30, 2013, Number of Nonvested share Awards
Nonvested option awards outstanding September 30, 2012, Weighted Average Grant Date Fair Value	$ 9.59
Vested, Weighted Average Grant Date Fair Value	$ 9.59
Nonvested option awards outstanding September 30, 2013, Weighted Average Grant Date Fair Value