Stock-Based Compensation - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended		12 Months Ended		6 Months Ended					12 Months Ended	6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended			6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended	0 Months Ended		6 Months Ended		0 Months Ended	6 Months Ended	0 Months Ended	6 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Mar. 31, 2014	Mar. 31, 2015 Scenario, Forecast	Sep. 30, 2014 Employee Stock Option	Sep. 30, 2013 Employee Stock Option	Sep. 30, 2014 Restricted Stock	Sep. 30, 2013 Restricted Stock	Sep. 30, 2014 Black Scholes Based Option Pricing Model 2015 $4.61 Value Per Option	Mar. 31, 2015 Black Scholes Based Option Pricing Model 2015 $4.61 Value Per Option Scenario, Forecast	Sep. 30, 2014 Black Scholes Based Option Pricing Model 2015 $3.85 Value Per Option	Mar. 31, 2015 Black Scholes Based Option Pricing Model 2015 $3.85 Value Per Option Scenario, Forecast	Sep. 30, 2014 Black Scholes Based Option Pricing Model 2014 $3.03 Value Per Option	Mar. 31, 2014 Black Scholes Based Option Pricing Model 2014 $3.03 Value Per Option	Sep. 30, 2014 Black Scholes Based Option Pricing Model 2014 $3.01 Value Per Option	Mar. 31, 2014 Black Scholes Based Option Pricing Model 2014 $3.01 Value Per Option	Mar. 31, 2014 Monte Carlo Simulation	Mar. 31, 2015 Monte Carlo Simulation Scenario, Forecast	Sep. 30, 2014 Monte Carlo Simulation 2015 $3.05 Value Per Option	Mar. 31, 2015 Monte Carlo Simulation 2015 $3.05 Value Per Option Scenario, Forecast	Sep. 30, 2014 Monte Carlo Simulation 2015 $2.14 Value Per Option	Mar. 31, 2015 Monte Carlo Simulation 2015 $2.14 Value Per Option Scenario, Forecast	Sep. 30, 2014 Monte Carlo Simulation 2014 $1.90 Value Per Option	Mar. 31, 2014 Monte Carlo Simulation 2014 $1.90 Value Per Option	Sep. 30, 2014 Monte Carlo Simulation 2014 $1.71 Value Per Option	Mar. 31, 2014 Monte Carlo Simulation 2014 $1.71 Value Per Option	Jun. 16, 2014 Chief Financial Officer	Aug. 18, 2014 Vice President	Sep. 30, 2014 Maximum	Sep. 30, 2014 2012 Plan	Jul. 07, 2014 2012 Plan Chief Financial Officer	Sep. 30, 2014 2006 Plan	Jul. 07, 2014 2006 Plan Chief Financial Officer	Sep. 30, 2014 2004 Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense, net of tax	$ 179	$ 108	$ 377	$ 217
Stock-based compensation expense, net of tax, per diluted share	$ 0.02	$ 0.01	$ 0.04	$ 0.02
Shares of common stock granted	285,376		285,376																													750,000		500,000
Shares of common stock granted, expiration date																																Oct. 31, 2022		Jul. 31, 2016		Sep. 30, 2014
Expiration period																															10 years
Options vesting period, beginning one year after the date of the grant			3 years
Number of Shares, Granted			400,000		158,000	400,000													139,000	350,000									200,000	200,000			150,000		50,000
Weighted-average value per option granted											$ 4.61	$ 4.61	$ 3.85	$ 3.85	$ 3.03	$ 3.03	$ 3.01	$ 3.01			$ 3.05	$ 3.05	$ 2.49	$ 2.49	$ 1.90	$ 1.90	$ 1.71	$ 1.71	$ 12.78	$ 10.40
Options valued by Black Scholes pricing model					19,000	50,000
Exercise of stock options			662	607
Aggregate intrinsic value of options exercised			339
Stock option compensation expense							487	248	112	102
Taxes related to stock option compensation expense							180	94	41	39
Unrecognized compensation cost related to stock options granted-but-not-yet-vested that are expected to become exercisable	1,156		1,156
Weighted-average period cost is to be recognized			2 years				2 years
Forfeiture provisions lapse period for non-employee directors			1 year
Transfer restrictions lapse period for non-employee directors			6 months
Unrecognized compensation cost related to non-vested restricted stock awards	$ 291		$ 291