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Stock-Based Compensation - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Aug. 24, 2015
May. 28, 2015
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Mar. 31, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Stock-based compensation expense, net of tax     $ 143 $ 179 $ 292 $ 377  
Stock-based compensation expense, net of tax, per diluted share     $ 0.01 $ 0.02 $ 0.03 $ 0.04  
Shares of common stock granted [1]     169,232   169,232    
Options vesting period, beginning one year after the date of the grant         3 years    
Options valued by Black Scholes pricing model         15,000   55,000
Number of Shares, Granted         120,000   440,000
Exercise of stock options         $ 643 $ 662  
Aggregate intrinsic value of options exercised         282    
Unrecognized compensation cost related to stock options granted-but-not-yet-vested that are expected to become exercisable     $ 927   $ 927    
Weighted-average period cost is to be recognized         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     $ 372   $ 372    
Employee Stock Option              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Stock option compensation expense         325 487  
Taxes related to stock option compensation expense         $ 115 180  
Weighted-average period cost is to be recognized         1 year    
Restricted Stock              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Stock option compensation expense         $ 126 112  
Taxes related to stock option compensation expense         $ 44 $ 41  
Black Scholes Based Option Pricing Model | 2016 $3.66 Value Per Option              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Weighted-average value per option granted         $ 3.66    
Black Scholes Based Option Pricing Model | 2016 $4.91 Value Per Option              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Weighted-average value per option granted         4.91    
Black Scholes Based Option Pricing Model | 2015 $4.61 Value Per Option              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Weighted-average value per option granted         4.61   $ 4.61
Black Scholes Based Option Pricing Model | 2015 $3.85 Value Per Option              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Weighted-average value per option granted         3.85   3.85
Black Scholes Based Option Pricing Model | 2015 $3.72 Value Per Option              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Weighted-average value per option granted         $ 3.72   $ 3.72
Monte Carlo Simulation              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Number of Shares, Granted         105,000   385,000
Monte Carlo Simulation | 2016 $2.49 Value Per Option              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Weighted-average value per option granted         $ 2.49    
Monte Carlo Simulation | 2015 $3.05 Value Per Option              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Weighted-average value per option granted         3.05   $ 3.05
Monte Carlo Simulation | 2015 $2.49 Value Per Option              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Weighted-average value per option granted         $ 2.49   $ 2.49
Serge Dupuis, Chief Financial Officer              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Options valued by Black Scholes pricing model   40,000          
Mark M. McMillin, General Counsel and Corporate Secretary              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Options valued by Black Scholes pricing model 50,000            
Maximum              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Expiration period         10 years    
2012 Plan              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Shares of common stock granted     750,000   750,000    
Shares of common stock granted, expiration date         Oct. 31, 2022    
2006 Plan              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Shares of common stock granted     500,000   500,000    
Shares of common stock granted, expiration date         Jul. 31, 2016    
[1] May be decreased by restricted stock grants.