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The Incentive Stock Plans - Additional Information (Detail) (USD $)
 12 Months Ended 1 Months Ended 12 Months Ended 12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2011
Feb. 28, 2013
Incentive Stock Plan 2011 [Member]
Sep. 30, 2013
Incentive Stock Plan 2011 [Member]
Feb. 28, 2013
Incentive Stock Plan 2011 [Member]
Minimum [Member]
Feb. 28, 2013
Incentive Stock Plan 2011 [Member]
Maximum [Member]
Sep. 30, 2013
Incentive Stock Plan 2007 [Member]
Sep. 30, 2013
Incentive Stock Plans [Member]
Sep. 30, 2012
Incentive Stock Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Common stock, shares authorized 1,000,000 500,000     2,000,000 1,200,456 2,200,456      
Additional shares threshold 52,837     1,000,000            
Number of Common stock shares available               200,456    
Expiration of Plan 2011         2021          
Contractual term of plan 2011         10 years          
Weighted average grant fair value of options granted $ 4.49 $ 4.30 $ 5.15              
Total intrinsic value of options exercised $ 3,300,000 $ 1,400,000 $ 766,000              
Weighted average period unrecognized compensation costs related to non-vested options                 2 years 1 year 10 months 24 days
Unrecognized compensation costs related to non-vested options 980,000 921,000                
Fair value of options vested $ 2,500,000 $ 3,100,000 $ 4,100,000