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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, 2014
Sep. 30, 2013
Sep. 30, 2012
Feb. 28, 2013
Incentive Stock Plan 2011 [Member]
Sep. 30, 2014
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, 2014
Incentive Stock Plan 2007 [Member]
Sep. 30, 2014
Incentive Stock Plans [Member]
Sep. 30, 2013
Incentive Stock Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Common stock, shares authorized 0       2,000,000 1,200,456 2,200,456      
Additional shares threshold       1,000,000            
Number of Common stock shares available               200,456    
Expiration of Plan 2011         2021-01          
Contractual term of plan 2011         10 years          
Weighted average grant fair value of options granted $ 6.23 $ 4.49 $ 4.30              
Total intrinsic value of options exercised $ 4,500,000 $ 3,300,000 $ 1,400,000              
Weighted average period unrecognized compensation costs related to non-vested options                 2 years 2 years
Unrecognized compensation costs related to non-vested options 2,200,000 980,000                
Fair value of options vested $ 1,900,000 $ 2,500,000 $ 3,100,000