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The Incentive Stock Plans - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
 6 Months Ended 1 Months Ended 6 Months Ended 6 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Feb. 28, 2013
Incentive Stock Plan 2011 [Member]
Mar. 31, 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]
Mar. 31, 2014
Incentive Stock Plan 2007 [Member]
Mar. 31, 2014
Incentive Stock Plans [Member]
Mar. 31, 2013
Incentive Stock Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Common stock, shares authorized       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 $ 4.48              
Total intrinsic value of options exercised $ 3.1 $ 2.2              
Weighted average period unrecognized compensation costs related to non-vested options               2 years 4 months 24 days 2 years 3 months 18 days
Unrecognized compensation costs related to non-vested options 2.8 1.8              
Fair value of options vested $ 1.3 $ 1.6