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Restricted Stock Awards - Additional Information (Detail) - Restricted Stock Awards [Member]
$ in Millions
6 Months Ended
Mar. 31, 2016
USD ($)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Unrecognized compensation cost related to non-vested restricted stock awards $ 4.8
Weighted average period unrecognized compensation costs related to non-vested restricted awards are expected to be recognized 2 years 9 months 18 days
Minimum [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Vesting periods of restricted stock award 2 years
Maximum [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Vesting periods of restricted stock award 4 years