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Stock-Based Compensation - Narrative (Detail) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2016
Mar. 31, 2015
Sep. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Restricted stocks granted     1,361,998 1,443,959  
Shares issued (in shares)     118,548 96,415  
Payments for repurchase of common stock     $ 0.9 $ 0.9  
Board of Director Units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Restricted stocks granted     83,998 68,459  
Restricted Stock, Performance Based Shares          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Restricted stocks granted     836,250 824,250  
Performance-based awards granted, percent     100.00%    
Restricted stock units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Restricted stocks granted     1,361,998    
Awards canceled (shares)     1,109,039    
Awards granted (USD per share) $ 9.37 $ 12.12 $ 11.14 $ 11.95  
Fair value of restricted stock awards vested $ 0.6 $ 1.0 $ 14.0 $ 7.9  
Withholding taxes paid   $ 2.2 4.4    
Unrecognized compensation cost $ 16.0   $ 16.0    
Unrecognized compensation cost, estimated weighted average amortization period     1 year 10 months    
Maximum | Restricted Stock, Performance Based Shares          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Performance-based awards granted, percent     200.00%    
Minimum | Restricted Stock, Performance Based Shares          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Performance-based awards granted, percent       0.00%  
Share-based Compensation Award, Tranche One | Restricted Stock, Performance Based Shares          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Potentially vested shares         60.00%
Awards canceled (shares)         495,684
Share-based Compensation Award, Tranche Two | Restricted Stock, Performance Based Shares          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Measurement period         3 years
Potentially vested shares         40.00%
Shares, potentially vested         351,066
Director | Restricted Stock Units (RSUs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Restricted stocks granted     55,380 49,267  
Restricted Stock Units (RSUs) | Director          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Restricted stocks granted     25,560 13,318  
Quarterly dividends (in shares)     3,058 6,054  
Employee Stock Purchase Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Purchase price of common stock (percent)     85.00%    
Shares issued (in shares) 118,548 96,415      
Payments for repurchase of common stock $ 0.9 $ 0.9