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Long-term Debt - Senior Secured Term Loan (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Sep. 30, 2016
Aug. 31, 2016
Jul. 31, 2016
Mar. 31, 2016
Mar. 31, 2015
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2013
Sep. 30, 2011
Long-term debt                    
Debt instrument, face amount $ 768,800         $ 768,800 $ 573,900      
Net proceeds from issuance of long-term debt           343,453 414,675 $ 146,650    
Interest expense associated with debt transactions           $ 3,100        
Term Loan Facility                    
Long-term debt                    
Percentage of original principal amount on which the aggregate amount of annual scheduled repayments is determined         1.00%          
Interest rate 4.00%         4.00%        
Debt prepayment premium percentage           1.00%        
Maximum percentage of annual excess cash flow required to be used for prepayment           50.00%        
Annual excess cash flow threshold for required prepayment           $ 1,000        
Percentage of net cash proceeds of non-ordinary course asset sales required to be used for prepayment           100.00%        
Percentage of net cash proceeds of certain issuances of debt required to be used for prepayment           100.00%        
Term Loan Facility | Prime Rate                    
Long-term debt                    
Variable interest rate base           prime rate        
Minimum floor variable percentage under terms of the debt agreement           2.00%        
Secondary variable rate margin (as a percent)           2.00%        
Term Loan Facility | Federal funds rate                    
Long-term debt                    
Variable interest rate base           federal funds rate        
Interest rate margin (as a percent)           0.50%        
Minimum floor variable percentage under terms of the debt agreement           2.00%        
Secondary variable rate margin (as a percent)           2.00%        
Term Loan Facility | Eurocurrency rate (LIBO)                    
Long-term debt                    
Variable interest rate base           LIBO        
Minimum floor variable percentage under terms of the debt agreement           1.00%        
Secondary variable rate margin (as a percent)           3.00%        
Term Loan Facility | Thirty Day LIBO                    
Long-term debt                    
Variable interest rate base           30-day LIBO        
Interest rate margin (as a percent)           1.00%        
Minimum floor variable percentage under terms of the debt agreement           2.00%        
Secondary variable rate margin (as a percent)           3.00%        
Senior secured term loan, due March 2022                    
Long-term debt                    
Debt instrument, face amount $ 768,804       $ 425,000 $ 768,804 423,938      
Net proceeds from issuance of long-term debt         414,700          
Original issue discount         2,100          
Transaction costs         8,200          
Incremental senior secured term loan, due March 2022                    
Long-term debt                    
Debt instrument, face amount   $ 350,000                
Net proceeds from issuance of long-term debt   341,600                
Original issue discount   900                
Transaction costs   7,500                
Interest expense associated with debt transactions   1,800                
Debt issue costs   $ 5,700                
Incremental term loans | Maximum                    
Long-term debt                    
Maximum borrowing capacity         $ 150,000          
7.25% Senior notes, due January 2019                    
Long-term debt                    
Debt instrument, face amount             $ 150,000   $ 150,000  
Redemption of senior notes $ 99,000   $ 47,250 $ 3,750            
Interest rate on secured notes (as a percent) 7.25% 7.25%   7.25%   7.25% 7.25%   7.25%  
Senior Secured Notes 7.625 Percent                    
Long-term debt                    
Debt instrument, face amount                   $ 400,000
Interest rate on secured notes (as a percent) 7.625%         7.625% 7.625%     7.625%