Quarterly report pursuant to Section 13 or 15(d)

Debt - Additional Information (Details)

v3.10.0.1
Debt - Additional Information (Details)
3 Months Ended 9 Months Ended
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Apr. 16, 2012
USD ($)
Aug. 31, 2018
USD ($)
May 31, 2018
USD ($)
May 31, 2018
USD ($)
May 31, 2017
USD ($)
Jun. 22, 2018
USD ($)
Debt Instrument [Line Items]                
Senior credit facility expansion option, available         $ 450,000,000 $ 450,000,000    
Debt Instrument, actual interest rate         4.00% 4.00%    
Repayments of Senior Debt             $ (500,000)  
Libor Rate                
Debt Instrument [Line Items]                
Debt instrument, interest rate over variable rate         2.00%      
Revolving Credit Facility                
Debt Instrument [Line Items]                
Debt Instrument, Maturity Date         May 08, 2020      
Maximum borrowing capacity         $ 600,000,000 $ 600,000,000    
Line of Credit | Senior Credit Facility - Revolver                
Debt Instrument [Line Items]                
Unused credit line         598,300,000 598,300,000    
Unused credit line Available for Borrowing, Amount         $ 146,100,000 146,100,000    
Senior Notes | 5.625% Senior Notes                
Debt Instrument [Line Items]                
Debt Instrument, Maturity Date         Jun. 15, 2022      
Debt Instrument, Face Amount     $ 300,000,000          
Debt instrument, interest rate     5.625%          
Debt Instrument, Redemption Price, Percentage             103.00%  
Repayments of Senior Debt           $ 0 $ (500,000)  
Minimum                
Debt Instrument [Line Items]                
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage         0.15%      
Interest coverage ratio         3.5 3.5    
Minimum | Libor Rate                
Debt Instrument [Line Items]                
Debt instrument, interest rate over variable rate         1.00%      
Minimum | Base Rate                
Debt Instrument [Line Items]                
Debt instrument, interest rate over variable rate         0.00%      
Minimum | Senior Notes | 5.625% Senior Notes                
Debt Instrument [Line Items]                
Debt Instrument, Redemption Price, Percentage     100.00%          
Maximum                
Debt Instrument [Line Items]                
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage         0.35%      
Leverage ratio         3.75 3.75    
Maximum | Libor Rate                
Debt Instrument [Line Items]                
Debt instrument, interest rate over variable rate         2.25%      
Maximum | Base Rate                
Debt Instrument [Line Items]                
Debt instrument, interest rate over variable rate         1.25%      
Maximum | Senior Notes | 5.625% Senior Notes                
Debt Instrument [Line Items]                
Debt Instrument, Redemption Price, Percentage     102.80%          
Starting on June 30, 2016 | Senior Credit Facility - Term Loan                
Debt Instrument [Line Items]                
Quarterly installments, payable on term loan   $ 3,800,000            
Starting on June 30, 2017 | Senior Credit Facility - Term Loan                
Debt Instrument [Line Items]                
Quarterly installments, payable on term loan $ 7,500,000              
Reduced the borrowing capacity on the revolver [Domain] | Revolving Credit Facility                
Debt Instrument [Line Items]                
Maximum borrowing capacity               $ 300,000,000
Write off of deferred financing costs       $ 1,000,000