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Debt (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jan. 15, 2014
Mar. 31, 2018
Mar. 31, 2018
Sep. 30, 2017
Dec. 19, 2017
Jun. 30, 2017
Line of Credit Facility [Line Items]            
Letters of credit outstanding, amount   $ 17,274,000 $ 17,274,000 $ 20,663,000    
Debt instrument, periodic payment, principal     1,991,000      
Unamortized discount (premium) and debt issuance costs, net   14,565,000 14,565,000 16,942,000    
Long-term debt, gross   801,606,000 801,606,000 906,791,000    
Notes payable   2,592,000 2,592,000 3,287,000    
Term Loan [Member]            
Line of Credit Facility [Line Items]            
Line of credit facility, outstanding amount         $ 796,574,000  
Revolving Credit Facility, due January 15, 2019 [Member]            
Line of Credit Facility [Line Items]            
Line of credit facility, maximum borrowing capacity   125,000,000 125,000,000      
Line of credit facility, remaining borrowing capacity   125,000,000 125,000,000 95,000,000    
Debt instrument, unused borrowing capacity, amount   104,388,000 104,388,000 88,294,000    
Letter of Credit [Member]            
Line of Credit Facility [Line Items]            
Line of credit facility, maximum borrowing capacity       35,000,000    
Letters of credit outstanding, amount   $ 20,612,000 $ 20,612,000 6,706,000    
Minimum [Member]            
Line of Credit Facility [Line Items]            
Debt instrument, interest rate, stated percentage   6.26% 6.26%      
Maximum [Member]            
Line of Credit Facility [Line Items]            
Debt instrument, interest rate, stated percentage   7.39% 7.39%      
First Lien Term Facility, due December 20, 2024 [Member]            
Line of Credit Facility [Line Items]            
Debt instrument, term 7 years          
Unamortized discount (premium) and debt issuance costs, net   $ 14,565,000 $ 14,565,000 $ 16,942,000    
First Lien Term Facility, due December 20, 2024 [Member] | Term Loan [Member]            
Line of Credit Facility [Line Items]            
Line of credit facility, maximum borrowing capacity $ 505,000,000          
Debt instrument, interest rate, stated percentage   4.69% 4.69%      
First Lien Term Facility, due December 20, 2024 [Member] | Revolving Credit Facility, due January 15, 2019 [Member]            
Line of Credit Facility [Line Items]            
Line of credit facility, maximum borrowing capacity 75,000,000          
First Lien Term Facility, due December 20, 2024 [Member] | Letter of Credit [Member]            
Line of Credit Facility [Line Items]            
Line of credit facility, maximum borrowing capacity $ 35,000,000          
Second Lien Term Facility            
Line of Credit Facility [Line Items]            
Debt instrument, term 8 years          
Second Lien Term Facility | Term Loan [Member]            
Line of Credit Facility [Line Items]            
Line of credit facility, maximum borrowing capacity $ 75,000,000          
2022 Borrowings | Revolving Credit Facility, due January 15, 2019 [Member]            
Line of Credit Facility [Line Items]            
Line of credit facility, maximum borrowing capacity   $ 87,500,000 $ 87,500,000      
Line of credit facility, interest rate at period end   6.50% 6.50%      
Variable rate basis interest rate at period end   4.75% 4.75%      
2019 Borrowings | Revolving Credit Facility, due January 15, 2019 [Member]            
Line of Credit Facility [Line Items]            
Line of credit facility, maximum borrowing capacity   $ 37,500,000 $ 37,500,000      
Line of credit facility, interest rate at period end   7.00% 7.00% 6.50%    
Variable rate basis interest rate at period end   4.75% 4.75% 4.25%    
Base Rate [Member] | First Lien Term Facility, due December 20, 2024 [Member] | Term Loan [Member]            
Line of Credit Facility [Line Items]            
Variable rate basis interest rate at period end   2.00% 2.00%      
Base Rate [Member] | 2022 Borrowings | Minimum [Member] | Revolving Credit Facility, due January 15, 2019 [Member]            
Line of Credit Facility [Line Items]            
Debt instrument, basis spread on variable rate     1.50%      
Base Rate [Member] | 2022 Borrowings | Maximum [Member] | Revolving Credit Facility, due January 15, 2019 [Member]            
Line of Credit Facility [Line Items]            
Debt instrument, basis spread on variable rate     2.75%      
Base Rate [Member] | 2019 Borrowings | Minimum [Member] | Revolving Credit Facility, due January 15, 2019 [Member]            
Line of Credit Facility [Line Items]            
Debt instrument, basis spread on variable rate       2.00%    
Base Rate [Member] | 2019 Borrowings | Maximum [Member] | Revolving Credit Facility, due January 15, 2019 [Member]            
Line of Credit Facility [Line Items]            
Debt instrument, basis spread on variable rate       3.25%    
Prime Rate [Member] | 2022 Borrowings | Revolving Credit Facility, due January 15, 2019 [Member]            
Line of Credit Facility [Line Items]            
Debt instrument, basis spread on variable rate     1.75%      
Prime Rate [Member] | 2019 Borrowings | Revolving Credit Facility, due January 15, 2019 [Member]            
Line of Credit Facility [Line Items]            
Debt instrument, basis spread on variable rate     2.25%      
London Interbank Offered Rate (LIBOR) [Member] | First Lien Term Facility, due December 20, 2024 [Member] | Term Loan [Member]            
Line of Credit Facility [Line Items]            
Debt instrument, basis spread on variable rate     3.00%      
Debt instrument, interest rate, stated percentage   1.69% 1.69%      
Variable rate basis interest rate at period end   3.00% 3.00%      
London Interbank Offered Rate (LIBOR) [Member] | Build Own Operate Financing, due June 30, 2024 [Member]            
Line of Credit Facility [Line Items]            
Debt instrument, basis spread on variable rate     3.00%      
Line of Credit [Member] | Letter of Credit [Member]            
Line of Credit Facility [Line Items]            
Line of credit facility, maximum borrowing capacity   $ 45,000,000 $ 45,000,000 $ 35,000,000    
Letters of credit outstanding, amount   51,000 $ 51,000 10,568,000    
Loans Payable [Member] | Build Own Operate Financing, due June 30, 2024 [Member]            
Line of Credit Facility [Line Items]            
Debt instrument, term     7 years      
Debt instrument, periodic payment, principal   $ 254,000        
Debt instrument, fee amount           $ 50,000
Debt instrument, interest rate, stated percentage   5.08% 5.08%      
Debt instrument, face amount           $ 7,100,000
Long-term debt, gross   $ 6,423,000 $ 6,423,000 $ 6,930,000    
Ratings Condition Period [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member] | Term Loan [Member]            
Line of Credit Facility [Line Items]            
Debt instrument, basis spread on variable rate     3.75%      
Other than Ratings Condition Period [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member] | Term Loan [Member]            
Line of Credit Facility [Line Items]            
Debt instrument, basis spread on variable rate     3.00%