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Long-Term Debt - Additional Information (Details) - USD ($)
6 Months Ended 12 Months Ended
Aug. 15, 2018
Jul. 02, 2018
Apr. 28, 2017
Dec. 18, 2013
Mar. 31, 2019
Mar. 31, 2018
Sep. 30, 2018
Feb. 21, 2019
Debt Instrument [Line Items]                
Debt repayments         $ 92,778,000 $ 46,167,000    
Level 2 Inputs                
Debt Instrument [Line Items]                
Long-term debt, fair value         1,172,789,000   $ 1,182,152,000  
Receivables Financing Agreement | Wholly-owned Subsidiary                
Debt Instrument [Line Items]                
Credit agreement, maximum borrowing capacity     $ 175,000,000         $ 200,000,000
Debt instrument, maturity date     Apr. 27, 2020          
Debt voluntary repayment         75,000,000      
Line of credit facility, current borrowing         85,000,000      
Credit Agreement | First Lien Credit Facility Term Loans                
Debt Instrument [Line Items]                
Credit agreement date       Dec. 18, 2013        
Debt instrument, term       7 years        
Credit agreement, maximum borrowing capacity       $ 1,460,000,000        
Debt repayments             347,050,000  
Credit Agreement | First Lien Credit Facility Term Loans | Contractual Repayments                
Debt Instrument [Line Items]                
Debt repayments             10,950,000  
Credit Agreement | First Lien Credit Facility Term Loans | Voluntary Repayments | IPO                
Debt Instrument [Line Items]                
Debt repayments             336,100,000  
Credit Agreement | First Lien Revolving Credit Facility                
Debt Instrument [Line Items]                
Debt instrument, term       5 years        
Credit agreement, maximum borrowing capacity       $ 210,000,000        
Amended Credit Agreement | First Lien Revolving Credit Facility                
Debt Instrument [Line Items]                
Debt instrument, term 5 years              
Credit agreement, maximum borrowing capacity $ 260,000,000              
Amended Credit Agreement | Series B Term Loan                
Debt Instrument [Line Items]                
Debt instrument, term 7 years              
Credit agreement, maximum borrowing capacity $ 1,037,000,000              
Debt repayments         7,778,000      
Debt instrument, original discount $ 2,775,000              
Debt instrument, basis spread on variable rate 2.50%              
Revolving Credit Facility | First Lien Revolving Credit Facility                
Debt Instrument [Line Items]                
Credit agreement, maximum borrowing capacity         210,000,000      
Line of credit facility, amount outstanding balance             $ 0  
Revolving Credit Facility | IPO                
Debt Instrument [Line Items]                
Debt repayments   $ 55,000,000            
Revolving Credit Facility | First Lien Revolving Credit Facility                
Debt Instrument [Line Items]                
Credit agreement, maximum borrowing capacity $ 260,000,000              
Debt repayments         10,000,000      
Debt instrument, maturity date Aug. 15, 2023              
Line of credit facility, amount outstanding balance         $ 0      
Revolving Credit Facility | First Lien Revolving Credit Facility | LIBOR | Minimum                
Debt Instrument [Line Items]                
Debt instrument, basis spread on variable rate 2.00%              
Revolving Credit Facility | First Lien Revolving Credit Facility | LIBOR | Maximum                
Debt Instrument [Line Items]                
Debt instrument, basis spread on variable rate 2.50%