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LONG-TERM DEBT- Narrative (Details)
3 Months Ended 6 Months Ended
Jul. 27, 2021
USD ($)
Jan. 16, 2018
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Debt Instrument [Line Items]          
Repaid borrowings $ 350,000,000        
Loss on extinguishment of debt       $ 596,000 $ 0
Senior Secured Revolving Credit Facility | Line of Credit          
Debt Instrument [Line Items]          
Debt term 5 years 5 years      
Credit facility $ 800,000,000 $ 1,000,000,000      
Loss on extinguishment of debt     $ 600,000 600,000  
Amount outstanding under credit facility     $ 350,000,000 $ 350,000,000  
Adjusted consolidated EBITDA percentage       125.00%  
Commitment fee percentage       0.20%  
Maximum leverage ratio     4.00 4.00  
Debt default, acceleration clause, required consent percentage 50.00%        
Unamortized debt issuance costs     $ 5,500,000 $ 5,500,000  
Senior Secured Revolving Credit Facility | Line of Credit | Prepaid Expenses and Other Current Assets          
Debt Instrument [Line Items]          
Unamortized debt issuance costs     1,100,000 1,100,000  
Senior Secured Revolving Credit Facility | Line of Credit | Other Assets          
Debt Instrument [Line Items]          
Unamortized debt issuance costs     $ 4,400,000 $ 4,400,000  
Senior Secured Revolving Credit Facility | Line of Credit | Maximum          
Debt Instrument [Line Items]          
Leverage ratio     3.50 3.50  
Commitment fee percentage       0.30%  
Senior Secured Revolving Credit Facility | Line of Credit | Maximum | Foreign Subsidiaries          
Debt Instrument [Line Items]          
Voting stock pledge limit for any foreign subsidiary   65.00%      
Senior Secured Revolving Credit Facility | Line of Credit | Minimum          
Debt Instrument [Line Items]          
Leverage ratio     1.50 1.50  
Commitment fee percentage       0.15%  
Senior Secured Revolving Credit Facility | Line of Credit | Federal Funds Effective Rate          
Debt Instrument [Line Items]          
Interest rate in excess of effective rate 0.50%        
Senior Secured Revolving Credit Facility | Line of Credit | LIBOR          
Debt Instrument [Line Items]          
Interest rate in excess of effective rate 1.00%        
Senior Secured Revolving Credit Facility | Line of Credit | LIBOR | LIBOR Loans          
Debt Instrument [Line Items]          
Interest rate in excess of effective rate       1.25%  
Senior Secured Revolving Credit Facility | Line of Credit | LIBOR | LIBOR Loans | Maximum          
Debt Instrument [Line Items]          
Interest rate in excess of effective rate       2.00%  
Senior Secured Revolving Credit Facility | Line of Credit | LIBOR | LIBOR Loans | Minimum          
Debt Instrument [Line Items]          
Interest rate in excess of effective rate       1.00%  
Senior Secured Revolving Credit Facility | Line of Credit | Base Rate | Base Rate Loans          
Debt Instrument [Line Items]          
Interest rate in excess of effective rate       0.25%  
Senior Secured Revolving Credit Facility | Line of Credit | Base Rate | Base Rate Loans | Maximum          
Debt Instrument [Line Items]          
Interest rate in excess of effective rate       1.00%  
Senior Secured Revolving Credit Facility | Line of Credit | Base Rate | Base Rate Loans | Minimum          
Debt Instrument [Line Items]          
Interest rate in excess of effective rate       0.00%  
Letter of Credit Sub-facility | Line of Credit          
Debt Instrument [Line Items]          
Credit facility $ 75,000,000 $ 75,000,000      
Senior Secured Revolving Credit Facility Leverage Ratio Terms Two | Line of Credit | Maximum          
Debt Instrument [Line Items]          
Leverage ratio     2.75 2.75  
Senior Secured Revolving Credit Facility Leverage Ratio Terms Two | Line of Credit | Minimum          
Debt Instrument [Line Items]          
Leverage ratio     1.50 1.50