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LONG-TERM OBLIGATIONS - Narrative (Details) - USD ($)
3 Months Ended 8 Months Ended 9 Months Ended 10 Months Ended 14 Months Ended 36 Months Ended
Feb. 04, 2019
Sep. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Feb. 04, 2024
Mar. 31, 2020
Mar. 31, 2023
Dec. 31, 2019
Debt Instrument [Line Items]                      
Debt issuance costs           $ 0 $ 847,000        
Consolidated leverage ratio   1.0       1.0          
Consolidated interest coverage ratio   18.9       18.9          
Credit facility, maximum borrowing capacity $ 725,000,000.0                    
Principal amount   $ 314,200,000       $ 314,200,000         $ 245,700,000
Term Loan [Member] | One Hundred Seventy Five Million Term Loan Facility [Member]                      
Debt Instrument [Line Items]                      
Debt instrument, face amount   $ 175,000,000.0       $ 175,000,000.0          
Weighted average interest rate (percent)   1.70%   3.70% 3.90% 2.30%          
Maturity Date           Feb. 04, 2024          
Principal amount   $ 166,300,000       $ 166,300,000         171,700,000
Revolving Credit Facility [Member] | 550 Million Revolving Credit Facility [Member]                      
Debt Instrument [Line Items]                      
Debt instrument, face amount   $ 550,000,000.0       $ 550,000,000.0          
Weighted average interest rate (percent)   1.80%   3.80%   2.20% 3.90%        
Maturity Date           Feb. 04, 2024          
Remaining availability under revolving credit facility   $ 376,200,000       $ 376,200,000          
Principal amount   145,000,000.0       145,000,000.0         $ 70,000,000.0
Line of Credit [Member] | 550 Million Revolving Credit Facility [Member]                      
Debt Instrument [Line Items]                      
Outstanding letters of credit   $ 28,800,000       $ 28,800,000          
Amended Credit Agreement [Member]                      
Debt Instrument [Line Items]                      
Debt issuance costs     $ 800,000                
Maturity Date Feb. 04, 2024                    
Additional interest rate above Federal Fund rate 0.50%                    
Additional interest rate above Eurodollar rate 1.00%                    
Percentage of consolidated revenue and adjusted EBITDA that guarantor wholly-owned subsidiaries represent 95.00%                    
Percentage of adjusted EBITDA that guarantor subsidiaries represent 70.00%                    
Amended Credit Agreement [Member] | 550 Million Revolving Credit Facility [Member]                      
Debt Instrument [Line Items]                      
Debt instrument, face amount $ 550,000,000.0                    
Amended Credit Agreement [Member] | One Hundred Seventy Five Million Term Loan Facility [Member]                      
Debt Instrument [Line Items]                      
Debt Instrument Periodic Payment Percentage                 0.625%    
Debt instrument, face amount $ 175,000,000.0                    
Base Rate [Member] | Amended Credit Agreement [Member]                      
Debt Instrument [Line Items]                      
Description of variable rate basis Fluctuating rate per annum equal to the highest of (a) the federal funds rate plus 0.50% per annum, (b) the prime rate of interest established by the Administrative Agent, and (c) the Eurodollar Rate for an interest period of one month plus 1% per annum.                    
Base Rate [Member] | Amended Credit Agreement [Member]                      
Debt Instrument [Line Items]                      
Basis spread on variable rate           0.50%          
Eurodollar [Member] | Amended Credit Agreement [Member]                      
Debt Instrument [Line Items]                      
Description of variable rate basis Rate at which Eurodollar deposits in the London interbank market for an interest period of one, two, three or six months                    
Eurodollar [Member] | Term Loan [Member] | One Hundred Seventy Five Million Term Loan Facility [Member]                      
Debt Instrument [Line Items]                      
Debt Instrument Interest Rate at Period End   1.70%       1.70%          
Eurodollar [Member] | Revolving Credit Facility [Member] | 550 Million Revolving Credit Facility [Member]                      
Debt Instrument [Line Items]                      
Debt Instrument Interest Rate at Period End   1.70%       1.70%          
Eurodollar [Member] | Amended Credit Agreement [Member]                      
Debt Instrument [Line Items]                      
Basis spread on variable rate           1.50%          
Minimum [Member] | Amended Credit Agreement [Member]                      
Debt Instrument [Line Items]                      
Proceeds Received From Loan Party Of Subsidiary $ 5,000,000                    
Subsequent Event | Amended Credit Agreement [Member] | One Hundred Seventy Five Million Term Loan Facility [Member]                      
Debt Instrument [Line Items]                      
Debt Instrument Periodic Payment Percentage               1.875%   1.25%