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NOTES PAYABLE AND COMMERCIAL BANK FINANCING - Bank Credit Agreements (Details)
1 Months Ended 3 Months Ended
Mar. 17, 2020
USD ($)
Aug. 23, 2019
USD ($)
Apr. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Debt Instrument [Line Items]        
Borrowings under revolving credit facility exceed total commitments (as a percent)       35.00%
STG Revolving Credit Facility        
Debt Instrument [Line Items]        
Drew down from credit facility $ 648,000,000      
Maximum borrowing capacity   $ 650,000,000    
Debt term       5 years
Borrowings outstanding       $ 648,000,000
Letters of credit       1,400,000
Available borrowing capacity       $ 600,000
First lien leverage ratio       4.5
DSG Revolving Credit Facility        
Debt Instrument [Line Items]        
Drew down from credit facility $ 225,000,000      
Maximum borrowing capacity   $ 650,000,000    
Debt term       5 years
Borrowings outstanding       $ 225,000,000
Available borrowing capacity       $ 425,000,000
First lien leverage ratio       6.25
LIBOR | STG Revolving Credit Facility        
Debt Instrument [Line Items]        
Basis spread on variable rate   2.00%    
LIBOR | DSG Revolving Credit Facility        
Debt Instrument [Line Items]        
Basis spread on variable rate   3.00%    
Subsequent Event | STG Revolving Credit Facility        
Debt Instrument [Line Items]        
Repayment of outstanding borrowings     $ 423,000,000