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NOTES PAYABLE, FINANCE LEASES, AND COMMERCIAL BANK FINANCING - Bank Credit Agreements (Details)
3 Months Ended
Apr. 01, 2021
USD ($)
Mar. 31, 2021
USD ($)
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]    
First lien leverage ratio   4.5
Borrowings outstanding   $ 0
DSG Revolving Credit Facility    
Debt Instrument [Line Items]    
First lien leverage ratio   6.25
STG Term Loan Facility | Term Loan B-3    
Debt Instrument [Line Items]    
Aggregate principal amount $ 740,000,000  
LIBOR | STG Term Loan Facility | Term Loan B-3    
Debt Instrument [Line Items]    
Basis spread on variable rate 3.00%