Contractual interest rate for funds borrowed, under the debt agreement.

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FAIR VALUE MEASUREMENTS (Schedule of Fair Value and Carrying Amount of Debt Obligations) (Details) $ in Thousands	Jun. 28, 2020 USD ($)	Dec. 29, 2019 USD ($)	Sep. 29, 2017	Mar. 11, 2015
Cost of Capital \| Valuation Technique, Discounted Cash Flow
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt measurement input	0.005	0.036
Senior notes \| Fixed-rate senior notes payable at 5.75%, at Level 1 inputs
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Stated interest rate	5.75%			5.75%
Senior notes \| Fixed-rate senior notes payable at 5.875%, at Level 1 inputs
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Stated interest rate	5.875%		5.875%
Senior notes \| Level 1 \| Carrying Amount \| Fixed-rate senior notes payable at 5.75%, at Level 1 inputs
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt	$ (1,001,894)	$ (1,002,095)
Senior notes \| Level 1 \| Carrying Amount \| Fixed-rate senior notes payable at 5.875%, at Level 1 inputs
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt	(844,792)	(844,433)
Senior notes \| Level 1 \| Fair Value \| Fixed-rate senior notes payable at 5.75%, at Level 1 inputs
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt	(1,002,500)	(1,034,200)
Senior notes \| Level 1 \| Fair Value \| Fixed-rate senior notes payable at 5.875%, at Level 1 inputs
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt	(850,910)	(919,505)
Secured loans \| Level 3 \| Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt	(136)	(948)
Secured loans \| Level 3 \| Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt	$ (135)	$ (939)