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LONG-TERM DEBT AND CAPITAL LEASE OBLIGATIONS - Schedule of Long-Term Debt (Details) - USD ($) $ in Thousands	Mar. 30, 2019	Dec. 30, 2018	Dec. 29, 2018
Debt Instrument [Line Items]
Finance leases	$ 28,939
Finance leases			$ 29,240
Total debt and finance leases	1,586,891		1,684,228
Current portion of long-term debt	28,225		28,228
Current portion of finance leases	2,430
Current portion of finance leases			3,188
Current portion of long-term debt and finance leases	30,655		31,416
Long-term debt and finance leases	1,556,236		1,652,812
Debt discount and debt issuance costs	(15,403)		(16,214)
Long-term debt, net and finance leases	1,540,833	$ 1,610,415	1,636,598
Term loans
Debt Instrument [Line Items]
Long-term debt, gross	721,875		731,250
Revolving facility
Debt Instrument [Line Items]
Long-term debt, gross	335,976		397,452
Senior Notes
Debt Instrument [Line Items]
Long-term debt, gross	500,000		500,000
Other debt
Debt Instrument [Line Items]
Long-term debt, gross	$ 101		$ 26,286

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