Long-Term Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 30, 2017
Debt Disclosure [Line Items]
Line of Credit Facility, Potential Additional Borrowing Capacity	$ 3,000,000
Senior secured revolving credit line	1,043,108	$ 1,022,935
Other Long-term Debt	175	178
Total debt	1,048,998	1,028,881
Less: Current maturities of long-term debt	5,113	5,149
Long-term debt	1,043,885	1,023,732
Line of Credit Facility, Outstanding Amount, USD Borrowings	1,001,000
Line of Credit Facility, Amount Outstanding, GBP Borrowings	42,100
Foreign
Debt Disclosure [Line Items]
Foreign loans	$ 5,715	$ 5,768