Long-Term Debt (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 30, 2017
Debt Disclosure [Line Items]
Line of credit, Current and Noncurrent, Foreign	$ 8,200
Line of Credit Facility, Maximum Borrowing Capacity	2,500,000
Line of Credit Facility, Potential Additional Borrowing Capacity	3,000,000
Senior secured revolving credit line	2,058,287	$ 1,022,935
Other Long-term Debt	175	178
Total debt	2,066,625	1,028,881
Less: Current maturities of long-term debt	6,297	5,149
Long-term debt	2,060,328	1,023,732
Line of Credit Facility, Outstanding Amount, USD Borrowings	2,000,000
Line of Credit Facility, Outstanding Amount, EUR Borrowings	87,600
Line of Credit Facility, Amount Outstanding, GBP Borrowings	19,700
Letters of Credit Outstanding, Amount	9,700
Line of Credit Facility, Remaining Borrowing Capacity	$ 400,000
Line of Credit Facility, Interest Rate at Period End	4.08%
Foreign
Debt Disclosure [Line Items]
Foreign loans	$ 8,163	$ 5,768