Bank Indebtedness and Long-Term Debt (Details) - USD ($) $ in Thousands	Jun. 27, 2020	Dec. 28, 2019
Line of Credit Facility [Line Items]
Line of Credit Facility, Amount Outstanding	$ 204,852	$ 245,536
Senior Secured Second Lien Notes, net of unamortized debt issuance costs	219,148	218,404
Finance lease liabilities	15,143	16,223
Asset-backed term loan	4,151	4,386
Other	5,619	6,178
Total Long-term and Current Term Debt	244,061	245,191
Less: current portion	3,276	2,987
Long-term Debt, Excluding Current Maturities, Total	240,785	242,204
Unamortized Debt Issuance Expense	4,350	5,094
Global Credit Facility [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Amount Outstanding	202,263	241,666
Bulgarian Credit Facility [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Amount Outstanding	$ 2,589	$ 3,870