Bank Indebtedness and Long-Term Debt (Details) - USD ($) $ in Thousands	Mar. 28, 2020	Dec. 28, 2019
Line of Credit Facility [Line Items]
Line of Credit Facility, Amount Outstanding	$ 224,864	$ 245,536
Senior Secured Second Lien Notes, net of unamortized debt issuance costs	218,771	218,404
Finance lease liabilities	15,762	16,223
Asset-backed term loan	4,215	4,386
Other	5,658	6,178
Total Long-term and Current Term Debt	244,406	245,191
Less: current portion	3,300	2,987
Long-term Debt, Excluding Current Maturities, Total	241,106	242,204
Unamortized Debt Issuance Expense	4,727	5,094
Global Credit Facility [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Amount Outstanding	223,547	241,666
Bulgarian Credit Facility [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Amount Outstanding	$ 1,317	$ 3,870