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Revenues (Contract Assets and Liabilities) (Details) - USD ($)
$ in Thousands
12 Months Ended
Jan. 01, 2021
Jan. 03, 2020
Dec. 28, 2018
Revenue from Contract with Customer [Abstract]      
Contract asset $ 0 $ 1,062  
Current portion 1,790 0  
Long-term portion 3,755 6,596  
Total contract liabilities 5,545 6,596  
Contract revenue recognized, including revenue from deferred revenue beginning balance 9,200 6,500 $ 8,700
Revenues recognized for performance obligations satisfied in previous periods 169,700 $ 161,200 $ 198,100
Transaction price allocated to our performance obligations $ 86,100