XML 86 R72.htm IDEA: XBRL DOCUMENT v3.20.4
Accounts receivable (Allowance for doubtful accounts rollforward) (Details) - USD ($)
$ in Thousands
12 Months Ended
Jan. 02, 2021
Dec. 28, 2019
Receivables [Abstract]    
Balance, beginning of year $ 630 $ 1,209
Net addition (reduction) to provision 627 (84)
Accounts receivable written off, net of recoveries 0 (495)
Balance, end of year $ 1,257 $ 630