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Warranty Reserves (Details)
$ in Thousands
12 Months Ended
Jan. 01, 2017
USD ($)
years
Jan. 03, 2016
USD ($)
Dec. 28, 2014
USD ($)
Warranty reserve activity      
Period of warranty protection beyond date of sale (in years) | years 1    
Balance beginning of period $ 9,843 $ 9,593 $ 9,643
Provision charged to income 14,901 15,792 15,995
Payments (14,749) (14,936) (15,634)
Adjustments to previously provided warranties, net (850) (146) 73
Foreign currency and acquisitions (133) (460) (484)
Balance end of period $ 9,012 $ 9,843 $ 9,593