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Rollforward of Warranty Reserve (Details)
$ in Thousands
6 Months Ended
Jul. 01, 2017
USD ($)
Disclosure Rollforward Of Warranty Reserve [Abstract]  
Standard and Extended Product Warranty Accrual, Additions from Business Acquisition $ 6,288
Beginning balance 40,851
Warranty expense 27,611
Warranty claims (25,785)
Ending balance $ 48,965