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Extended Product Warranty Included in Short and Long-Term Deferred Revenue and Customer Advances (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Oct. 01, 2017
Oct. 02, 2016
Oct. 01, 2017
Oct. 02, 2016
Product Warranty Liability [Line Items]        
Balance at beginning of period $ 29,377 $ 30,422 $ 28,200 $ 30,024
Deferral of new extended warranty revenue 2,636 4,638 17,126 17,036
Recognition of extended warranty deferred revenue (5,521) (5,030) (18,834) (17,030)
Balance at end of period $ 26,492 $ 30,030 $ 26,492 $ 30,030