Revenue - Additional Information (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 29, 2018	Dec. 31, 2017	Dec. 30, 2017
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Decrease to prepaid expenses and other current assets	$ (33,259)		$ (26,805)
Increase to deferred income tax liability	206,070		$ 143,591
Deferred revenue recognized	$ 71,930
Revenue, practical expedient, remaining performance obligation, description	contracts with an original expected length of one year or less.
Revenue, remaining performance obligation, optional exemption, performance obligation	true
Other Liabilities
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Long-term deferred revenue	$ 1,234
Accounting Standards Update 2014-09 | Retained Earnings
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Net increase to opening retained earnings		$ 2,145
Difference between Revenue Guidance in Effect Before and After Topic 606 | Accounting Standards Update 2014-09
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Decrease to deferred revenue		3,501
Decrease to prepaid expenses and other current assets		568
Increase to deferred income tax liability		$ 788