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Related Party - Additional Information (Detail) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017	Dec. 30, 2017
Ms. Winfrey and her related entities
Related Party Transaction [Line Items]
Related Party Transaction, service provided by related party	$ 689	$ 874	$ 1,988	$ 2,556
Ms. Winfrey
Related Party Transaction [Line Items]
Accounts payable to related parties	$ 233		$ 233		$ 828
Number of shares purchased from related party			954
Stock options exercised			1,405

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Amount for accounts payable to related parties.

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