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Related Party - Additional Information (Detail) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018	Dec. 29, 2018
Ms. Winfrey and her related entities
Related Party Transaction [Line Items]
Related Party Transaction, service provided by related party	$ 662	$ 157	$ 2,665	$ 2,145
Related Party, advertising expenses	330
Ms. Winfrey
Related Party Transaction [Line Items]
Accounts payable to related parties	$ 246		$ 246		$ 62
Number of shares purchased from related party			954
Stock options exercised			1,405

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