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Related Party - Additional Information (Detail) - USD ($) $ in Thousands			3 Months Ended			9 Months Ended
	Dec. 15, 2019	Oct. 18, 2015	Sep. 26, 2020	Jun. 27, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019	Dec. 28, 2019
Related Party Transaction [Line Items]
Initial agreement term		5 years
Ms. Winfrey
Related Party Transaction [Line Items]
Fully vested option to purchase shares of common stock	3,276
Dividend yield						0.00%
Volatility rate						63.68%
Risk-fee interest rate						0.41%
Accounts payable to related parties			$ 198			$ 198		$ 72
Number of shares purchased from related party						604,000
Stock options exercised						297,000
Ms. Winfrey and her related entities
Related Party Transaction [Line Items]
Related Party Transaction, service provided by related party			305		$ 662	$ 2,066	$ 2,665
Related Party, advertising expenses					$ 330
Related Party Transaction, actual costs reimbursed			$ 2			$ 1,653
Selling, General and Administrative Expenses | Ms. Winfrey
Related Party Transaction [Line Items]
Compensation expense				$ 32,686

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Amount for accounts payable to related parties.

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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