Share-based Compensation - Stock Option Activity (Detail) - Stock options - USD ($) $ / shares in Units, shares in Thousands	12 Months Ended
Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016
Stock Options (in thousands)
Beginning balance (in shares)	5,006	4,474	1,757
Granted (in shares)	1,182	734	2,976
Exercised (in shares)	(734)	(169)	(238)
Forfeited or expired (in shares)	(8)	(33)	(21)
Ending balance (in shares)	5,446	5,006	4,474	1,757
Weighted average exercise price
Exercisable shares, Ending balance	3,026
Vested or expected to vest (in shares)	5,446
Beginning balance (in USD per share)	$ 11.41	$ 10.32	$ 8.50
Granted (in USD per share)	14.67	17.50	11.15
Exercised (in USD per share)	10.04	9.21	7.29
Forfeited or expired (in USD per share)	10.64	10.28	9.99
Ending balance (in USD per share)	12.30	$ 11.41	$ 10.32	$ 8.50
Exercisable (in USD per share)	10.80
Vested or expected to vest (USD per share)	$ 12.30
Beginning balance (years)	7 years 3 months 19 days	8 years 1 month 6 days	8 years 9 months 18 days	8 years
Exercisable (years)	6 years 3 months 19 days
Vested or expected to vest (years)	7 years 3 months 19 days
Beginning balance	$ 26,952,300	$ 5,623,300	$ 4,373,800
Exercised	4,408,100	1,092,900	2,304,700
Ending balance	11,993,000	$ 26,952,300	$ 5,623,300	$ 4,373,800
Exercisable	9,983,700
Vested or expected to vest	$ 11,993,000

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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Period Type:	instant

- Definition

The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.