Stock-Based Compensation - Stock options activity (Details) - Stock options $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 28, 2019 USD ($) $ / shares shares
Number of options
Outstanding at the beginning of the year (in shares) | shares	137
Outstanding at the end of the year (in shares) | shares	137
Vested and expected to vest at the end of the year (in shares) | shares	43
Exercisable at the end of the year (in shares) | shares	93
Weighted-Average Exercise Price
Outstanding at the beginning of the year (in dollars per share) | $ / shares	$ 39.47
Outstanding at the end of the year (in dollars per share) | $ / shares	39.47
Vested and expected to vest at the end of the year (in dollars per share) | $ / shares	40.39
Exercisable at the end of the year (in dollars per share) | $ / shares	$ 39.04
Weighted-Average Remaining Contractual Term (In years)
Outstanding at the end of the year	6 years 1 month 17 days
Vested and expected to vest at the end of the year	6 years 1 month 13 days
Exercisable at the end of the year	6 years 1 month 17 days
Aggregate Intrinsic Value
Outstanding at the end of the year (in dollars) | $	$ 10,515
Vested and expected to vest at the end of the year (in dollars) | $	3,265
Options exercisable at the end of the year (in dollars) | $	$ 7,224