Deferred Costs To Obtain Customer Contracts - Narratives (Details) - USD ($)	3 Months Ended		9 Months Ended
	Oct. 02, 2020	Sep. 27, 2019	Oct. 02, 2020	Sep. 27, 2019	Jan. 03, 2020
Capitalized Contract Cost [Line Items]
Deferred costs to obtain customer contracts	$ 47,300,000		$ 47,300,000		$ 45,400,000
Deferred commission
Capitalized Contract Cost [Line Items]
Impairment loss related to deferred commissions	0	$ 0	0	$ 0
Sales and marketing expense
Capitalized Contract Cost [Line Items]
Amortization expense related to deferred costs to obtain customer contracts	$ 5,700,000	$ 5,300,000	$ 16,800,000	$ 16,200,000