Consolidated Statements of Stockholders' Equity (Deficit) - USD ($) shares in Millions, $ in Millions	Total	Common Stock	Additional Paid-In Capital	Retained Earnings (Deficit)	Accumulated Other Comprehensive (Loss) Income
Beginning balance (in shares) at Dec. 29, 2019		133.6
Beginning balance at Dec. 29, 2019	$ (137.2)	$ 1.3	$ 3.5	$ (127.1)	$ (14.9)
Increase (Decrease) in Stockholders' Equity
Net income	77.9			77.9
Foreign currency translation gain (loss)	(5.7)				(5.7)
Stock-based compensation expense	4.5		4.5
Common stock issued for the exercise and vesting of stock-based awards (in shares)		0.6
Common stock issued for the exercise and vesting of stock-based awards	1.1		1.1
Withholding taxes on stock-based awards (in shares)		(0.2)
Withholding taxes on stock-based awards	(8.0)		(8.0)
Ending balance (in shares) at Jun. 28, 2020		134.0
Ending balance at Jun. 28, 2020	(67.4)	$ 1.3	1.1	(49.2)	(20.6)
Beginning balance (in shares) at Mar. 29, 2020		133.9
Beginning balance at Mar. 29, 2020	(103.6)	$ 1.3	0.0	(82.4)	(22.5)
Increase (Decrease) in Stockholders' Equity
Net income	33.2			33.2
Foreign currency translation gain (loss)	1.9				1.9
Stock-based compensation expense	2.4		2.4
Common stock issued for the exercise and vesting of stock-based awards (in shares)		0.1
Common stock issued for the exercise and vesting of stock-based awards	0.3		0.3
Withholding taxes on stock-based awards	(1.6)		(1.6)
Ending balance (in shares) at Jun. 28, 2020		134.0
Ending balance at Jun. 28, 2020	$ (67.4)	$ 1.3	1.1	(49.2)	(20.6)
Beginning balance (in shares) at Dec. 27, 2020	134.5	134.5
Beginning balance at Dec. 27, 2020	$ 69.4	$ 1.3	12.0	67.7	(11.6)
Increase (Decrease) in Stockholders' Equity
Net income	155.4			155.4
Foreign currency translation gain (loss)	6.0				6.0
Stock-based compensation expense	5.4		5.4
Common stock issued for the exercise and vesting of stock-based awards (in shares)		0.4
Common stock issued for the exercise and vesting of stock-based awards	0.4		0.4
Common stock issued for employee stock purchase plan	0.8		0.8
Withholding taxes on stock-based awards (in shares)		(0.1)
Withholding taxes on stock-based awards	$ (7.2)		(7.2)
Ending balance (in shares) at Jun. 27, 2021	134.8	134.8
Ending balance at Jun. 27, 2021	$ 230.2	$ 1.3	11.4	223.1	(5.6)
Beginning balance (in shares) at Mar. 28, 2021		134.8
Beginning balance at Mar. 28, 2021	142.2	$ 1.3	9.3	140.2	(8.6)
Increase (Decrease) in Stockholders' Equity
Net income	82.9			82.9
Foreign currency translation gain (loss)	3.0				3.0
Stock-based compensation expense	2.6		2.6
Common stock issued for the exercise and vesting of stock-based awards (in shares)		0.0
Common stock issued for the exercise and vesting of stock-based awards	0.3		0.3
Common stock issued for employee stock purchase plan	0.4		0.4
Withholding taxes on stock-based awards	$ (1.2)		(1.2)
Ending balance (in shares) at Jun. 27, 2021	134.8	134.8
Ending balance at Jun. 27, 2021	$ 230.2	$ 1.3	$ 11.4	$ 223.1	$ (5.6)