CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY - USD ($) $ in Millions	Total	Redeemable Noncontrolling Interest	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit
Balance, beginning of period at Dec. 27, 2020		$ 14.8
Redeemable Noncontrolling Interest
Net income (loss)		0.3
Balance, end of period at Sep. 26, 2021		15.1
Balance, beginning of period (in shares) at Dec. 27, 2020			123,000,000.0
Balance, beginning of period at Dec. 27, 2020	$ 925.3		$ 0.0	$ 1,556.3	$ 1.4	$ (632.4)
Increase (Decrease) in Stockholders' Equity
Stock-based compensation	19.2			19.2
Issuance of common stock for employee stock purchase plan and stock options (in shares)			400,000
Issuance of common stock for employee stock purchase plan and stock options	5.9			5.9
Restricted stock issued and related taxes (in shares)			600,000
Restricted stock issued and related taxes	(9.1)			(9.1)
Issuance of common stock for acquisitions	0.0
Net income (loss)	0.6					0.6
Other comprehensive loss, net of tax	(0.1)				(0.1)
Balance, end of period (in shares) at Sep. 26, 2021			124,000,000.0
Balance, end of period at Sep. 26, 2021	941.8		$ 0.0	1,572.3	1.3	(631.8)
Balance, beginning of period at Jun. 27, 2021		14.6
Redeemable Noncontrolling Interest
Net income (loss)		0.5
Balance, end of period at Sep. 26, 2021		15.1
Balance, beginning of period (in shares) at Jun. 27, 2021			123,800,000
Balance, beginning of period at Jun. 27, 2021	935.9		$ 0.0	1,563.1	2.2	(629.4)
Increase (Decrease) in Stockholders' Equity
Stock-based compensation	6.4			6.4
Issuance of common stock for employee stock purchase plan and stock options (in shares)			200,000
Issuance of common stock for employee stock purchase plan and stock options	3.4			3.4
Restricted stock issued and related taxes	(0.6)			(0.6)
Net income (loss)	(2.4)					(2.4)
Other comprehensive loss, net of tax	(0.9)				(0.9)
Balance, end of period (in shares) at Sep. 26, 2021			124,000,000.0
Balance, end of period at Sep. 26, 2021	$ 941.8		$ 0.0	1,572.3	1.3	(631.8)
Balance, beginning of period at Dec. 26, 2021		15.2
Redeemable Noncontrolling Interest
Net income (loss)		0.3
Balance, end of period at Sep. 25, 2022		7.8
Balance, beginning of period (in shares) at Dec. 26, 2021	123,987,424		124,000,000.0
Balance, beginning of period at Dec. 26, 2021	$ 945.1		$ 0.0	1,578.9	0.6	(634.4)
Increase (Decrease) in Stockholders' Equity
Stock-based compensation	19.9			19.9
Issuance of common stock for employee stock purchase plan and stock options (in shares)			400,000
Issuance of common stock for employee stock purchase plan and stock options	6.1			6.1
Restricted stock issued and related taxes (in shares)			1,000,000.0
Restricted stock issued and related taxes	(12.3)			(12.3)
Issuance of common stock for acquisitions (in shares)			300,000
Issuance of common stock for acquisitions	5.0			5.0
Net income (loss)	(28.6)					(28.6)
Other comprehensive loss, net of tax	(4.3)				(4.3)
Changes in noncontrolling interest (in shares)			200,000
Changes in noncontrolling interest	$ 4.5	(7.7)		4.5
Balance, end of period (in shares) at Sep. 25, 2022	125,947,889		125,900,000
Balance, end of period at Sep. 25, 2022	$ 935.4		$ 0.0	1,602.1	(3.7)	(663.0)
Balance, beginning of period at Jun. 26, 2022		7.8
Balance, end of period at Sep. 25, 2022		$ 7.8
Balance, beginning of period (in shares) at Jun. 26, 2022			125,600,000
Balance, beginning of period at Jun. 26, 2022	938.1		$ 0.0	1,593.1	0.0	(655.0)
Increase (Decrease) in Stockholders' Equity
Stock-based compensation	6.6			6.6
Issuance of common stock for employee stock purchase plan and stock options (in shares)			300,000
Issuance of common stock for employee stock purchase plan and stock options	3.2			3.2
Restricted stock issued and related taxes	(0.8)			(0.8)
Net income (loss)	(8.0)					(8.0)
Other comprehensive loss, net of tax	$ (3.7)				(3.7)
Balance, end of period (in shares) at Sep. 25, 2022	125,947,889		125,900,000
Balance, end of period at Sep. 25, 2022	$ 935.4		$ 0.0	$ 1,602.1	$ (3.7)	$ (663.0)