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. 25, 2022		$ 11.2
Redeemable Noncontrolling Interest
Net income (loss)		8.1
Balance, end of period at Oct. 01, 2023		19.3
Balance, beginning of period (in shares) at Dec. 25, 2022			126,000,000.0
Balance, beginning of period at Dec. 25, 2022	$ 936.3		$ 0.0	$ 1,608.4	$ (0.8)	$ (671.3)
Increase (Decrease) in Stockholders' Equity
Stock-based compensation	19.0			19.0
Issuance of common stock for employee stock purchase plan and stock options (in shares)			800,000
Issuance of common stock for employee stock purchase plan and stock options	6.5			6.5
Restricted stock issued and related taxes (in shares)			500,000
Restricted stock issued and related taxes	(3.6)			(3.6)
Gain (loss) on interest rate swap contract	3.2				3.2
Net income (loss)	(11.3)					(11.3)
Other comprehensive (loss) income, net of tax	0.1				0.1
Changes in noncontrolling interest (in shares)			800,000
Changes in noncontrolling interest	3.2			3.2
Balance, end of period (in shares) at Oct. 01, 2023			128,100,000
Balance, end of period at Oct. 01, 2023	953.4		$ 0.0	1,633.5	2.5	(682.6)
Balance, beginning of period at Jun. 25, 2023		14.7
Redeemable Noncontrolling Interest
Net income (loss)		4.6
Balance, end of period at Oct. 01, 2023		19.3
Balance, beginning of period (in shares) at Jun. 25, 2023			127,600,000
Balance, beginning of period at Jun. 25, 2023	945.6		$ 0.0	1,623.7	2.9	(681.0)
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)			500,000
Issuance of common stock for employee stock purchase plan and stock options	3.6			3.6
Restricted stock issued and related taxes	(0.2)			(0.2)
Gain (loss) on interest rate swap contract	1.4				1.4
Net income (loss)	(1.6)					(1.6)
Other comprehensive (loss) income, net of tax	(1.8)				(1.8)
Balance, end of period (in shares) at Oct. 01, 2023			128,100,000
Balance, end of period at Oct. 01, 2023	$ 953.4		$ 0.0	1,633.5	2.5	(682.6)
Balance, beginning of period at Dec. 31, 2023		22.5
Balance, end of period at Sep. 29, 2024		0.0
Balance, beginning of period (in shares) at Dec. 31, 2023	129,286,964		129,300,000
Balance, beginning of period at Dec. 31, 2023	$ 976.0		$ 0.0	1,654.5	1.7	(680.2)
Increase (Decrease) in Stockholders' Equity
Stock-based compensation	23.0			23.0
Issuance of common stock for employee stock purchase plan and stock options (in shares)			500,000
Issuance of common stock for employee stock purchase plan and stock options	8.2			8.2
Restricted stock issued and related taxes (in shares)			1,400,000
Restricted stock issued and related taxes	(17.3)			(17.3)
Issuance of common stock for equity raise (in shares)			19,200,000
Issuance of common stock for equity raise	330.7		$ 0.2	330.5
Gain (loss) on interest rate swap contract	(1.3)				(1.3)
Net income (loss)	12.4					12.4
Other comprehensive (loss) income, net of tax	(0.1)				(0.1)
Changes in noncontrolling interest (in shares)			600,000
Changes in noncontrolling interest	$ 11.3	(22.5)		11.3
Balance, end of period (in shares) at Sep. 29, 2024	151,015,662		151,000,000.0
Balance, end of period at Sep. 29, 2024	$ 1,342.9		$ 0.2	2,010.2	0.3	(667.8)
Balance, beginning of period at Jun. 30, 2024		0.0
Balance, end of period at Sep. 29, 2024		$ 0.0
Balance, beginning of period (in shares) at Jun. 30, 2024			150,700,000
Balance, beginning of period at Jun. 30, 2024	1,329.3		$ 0.2	1,998.6	1.5	(671.0)
Increase (Decrease) in Stockholders' Equity
Stock-based compensation	7.2			7.2
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	4.6			4.6
Restricted stock issued and related taxes	(0.2)			(0.2)
Gain (loss) on interest rate swap contract	(2.6)				(2.6)
Net income (loss)	3.2					3.2
Other comprehensive (loss) income, net of tax	$ 1.4				1.4
Balance, end of period (in shares) at Sep. 29, 2024	151,015,662		151,000,000.0
Balance, end of period at Sep. 29, 2024	$ 1,342.9		$ 0.2	$ 2,010.2	$ 0.3	$ (667.8)