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. 26, 2021		$ 15.2
Redeemable Noncontrolling Interest
Net loss		0.3
Balance, end of period at Sep. 25, 2022		7.8
Balance, beginning of period (in shares) at Dec. 26, 2021			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
Gain on interest rate swap contract	0.0
Net income (loss)	(28.6)					(28.6)
Other comprehensive income (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			125,900,000
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)
Gain on interest rate swap contract	0.0
Net income (loss)	(8.0)					(8.0)
Other comprehensive income (loss), net of tax	(3.7)				(3.7)
Balance, end of period (in shares) at Sep. 25, 2022			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 Dec. 25, 2022		11.2
Redeemable Noncontrolling Interest
Net loss		8.1
Balance, end of period at Oct. 01, 2023		19.3
Balance, beginning of period (in shares) at Dec. 25, 2022	125,985,306		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 on interest rate swap contract	3.2				3.2
Net income (loss)	(11.3)					(11.3)
Other comprehensive income (loss), 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	128,072,596		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 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 on interest rate swap contract	1.4				1.4
Net income (loss)	(1.6)					(1.6)
Other comprehensive income (loss), net of tax	$ (1.8)				(1.8)
Balance, end of period (in shares) at Oct. 01, 2023	128,072,596		128,100,000
Balance, end of period at Oct. 01, 2023	$ 953.4		$ 0.0	$ 1,633.5	$ 2.5	$ (682.6)