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)		0.4
Balance, end of period at Dec. 26, 2021		15.2
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	25.8			25.8
Issuance of common stock for employee stock purchase plan, options and warrants (in shares)			400,000
Issuance of common stock for employee stock purchase plan, options and warrants	5.9			5.9
Restricted stock issued and related taxes (in shares)			600,000
Restricted stock issued and related taxes	(9.1)			(9.1)
Gain on interest rate swap contract	0.0
Net income (loss)	(2.0)					(2.0)
Other comprehensive income (loss), net of tax	(0.8)				(0.8)
Balance, end of period (in shares) at Dec. 26, 2021			124,000,000.0
Balance, end of period at Dec. 26, 2021	945.1		$ 0.0	1,578.9	0.6	(634.4)
Redeemable Noncontrolling Interest
Net income (loss)		3.7
Acquisition of noncontrolling interest	4.5	(7.7)		4.5
Balance, end of period at Dec. 25, 2022		11.2
Increase (Decrease) in Stockholders' Equity
Stock-based compensation	26.3			26.3
Issuance of common stock for employee stock purchase plan, options and warrants (in shares)			500,000
Issuance of common stock for employee stock purchase plan, options and warrants	6.2			6.2
Restricted stock issued and related taxes (in shares)			1,000,000.0
Restricted stock issued and related taxes	(12.5)			(12.5)
Issuance of common stock (in shares)			300,000
Issuance of common stock	5.0			5.0
Gain on interest rate swap contract	0.0
Net income (loss)	(36.9)					(36.9)
Other comprehensive income (loss), net of tax	(1.4)				(1.4)
Acquisition of noncontrolling interest (in shares)			200,000
Acquisition of noncontrolling interest	$ 4.5	(7.7)		4.5
Balance, end of period (in shares) at Dec. 25, 2022	125,985,306		126,000,000.0
Balance, end of period at Dec. 25, 2022	$ 936.3		$ 0.0	1,608.4	(0.8)	(671.3)
Redeemable Noncontrolling Interest
Net income (loss)		11.3
Acquisition of noncontrolling interest	3.2			3.2
Balance, end of period at Dec. 31, 2023		$ 22.5
Increase (Decrease) in Stockholders' Equity
Stock-based compensation	25.3			25.3
Issuance of common stock for employee stock purchase plan, options and warrants (in shares)			800,000
Issuance of common stock for employee stock purchase plan, options and warrants	6.5			6.5
Restricted stock issued and related taxes (in shares)			700,000
Restricted stock issued and related taxes	(3.7)			(3.7)
Issuance of common stock for acquisitions (in shares)			1,000,000.0
Issuance of common stock for acquisitions	14.8			14.8
Gain on interest rate swap contract	0.7				0.7
Net income (loss)	(8.9)					(8.9)
Other comprehensive income (loss), net of tax	1.8				1.8
Acquisition of noncontrolling interest (in shares)			800,000
Acquisition of noncontrolling interest	$ 3.2			3.2
Balance, end of period (in shares) at Dec. 31, 2023	129,286,964		129,300,000
Balance, end of period at Dec. 31, 2023	$ 976.0		$ 0.0	$ 1,654.5	$ 1.7	$ (680.2)