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. 30, 2018		$ 0.0
Redeemable Noncontrolling Interest
Net income (loss)		0.1
Changes in noncontrolling interest		14.9
Balance, end of period at Dec. 29, 2019		15.0
Balance, beginning of period (in shares) at Dec. 30, 2018			103,800,000
Balance, beginning of period at Dec. 30, 2018	$ 519.3		$ 0.0	$ 1,244.5	$ (0.7)	$ (724.5)
Increase (Decrease) in Stockholders' Equity
Stock-based compensation	11.0			11.0
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	4.9			4.9
Restricted stock issued and related taxes (in shares)			200,000
Restricted stock issued and related taxes	(0.9)			(0.9)
Issuance of common stock for acquisitions (in shares)			1,800,000
Issuance of common stock for acquisitions	27.0			27.0
Net income (loss)	12.5					12.5
Other comprehensive income (loss), net of tax	0.3				0.3
Balance, end of period (in shares) at Dec. 29, 2019			106,600,000
Balance, end of period at Dec. 29, 2019	574.1		$ 0.0	1,286.5	(0.4)	(712.0)
Redeemable Noncontrolling Interest
Net income (loss)		(0.2)
Balance, end of period at Dec. 27, 2020		14.8
Increase (Decrease) in Stockholders' Equity
Stock-based compensation	21.0			21.0
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	4.8			4.8
Restricted stock issued and related taxes (in shares)			200,000
Restricted stock issued and related taxes	(1.4)			(1.4)
Issuance of common stock (in shares)			15,800,000
Issuance of common stock	245.4			245.4
Net income (loss)	79.6					79.6
Other comprehensive income (loss), net of tax	$ 1.8				1.8
Balance, end of period (in shares) at Dec. 27, 2020	123,047,147		123,000,000.0
Balance, end of period at Dec. 27, 2020	$ 925.3		$ 0.0	1,556.3	1.4	(632.4)
Redeemable Noncontrolling Interest
Net income (loss)		0.4
Balance, end of period at Dec. 26, 2021		$ 15.2
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)
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	123,987,424		124,000,000.0
Balance, end of period at Dec. 26, 2021	$ 945.1		$ 0.0	$ 1,578.9	$ 0.6	$ (634.4)