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Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Millions	Total	Cumulative Effect of Changes in Accounting Principles [Member]	As Adjusted [Member]	Common Stock [Member]	Common Stock [Member] As Adjusted [Member]	Additional Paid-in Capital [Member]	Additional Paid-in Capital [Member] As Adjusted [Member]	Treasury Stock [Member]	Treasury Stock [Member] As Adjusted [Member]	Retained Earnings [Member]	Retained Earnings [Member] Cumulative Effect of Changes in Accounting Principles [Member]	Retained Earnings [Member] As Adjusted [Member]
Balance, value at Jun. 29, 2019	$ 657.3	$ (0.9)	$ 656.4	$ 0.1	$ 0.1	$ 1,266.1	$ 1,266.1	$ (1,192.4)	$ (1,192.4)	$ 583.5	$ (0.9)	$ 582.6
Balance, shares at Jun. 29, 2019				64,283,948	64,283,948
Net income/(loss)	4.0									4.0
Issuance of common stock for share- based award compensation plans	1.7					1.7
Issuance of common stock for share-based award compensation plans, shares				209,110
Payroll taxes for deferred stock units	(1.5)					(1.5)
Purchases of treasury stock	(17.0)							(17.0)
Share-based compensation	11.2					11.2
Balance, value at Sep. 28, 2019	654.8			$ 0.1		1,277.5		(1,209.4)		586.6
Balance, shares at Sep. 28, 2019				64,493,058
Net income/(loss)	19.8									19.8
Issuance of common stock for share- based award compensation plans	11.8					11.8
Issuance of common stock for share-based award compensation plans, shares				895,755
Payroll taxes for deferred stock units	(7.2)					(7.2)
Share-based compensation	12.1					12.1
Balance, value at Dec. 28, 2019	691.3			$ 0.1		1,294.2		(1,209.4)		606.4
Balance, shares at Dec. 28, 2019				65,388,813
Net income/(loss)	5.0									5.0
Issuance of common stock for share- based award compensation plans	16.5					16.5
Issuance of common stock for share-based award compensation plans, shares				363,402
Payroll taxes for deferred stock units	(0.6)					(0.6)
Purchases of treasury stock	(13.1)							(13.1)
Share-based compensation	13.8					13.8
Balance, value at Mar. 28, 2020	712.9			$ 0.1		1,323.9		(1,222.5)		611.4
Balance, shares at Mar. 28, 2020				65,752,215
Balance, value at Jun. 27, 2020	819.1		819.1		$ 0.1		1,340.2		(1,222.6)			701.4
Balance, shares at Jun. 27, 2020					65,871,648
Net income/(loss)	(2.8)									(2.8)
Issuance of common stock for share- based award compensation plans	10.4					10.4
Issuance of common stock for share-based award compensation plans, shares				296,917
Payroll taxes for deferred stock units	(5.6)					(5.6)
Share-based compensation attributable to acquisition	3.2					3.2
Share-based compensation	14.4					14.4
Balance, value at Sep. 26, 2020	838.7			$ 0.1		1,362.6		(1,222.6)		698.6
Balance, shares at Sep. 26, 2020				66,168,565
Balance, value at Jun. 27, 2020	819.1		$ 819.1		$ 0.1		$ 1,340.2		$ (1,222.6)			$ 701.4
Balance, shares at Jun. 27, 2020					65,871,648
Net income/(loss)	60.6
Balance, value at Mar. 27, 2021	932.6			$ 0.1		1,393.1		(1,222.6)		762.0
Balance, shares at Mar. 27, 2021				66,929,462
Balance, value at Sep. 26, 2020	838.7			$ 0.1		1,362.6		(1,222.6)		698.6
Balance, shares at Sep. 26, 2020				66,168,565
Net income/(loss)	49.6									49.6
Issuance of common stock for share- based award compensation plans	0.8					0.8
Issuance of common stock for share-based award compensation plans, shares				508,776
Payroll taxes for deferred stock units	(20.2)					(20.2)
Share-based compensation	19.1					19.1
Balance, value at Dec. 26, 2020	888.0			$ 0.1		1,362.3		(1,222.6)		748.2
Balance, shares at Dec. 26, 2020				66,677,341
Net income/(loss)	13.8									13.8
Issuance of common stock for share- based award compensation plans	15.7					15.7
Issuance of common stock for share-based award compensation plans, shares				252,121
Payroll taxes for deferred stock units	(1.2)					(1.2)
Share-based compensation	16.3					16.3
Balance, value at Mar. 27, 2021	$ 932.6			$ 0.1		$ 1,393.1		$ (1,222.6)		$ 762.0
Balance, shares at Mar. 27, 2021				66,929,462

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