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Consolidated Statements of Stockholders Equity - USD ($) $ in Millions	Total	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]	Accumulated Other Comprehensive Income [Member]	Accumulated Other Comprehensive Income [Member] As Adjusted [Member]	Retained Earnings [Member]	Retained Earnings [Member] As Adjusted [Member]
Balance, value at Jun. 24, 2017	$ 740.2	$ 757.6	$ 0.1	$ 0.1	$ 1,004.8	$ 1,005.8	$ (980.3)	$ (980.3)	$ 1.5	$ 1.5	$ 714.1	$ 730.5
Balance, shares at Jun. 24, 2017			60,579,911	60,579,911
Cumulative effect of changes in accounting principles for share-based compensation at Jun. 24, 2017	25.7		$ 0.0		1.0		0.0		0.0		24.7
Cumulative effect of changes in accounting principles for income taxes: intra-entity transfers of assets other than inventory at Jun. 24, 2017	(8.3)		0.0		0.0		0.0		0.0		(8.3)
Net income/(loss)	(124.1)		0.0		0.0		0.0		0.0		(124.1)
Issuance of common stock for share-based award compensation plans	32.3		$ 0.0		32.3		0.0		0.0		0.0
Issuance of common stock for share-based award compensation plans, shares			1,583,102
Issuance of common stock for acquisition	39.1		$ 0.0		39.1		0.0		0.0		0.0
Issuance of common stock for acquisition, shares			726,666
Payroll taxes for deferred stock units	(5.4)		$ 0.0		(5.4)		0.0		0.0		0.0
Purchases of treasury stock	(93.6)		0.0		0.0		(93.6)		0.0		0.0
Share-based compensation	71.3		0.0		71.3		0.0		0.0		0.0
Issuance of convertible debt	52.1		0.0		52.1		0.0		0.0		0.0
Balance, value at Jun. 30, 2018	729.3		$ 0.1		1,195.2		(1,073.9)		1.5		606.4
Balance, shares at Jun. 30, 2018			62,889,679
Net income/(loss)	(22.9)		$ 0.0		0.0		0.0		0.0		(22.9)
Other comprehensive income	(1.5)		0.0		0.0		0.0		(1.5)		0.0
Issuance of common stock for share-based award compensation plans	21.3		$ 0.0		21.3		0.0		0.0		0.0
Issuance of common stock for share-based award compensation plans, shares			1,394,269
Payroll taxes for deferred stock units	(9.4)		$ 0.0		(9.4)		0.0		0.0		0.0
Purchases of treasury stock	(118.5)		0.0		0.0		(118.5)		0.0		0.0
Share-based compensation	59.0		0.0		59.0		0.0		0.0		0.0
Balance, value at Jun. 29, 2019	657.3	$ 656.4	$ 0.1	$ 0.1	1,266.1	$ 1,266.1	(1,192.4)	$ (1,192.4)	0.0	$ 0.0	583.5	$ 582.6
Balance, shares at Jun. 29, 2019			64,283,948	64,283,948
Cumulative effect of changes in accounting principles for leases at Jun. 29, 2019	(0.9)		$ 0.0		0.0		0.0		0.0		(0.9)
Net income/(loss)	118.8		0.0		0.0		0.0		0.0		118.8
Issuance of common stock for share-based award compensation plans	34.5		$ 0.0		34.5		0.0		0.0		0.0
Issuance of common stock for share-based award compensation plans, shares			1,587,700
Payroll taxes for deferred stock units	(9.7)		$ 0.0		(9.7)		0.0		0.0		0.0
Purchases of treasury stock	(30.2)		0.0		0.0		(30.2)		0.0		0.0
Share-based compensation	49.3		0.0		49.3		0.0		0.0		0.0
Balance, value at Jun. 27, 2020	$ 819.1		$ 0.1		$ 1,340.2		$ (1,222.6)		$ 0.0		$ 701.4
Balance, shares at Jun. 27, 2020			65,871,648

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