CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Millions, $ in Millions	Total	Common Stock	Additional Paid-In Capital	Accumulated Deficit	Accumulated Other Comprehensive Income (Loss)	Cumulative Effect, Period of Adoption, Adjustment	Cumulative Effect, Period of Adoption, Adjustment Additional Paid-In Capital	Cumulative Effect, Period of Adoption, Adjustment Accumulated Deficit
Balance (in shares) at Jul. 01, 2017		227.6
Beginning balance at Jul. 01, 2017	$ 803.5	$ 0.2	$ 70,184.4	$ (69,288.5)	$ (92.6)
Beginning balance (Accounting Standards Update 2016-09) at Jul. 01, 2017						$ 0.0	$ 0.6	$ (0.6)
Increase (Decrease) in Stockholders' Equity
Net income (loss)	(48.6)			(48.6)
Other Comprehensive loss	(10.3)				(10.3)
Shares issued under employee stock plans, net of tax effects (in shares)		3.5
Shares issued under employee stock plans, net of tax effects	(8.4)		(8.4)
Stock-based compensation	$ 30.5		30.5
Repurchases of common stock (in shares)	(4.4)	(4.4)
Repurchases of common stock	$ (40.9)			(40.9)
Issuance of senior convertible notes	34.6		34.6
Reacquisition of 2033 Notes equity component	(25.5)		(25.5)
Balance (in shares) at Jun. 30, 2018		226.7
Ending balance at Jun. 30, 2018	734.9	$ 0.2	70,216.2	(69,378.6)	(102.9)
Increase (Decrease) in Stockholders' Equity
Net income (loss)	5.4			5.4
Other Comprehensive loss	(31.7)				(31.7)
Shares issued under employee stock plans, net of tax effects (in shares)		3.2
Shares issued under employee stock plans, net of tax effects	(10.1)		(10.1)
Stock-based compensation	$ 38.6		38.6
Repurchases of common stock (in shares)	(1.1)	(1.1)
Repurchases of common stock	$ (11.3)			(11.3)
Balance (in shares) at Jun. 29, 2019		228.8
Ending balance at Jun. 29, 2019	725.8	$ 0.2	70,244.7	(69,384.5)	(134.6)
Ending balance (Accounting Standards Update 2016-02) at Jun. 29, 2019						$ 3.0		$ 3.0
Increase (Decrease) in Stockholders' Equity
Net income (loss)	28.7			28.7
Other Comprehensive loss	(31.3)				(31.3)
Shares issued under employee stock plans, net of tax effects (in shares)		3.2
Shares issued under employee stock plans, net of tax effects	(15.3)		(15.3)
Stock-based compensation	$ 44.9		44.9
Repurchases of common stock (in shares)	(3.7)	(3.7)
Repurchases of common stock	$ (44.4)			(44.4)
Balance (in shares) at Jun. 27, 2020		228.3
Ending balance at Jun. 27, 2020	$ 711.4	$ 0.2	$ 70,274.3	$ (69,397.2)	$ (165.9)