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)
Balance (in shares) at Jul. 02, 2016		232.5
Beginning balance at Jul. 02, 2016	$ 689.3	$ 0.2	$ 70,059.8	$ (69,380.7)	$ 10.0
Increase (Decrease) in Stockholders' Equity
Net income (loss)	160.2			160.2
Comprehensive loss	(102.4)				(102.4)
Shares issued under employee stock plans, net of tax effects (in shares)		5.6
Shares issued under employee stock plans, net of tax effects	(1.9)		(1.9)
Stock-based compensation	33.2		33.2
Repurchases of common stock (in shares)		(10.5)
Repurchases of common stock	(92.0)			(92.0)
Issuance of senior convertible notes	99.9		99.9
Reacquisition of 2033 Notes equity component	(6.6)		(6.6)
Balance (in shares) at Jul. 01, 2017		227.6
Ending balance at Jul. 01, 2017	803.5	$ 0.2	70,184.4	(69,288.5)	(92.6)
Increase (Decrease) in Stockholders' Equity
Net income (loss)	(48.6)			(48.6)
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)
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
Cumulative adjustment from adoption of new accounting principal				(0.6)
Net income (loss)	5.4			5.4
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)
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)