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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)
Beginning balance at Jun. 27, 2015	$ 1,101.4	$ 0.2	$ 70,022.7	$ (68,873.5)	$ (48.0)
Balance (in shares) at Jun. 27, 2015		235.3
Increase (Decrease) in Stockholders' Equity
Net (loss) income	(99.2)			(99.2)
Distribution of Lumentum Holdings Inc.	(371.3)			(363.5)	(7.8)
Comprehensive income (loss)	65.8				65.8
Shares issued under employee stock plans, net of tax effects	(6.9)		(6.9)
Shares issued under employee stock plans, net of tax effects (in shares)		4.5
Stock-based compensation	44.0		44.0
Repurchases of common stock	(44.5)			(44.5)
Repurchases of common stock (in shares)		(7.3)
Balance (in shares) at Jul. 02, 2016		232.5
Ending balance at Jul. 02, 2016	689.3	$ 0.2	70,059.8	(69,380.7)	10.0
Increase (Decrease) in Stockholders' Equity
Net (loss) income	166.9			166.9
Comprehensive income (loss)	(102.4)				(102.4)
Shares issued under employee stock plans, net of tax effects	(1.9)		(1.9)
Shares issued under employee stock plans, net of tax effects (in shares)		5.6
Stock-based compensation	33.2		33.2
Repurchases of common stock	(92.0)			(92.0)
Repurchases of common stock (in shares)		(10.5)
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	786.4	$ 0.2	70,184.4	(69,305.8)	(92.4)
Increase (Decrease) in Stockholders' Equity
Cumulative adjustment from adoption of ASU 2016-09 (Topic 718)	0.0		0.6	(0.6)
Net (loss) income	(46.0)			(46.0)
Comprehensive income (loss)	(10.0)
Other comprehensive loss	(10.0)				(10.0)
Shares issued under employee stock plans, net of tax effects	(8.4)		(8.4)
Shares issued under employee stock plans, net of tax effects (in shares)		3.5
Stock-based compensation	30.5		30.5
Repurchases of common stock	(40.9)			(40.9)
Repurchases of common stock (in shares)		(4.4)
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	$ 720.7	$ 0.2	$ 70,216.2	$ (69,393.3)	$ (102.4)