Recently Issued Accounting Pronouncements (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Mar. 30, 2019	Mar. 31, 2018	Mar. 30, 2019	Mar. 31, 2018	Dec. 29, 2018	Jun. 30, 2018	Dec. 30, 2017	Jul. 01, 2017
ASSETS
Accounts receivable, net	$ 223.1		$ 223.1			$ 218.6
Prepayments and other assets	53.9		53.9			56.3
Deferred income taxes	110.1		110.1			114.3
Other non-current assets	17.8		17.8			15.4
Total assets	1,809.5		1,809.5			2,026.8
LIABILITIES AND STOCKHOLDERS’ EQUITY
Deferred revenue	61.3		61.3			60.6
Accrued payroll and related expenses	52.9		52.9			52.8
Other current liabilities	79.5		79.5			78.9
Other non-current liabilities	223.0		223.0			180.8
Total stockholders’ equity	728.3	$ 776.1	728.3	$ 776.1	$ 710.1	734.9	$ 770.3	$ 803.5
Total liabilities and stockholders’ equity	1,809.5		1,809.5			2,026.8
Revenues:
Total net revenue	265.2	218.7	840.6	615.0
Cost of revenues:
Amortization of acquired technologies	7.9	6.2	25.8	14.4
Total cost of revenue	111.7	95.4	358.7	259.6
Gross profit	153.5	123.3	481.9	355.4
Income from operations	7.9	0.4	39.6	14.0
Loss before taxes	0.8	(7.6)	17.5	(15.1)
Provision for income taxes	5.6	3.1	22.2	4.3
Net loss	$ (4.8)	$ (10.7)	$ (7.1)	$ (19.4)
Net loss per common share:
Basic and dilutive (in dollars per share)	$ (0.02)	$ (0.05)	$ (0.03)	$ (0.09)
Shares used in per share calculations:
Basic and dilutive (in shares)	228.3	226.3	227.9	227.3
As Reported
ASSETS
Accounts receivable, net						217.5
Prepayments and other assets						54.8
Deferred income taxes						114.5
Other non-current assets						13.6
Total assets						2,022.6
LIABILITIES AND STOCKHOLDERS’ EQUITY
Deferred revenue						71.9
Accrued payroll and related expenses						51.4
Other current liabilities						77.0
Other non-current liabilities						182.8
Total stockholders’ equity						720.7
Total liabilities and stockholders’ equity						2,022.6
Revenues:
Total net revenue		$ 219.4		$ 616.4
Cost of revenues:
Amortization of acquired technologies		6.2		14.4
Total cost of revenue		95.7		260.4
Gross profit		123.7		356.0
Income from operations		0.4		14.1
Loss before taxes		(7.6)		(15.0)
Provision for income taxes		1.1		2.2
Net loss		$ (8.7)		$ (17.2)
Net loss per common share:
Basic and dilutive (in dollars per share)		$ (0.04)		$ (0.08)
Shares used in per share calculations:
Basic and dilutive (in shares)		226.3		227.3
Accounting Standards Update 2014-09 | Adjustment
ASSETS
Accounts receivable, net						1.1
Prepayments and other assets						1.5
Deferred income taxes						(0.2)
Other non-current assets						1.8
Total assets						4.2
LIABILITIES AND STOCKHOLDERS’ EQUITY
Deferred revenue						(11.3)
Accrued payroll and related expenses						1.4
Other current liabilities						1.9
Other non-current liabilities						(2.0)
Total stockholders’ equity						14.2
Total liabilities and stockholders’ equity						$ 4.2
Revenues:
Total net revenue		$ (0.7)		$ (1.4)
Cost of revenues:
Amortization of acquired technologies		0.0		0.0
Total cost of revenue		(0.3)		(0.8)
Gross profit		(0.4)		(0.6)
Income from operations		0.0		(0.1)
Loss before taxes		0.0		(0.1)
Provision for income taxes		2.0		2.1
Net loss		$ (2.0)		$ (2.2)
Net loss per common share:
Basic and dilutive (in dollars per share)		$ (0.01)		$ (0.01)
Shares used in per share calculations:
Basic and dilutive (in shares)
Product
Revenues:
Total net revenue	$ 232.1	$ 193.2	$ 746.0	$ 539.6
Cost of revenues:
Cost of goods and services sold	91.6	77.3	295.5	209.4
Product | As Reported
Revenues:
Total net revenue		197.2		546.6
Cost of revenues:
Cost of goods and services sold		79.2		212.3
Product | Accounting Standards Update 2014-09 | Adjustment
Revenues:
Total net revenue		(4.0)		(7.0)
Cost of revenues:
Cost of goods and services sold		(1.9)		(2.9)
Service
Revenues:
Total net revenue	33.1	25.5	94.6	75.4
Cost of revenues:
Cost of goods and services sold	$ 12.2	11.9	$ 37.4	35.8
Service | As Reported
Revenues:
Total net revenue		22.2		69.8
Cost of revenues:
Cost of goods and services sold		10.3		33.7
Service | Accounting Standards Update 2014-09 | Adjustment
Revenues:
Total net revenue		3.3		5.6
Cost of revenues:
Cost of goods and services sold		$ 1.6		$ 2.1