Recently Issued Accounting Pronouncements (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Dec. 29, 2018	Dec. 30, 2017	Dec. 29, 2018	Dec. 30, 2017	Jun. 30, 2018
ASSETS
Accounts receivable, net	$ 248.3		$ 248.3		$ 218.6
Prepayments and other assets	51.7		51.7		56.3
Deferred income taxes	113.2		113.2		114.3
Other non-current assets	20.5		20.5		15.4
Total assets	1,798.2		1,798.2		2,026.8
LIABILITIES AND STOCKHOLDERS’ EQUITY
Deferred revenue	59.2		59.2		60.6
Accrued payroll and related expenses	61.6		61.6		52.8
Other current liabilities	88.2		88.2		78.9
Total stockholders’ equity	221.9		221.9		180.8
Total liabilities and stockholders’ equity	710.1		710.1		734.9
Total liabilities and stockholders’ equity	1,798.2		1,798.2		2,026.8
Revenues:
Total net revenue	306.9	$ 205.4	575.4	$ 396.3
Cost of revenues:
Amortization of acquired technologies	8.5	4.1	17.9	8.2
Total cost of revenue	128.9	86.0	247.0	164.2
Gross profit	178.0	119.4	328.4	232.1
Income from operations	32.9	6.9	31.7	13.6
Loss before taxes	26.3	(1.9)	16.7	(7.5)
Provision for (benefit from) income taxes	10.9	(0.8)	16.6	1.2
Net income (loss)	13.0	$ (1.1)	(2.3)	$ (8.7)
Net loss per common share:
Basic and dilutive (in dollars per share)		$ 0.00		$ (0.04)
Shares used in per share calculations:
Basic and dilutive (in shares)		227.4		227.7
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
Total stockholders’ equity					182.8
Total liabilities and stockholders’ equity					720.7
Total liabilities and stockholders’ equity					2,022.6
Revenues:
Total net revenue		$ 201.8		$ 397.0
Cost of revenues:
Amortization of acquired technologies		4.1		8.2
Total cost of revenue		85.7		164.7
Gross profit		116.1		232.3
Income from operations		3.7		13.7
Loss before taxes		(5.1)		(7.4)
Provision for (benefit from) income taxes		(1.4)		1.1
Net income (loss)		$ (3.7)		$ (8.5)
Net loss per common share:
Basic and dilutive (in dollars per share)		$ (0.02)		$ (0.04)
Shares used in per share calculations:
Basic and dilutive (in shares)		227.4		227.7
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
Total stockholders’ equity					(2.0)
Total liabilities and stockholders’ equity					14.2
Total liabilities and stockholders’ equity					$ 4.2
Revenues:
Total net revenue		$ 3.6		$ (0.7)
Cost of revenues:
Amortization of acquired technologies		0.0		0.0
Total cost of revenue		0.3		(0.5)
Gross profit		3.3		(0.2)
Income from operations		3.2		(0.1)
Loss before taxes		3.2		(0.1)
Provision for (benefit from) income taxes		0.6		0.1
Net income (loss)		$ 2.6		$ (0.2)
Net loss per common share:
Basic and dilutive (in dollars per share)		$ 0.02		$ 0.00
Shares used in per share calculations:
Basic and dilutive (in shares)		0.0		0.0
Product
Revenues:
Total net revenue	272.8	$ 181.3	513.9	$ 346.4
Cost of revenues:
Cost of goods and services sold	106.0	69.5	203.9	132.1
Product | As Reported
Revenues:
Total net revenue		177.5		349.4
Cost of revenues:
Cost of goods and services sold		69.6		133.1
Product | Accounting Standards Update 2014-09 | Adjustment
Revenues:
Total net revenue		3.8		(3.0)
Cost of revenues:
Cost of goods and services sold		(0.1)		(1.0)
Service
Revenues:
Total net revenue	34.1	24.1	61.5	49.9
Cost of revenues:
Cost of goods and services sold	$ 14.4	12.4	$ 25.2	23.9
Service | As Reported
Revenues:
Total net revenue		24.3		47.6
Cost of revenues:
Cost of goods and services sold		12.0		23.4
Service | Accounting Standards Update 2014-09 | Adjustment
Revenues:
Total net revenue		(0.2)		2.3
Cost of revenues:
Cost of goods and services sold		$ 0.4		$ 0.5