Recently Issued Accounting Pronouncements - Expected Impact on Income Statement (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended								12 Months Ended
	Jun. 29, 2019	Mar. 30, 2019	Dec. 29, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 30, 2017	Sep. 30, 2017	Jun. 29, 2019	Jun. 30, 2018	Jul. 01, 2017
Revenues:
Total net revenue	$ 289.7	$ 265.2	$ 306.9	$ 268.5	$ 260.7	$ 218.7	$ 205.4	$ 190.9	$ 1,130.3	$ 875.7	$ 805.0
Cost of revenues:
Amortization of acquired technologies									34.4	26.7	14.3
Total cost of revenues									478.9	387.3	326.0
Gross profit	169.5	153.5	178.0	150.4	133.0	123.3	119.4	112.7	651.4	488.4	479.0
Operating income									67.4	1.9	7.0
Loss before taxes									39.3	(35.7)	180.0
Total income tax expense									31.5	12.9	21.4
Net income (loss)	$ 12.5	$ (4.8)	$ 13.0	$ (15.3)	$ (29.2)	$ (10.7)	$ (1.1)	$ (7.6)	$ 5.4	$ (48.6)	$ 160.2
Net loss per common share:
Basic (in dollars per share)	$ 0.05	$ (0.02)	$ 0.06	$ (0.07)	$ (0.13)	$ (0.05)	$ 0	$ (0.03)	$ 0.02	$ (0.21)	$ 0.70
Diluted (in dollars per share)	$ 0.05	$ (0.02)	$ 0.06	$ (0.07)	$ (0.13)	$ (0.05)	$ 0	$ (0.03)	$ 0.02	$ (0.21)	$ 0.68
Shares used in per share calculations:
Basic (in shares)	228.7	228.3	228.3	227.2	226.5	226.3	227.4	228.1	228.1	227.1	229.9
Diluted (in shares)	232.5	228.3	230.4	227.2	226.5	226.3	227.4	228.1	231.2	227.1	234.5
As Reported
Revenues:
Total net revenue										$ 880.4	$ 811.4
Cost of revenues:
Amortization of acquired technologies										26.7	14.3
Total cost of revenues										388.2	325.4
Gross profit										492.2	486.0
Operating income										5.1	13.6
Loss before taxes										(32.6)	186.6
Total income tax expense										13.4	21.3
Net income (loss)										$ (46.0)	$ 166.9
Net loss per common share:
Basic (in dollars per share)										$ (0.20)	$ 0.73
Diluted (in dollars per share)										$ (0.20)	$ 0.71
Shares used in per share calculations:
Basic (in shares)										227.1
Diluted (in shares)										227.1
Accounting Standards Update 2014-09 | Adjustment
Revenues:
Total net revenue										$ (4.7)	$ (6.4)
Cost of revenues:
Amortization of acquired technologies										0.0	0.0
Total cost of revenues										(0.9)	0.6
Gross profit										(3.8)	(7.0)
Operating income										(3.2)	(6.6)
Loss before taxes										(3.1)	(6.6)
Total income tax expense										(0.5)	0.1
Net income (loss)										$ (2.6)	$ (6.7)
Net loss per common share:
Basic (in dollars per share)										$ (0.01)	$ (0.03)
Diluted (in dollars per share)										$ (0.01)	$ (0.03)
Product
Revenues:
Total net revenue									$ 1,004.2	$ 772.5	$ 706.0
Cost of revenues:
Cost of revenue									394.8	310.6	259.6
Product | As Reported
Revenues:
Total net revenue										783.1	726.4
Cost of revenues:
Cost of revenue										314.7	260.9
Product | Accounting Standards Update 2014-09 | Adjustment
Revenues:
Total net revenue										(10.6)	(20.4)
Cost of revenues:
Cost of revenue										(4.1)	(1.3)
Service
Revenues:
Total net revenue									126.1	103.2	99.0
Cost of revenues:
Cost of revenue									$ 49.7	50.0	52.1
Service | As Reported
Revenues:
Total net revenue										97.3	85.0
Cost of revenues:
Cost of revenue										46.8	50.2
Service | Accounting Standards Update 2014-09 | Adjustment
Revenues:
Total net revenue										5.9	14.0
Cost of revenues:
Cost of revenue										$ 3.2	$ 1.9