Operating Segments and Geographic Information - Segment Reconciling Items (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2016	Jan. 02, 2016	Dec. 31, 2016	Jan. 02, 2016
Information on reportable segments
Amortization of acquired technologies	$ (3.7)	$ (4.6)	$ (7.5)	$ (8.9)
Gross profit	124.7	141.8	249.8	282.3
Operating income	6.7	9.2	16.8	6.3
Stock-based compensation	(9.1)	(8.9)	(17.8)	(24.9)
Amortization of intangibles	(3.4)	(3.7)	(6.9)	(7.5)
Restructuring and related charges	(1.8)	(1.4)	(1.8)	(1.8)
Segment Measures
Information on reportable segments
Gross profit	129.9	147.9	260.2	294.0
Operating income	26.9	30.5	54.4	59.2
Reconciling Items
Information on reportable segments
Stock-based compensation	(1.0)	(1.4)	(2.0)	(2.6)
Amortization of acquired technologies	(3.7)	(4.6)	(7.5)	(8.9)
Other charges related to non-recurring activities	(0.5)	(0.1)	(0.9)	(0.2)
Gross profit	(5.2)	(6.1)	(10.4)	(11.7)
Operating income	(20.2)	(21.3)	(37.6)	(52.9)
Stock-based compensation	(9.1)	(8.9)	(17.8)	(24.9)
Amortization of intangibles	(7.1)	(8.3)	(14.4)	(16.4)
Other charges related to non-recurring activities	(2.2)	(2.7)	(3.6)	(9.8)
Restructuring and related charges	$ (1.8)	$ (1.4)	$ (1.8)	$ (1.8)