Operating Segments and Geographic Information (Details) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 26, 2015 USD ($)	Dec. 27, 2014 USD ($)	Dec. 26, 2015 USD ($) segment	Dec. 27, 2014 USD ($)
Segment Reporting [Abstract]
Number of reportable segments (in segment) | segment			2
Net revenue:
Net revenue	$ 218.3	$ 210.5	$ 430.9	$ 429.5
Gross profit	68.1	66.9	135.0	137.2
Operating Segments
Net revenue:
Net revenue	218.3	210.5	430.9	429.5
Gross profit	71.3	70.5	141.1	144.6
Unallocated Amounts
Net revenue:
Stock-based compensation	(1.5)	(1.2)	(2.7)	(2.6)
Amortization of intangibles	(1.7)	(1.9)	(3.4)	(3.8)
Other charges related to non-recurring activities	0.0	(0.5)	0.0	(1.0)
OpsComms | Operating Segments
Net revenue:
Net revenue	185.8	171.1	362.9	348.0
Gross profit	57.1	50.4	112.7	103.2
Lasers | Operating Segments
Net revenue:
Net revenue	32.5	39.4	68.0	81.5
Gross profit	$ 14.2	$ 20.1	$ 28.4	$ 41.4