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Operating Segments and Geographic Information (Tables)
 3 Months Ended
Sep. 30, 2017
Segment Reporting [Abstract]  
Schedule of information on reportable segments
Information on reportable segments is as follows (in millions):
 
Three Months Ended September 30, 2017
 
Network and Service Enablement
 
 
 
 
 
 
 
 
 
 
 
Network Enablement
 
Service Enablement
 
Network and Service Enablement
 
Optical Security and Performance Products
 
Total Segment Measures
 
Reconciling Items
 
Consolidated GAAP Measures
Net revenue
$
111.8

 
$
29.0

 
$
140.8

 
$
54.4

 
$
195.2

 
$
—

 
$
195.2

 
 
 
 
 
 
 
 
 
 
 
 
 
 
Gross profit
70.6

 
20.5

 
91.1

 
31.4

 
122.5

 
(6.3
)
 
116.2

Gross margin
63.1
%
 
70.7
%
 
64.7
%
 
57.7
%
 
62.8
%
 
 
 
59.5
%
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Operating income
 
 
 
 
7.2

 
22.2

 
29.4

 
(19.4
)
 
10.0

Operating margin
 
 
 
 
5.1
%
 
40.8
%
 
15.1
%
 
 
 
5.1
%
 
Three Months Ended October 1, 2016
 
Network and Service Enablement
 
 
 
 
 
 
 
 
 
 
 
Network Enablement
 
Service Enablement
 
Network and Service Enablement
 
Optical Security and Performance Products
 
Total Segment Measures
 
Reconciling Items
 
Consolidated GAAP Measures
Net revenue
$
118.6

 
$
36.4

 
$
155.0

 
$
55.8

 
$
210.8

 
$
—

 
$
210.8

 
 
 
 
 
 
 
 
 
 
 
 
 
 
Gross profit
77.4

 
21.3

 
98.7

 
31.6

 
130.3

 
(5.2
)
 
125.1

Gross margin
65.3
%
 
58.5
%
 
63.7
%
 
56.6
%
 
61.8
%
 
 
 
59.3
%
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Operating income (loss)
 
 
 
 
4.1

 
23.4

 
27.5

 
(17.4
)
 
10.1

Operating margin
 
 
 
 
2.6
%
 
41.9
%
 
13.0
%
 
 
 
4.8
%
 
Three Months Ended
 
September 30, 2017
 
October 1, 2016
Corporate reconciling items impacting gross profit:
 
 
 
Total segment gross profit
$
122.5

 
$
130.3

Stock-based compensation
(0.9
)
 
(1.0
)
Amortization of intangibles
(4.1
)
 
(3.8
)
Other charges unrelated to core operating performance (1)
(1.3
)
 
(0.4
)
GAAP gross profit
$
116.2

 
$
125.1

 
 
 
 
Corporate reconciling items impacting operating income:
 
 
 
Total segment operating income
$
29.4

 
$
27.5

Stock-based compensation
(7.5
)
 
(8.7
)
Amortization of intangibles
(7.2
)
 
(7.3
)
Other charges unrelated to core operating performance (1)
(3.2
)
 
(1.4
)
Restructuring and related charges
(1.5
)
 
—

GAAP operating income
$
10.0

 
$
10.1



(1) During the three months ended September 30, 2017 and October 1, 2016, other charges unrelated to core operating performance primarily consisted of loss on disposal of long-lived assets, and transformational initiatives such as the implementation of simplified automated processes, site consolidations, reorganizations, and the insourcing or outsourcing of activities. Additionally, during the three months ended September 30, 2017, the Company incurred acquisition related costs.