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SEGMENT INFORMATION, REVENUES BY GEOGRAPHY AND SIGNIFICANT CUSTOMERS - Revenues by product (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Segment Reporting Information [Line Items]
Total revenues	$ 228,616	$ 218,359	$ 213,536	$ 204,757	$ 185,676	$ 167,433	$ 161,871	$ 151,415	$ 865,268	$ 666,395	$ 595,947
Percentage of revenues									100.00%	100.00%	100.00%
Service Provider Technology
Segment Reporting Information [Line Items]
Total revenues									$ 455,598	$ 418,346	$ 418,021
Enterprise Technology
Segment Reporting Information [Line Items]
Total revenues									$ 409,670	$ 248,049	$ 177,926
Revenue
Segment Reporting Information [Line Items]
Percentage of revenues									100.00%	100.00%	100.00%
Revenue | Service Provider Technology
Segment Reporting Information [Line Items]
Percentage of revenues									53.00%	63.00%	70.00%
Revenue | Enterprise Technology
Segment Reporting Information [Line Items]
Percentage of revenues									47.00%	37.00%	30.00%

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
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