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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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