SEGMENT INFORMATION, REVENUES BY GEOGRAPHY AND SIGNIFICANT CUSTOMERS - Revenues by product (Details) - USD ($) $ in Thousands |
3 Months Ended | 12 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Jun. 30, 2019 |
Mar. 31, 2019 |
Dec. 31, 2018 |
Sep. 30, 2018 |
Jun. 30, 2018 |
Mar. 31, 2018 |
Dec. 31, 2017 |
Sep. 30, 2017 |
Jun. 30, 2019 |
Jun. 30, 2018 |
Jun. 30, 2017 |
|
| Segment Reporting Information [Line Items] | |||||||||||
| Total revenues | $ 286,641 | $ 284,911 | $ 307,276 | $ 282,905 | $ 269,778 | $ 250,404 | $ 250,811 | $ 245,868 | $ 1,161,733 | $ 1,016,861 | $ 865,268 |
| Percentage of revenues | 100.00% | 100.00% | 100.00% | ||||||||
| Revenue | |||||||||||
| Segment Reporting Information [Line Items] | |||||||||||
| Percentage of revenues | 100.00% | 100.00% | 100.00% | ||||||||
| Service Provider Technology | |||||||||||
| Segment Reporting Information [Line Items] | |||||||||||
| Total revenues | $ 428,490 | $ 446,600 | $ 455,598 | ||||||||
| Service Provider Technology | Revenue | |||||||||||
| Segment Reporting Information [Line Items] | |||||||||||
| Percentage of revenues | 37.00% | 44.00% | 53.00% | ||||||||
| Enterprise Technology | |||||||||||
| Segment Reporting Information [Line Items] | |||||||||||
| Total revenues | $ 733,243 | $ 570,261 | $ 409,670 | ||||||||
| Enterprise Technology | Revenue | |||||||||||
| Segment Reporting Information [Line Items] | |||||||||||
| Percentage of revenues | 63.00% | 56.00% | 47.00% | ||||||||