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SEGMENT INFORMATION, REVENUES BY GEOGRAPHY AND SIGNIFICANT CUSTOMERS - Revenues by product (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Total revenues	$ 307,276	$ 250,811	$ 590,181	$ 496,679
United States
Segment Reporting Information [Line Items]
Total revenues	$ 114,500	$ 89,800	$ 226,800	$ 181,700
Revenues
Segment Reporting Information [Line Items]
Revenue percentage	100.00%	100.00%	100.00%	100.00%
Service Provider Technology
Segment Reporting Information [Line Items]
Total revenues	$ 113,222	$ 119,852	$ 218,179	$ 239,767
Service Provider Technology | Revenues
Segment Reporting Information [Line Items]
Revenue percentage	37.00%	48.00%	37.00%	48.00%
Enterprise Technology
Segment Reporting Information [Line Items]
Total revenues	$ 194,054	$ 130,959	$ 372,002	$ 256,912
Enterprise Technology | Revenues
Segment Reporting Information [Line Items]
Revenue percentage	63.00%	52.00%	63.00%	52.00%

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