COMMITMENTS AND CONTINGENCIES - Other Leases - Additional Information (Details) $ in Thousands		9 Months Ended
	Aug. 01, 2019 USD ($) ft²	Mar. 31, 2019 USD ($) ft²
Malyern, Pennsylvania (Office Space)
Area of leased office (sq ft) | ft²		23,138
Monthly base rent		$ 48
San Francisco, California
Area of leased office (sq ft) | ft²		8,400
Monthly base rent		$ 45
Maximum | San Francisco, California
Monthly base rent		$ 47
Subsequent Event | Denver, Colorado
Area of leased office (sq ft) | ft²	16,713
Monthly base rent	$ 45
Subsequent Event | Maximum | Denver, Colorado
Monthly base rent	$ 53