RESTRUCTURING CHARGES - Summary of Activity Resulting from Implementation of Restructuring Plan within Other Current and Non-current Liabilities (Details) - USD ($) $ in Thousands	6 Months Ended	15 Months Ended
	Aug. 31, 2019	May 31, 2019
Restructuring Cost And Reserve [Line Items]
Restructuring liabilities as of February 28, 2019	$ 5,756
Cease-use liability reclassified as reduction of Operating lease right-of-use assets	(2,977)
Charges	1,063	$ 5,300
Payments	(1,314)
Restructuring liabilities as of August 31, 2019	2,528
Personnel [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring liabilities as of February 28, 2019	2,779
Charges	1,063
Payments	(1,314)
Restructuring liabilities as of August 31, 2019	2,528
Facilities [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring liabilities as of February 28, 2019	2,977
Cease-use liability reclassified as reduction of Operating lease right-of-use assets	$ (2,977)