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RESTRUCTURING CHARGES (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		27 Months Ended
	Aug. 31, 2020	Aug. 31, 2019	Aug. 31, 2020	Aug. 31, 2019	Aug. 31, 2020
Restructuring Cost And Reserve [Line Items]
Restructuring charges	$ 551	$ 2,272	$ 2,459	$ 2,272	$ 14,900
Severance and employee related costs			2,300		9,100
Restructuring charges			200		5,800
Stock-based compensation			$ 900
Canton, Massachusetts [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring charges					$ 3,300
Sub lease commenced date					May 31, 2020