RESTRUCTURING CHARGES (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended	24 Months Ended
May 31, 2020	May 31, 2019	May 31, 2020
Restructuring Cost And Reserve [Line Items]
Restructuring charges	$ 1,908	$ 0	$ 14,300
Severance and employee related costs	1,800		8,600
Restructuring charges	100		5,700
Stock-based compensation	$ 900
Canton, Massachusetts [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring charges			$ 3,300
Sub lease commenced date			May 31, 2020

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