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RESTRUCTURING ACTIVITIES (Narrative) (Details) - USD ($)	3 Months Ended			9 Months Ended		30 Months Ended
	Feb. 28, 2021	Nov. 30, 2020	Nov. 30, 2019	Nov. 30, 2020	Nov. 30, 2019	Nov. 30, 2020
Restructuring Cost And Reserve [Line Items]
Restructuring charges		$ 92,000	$ 848,000	$ 2,551,000	$ 3,120,000	$ 15,000,000.0
Severance and employee related costs				2,300,000		9,100,000
Restructuring charges				300,000		5,900,000
Stock-based compensation				$ 900,000
Maximum [Member] \| Forecast [Member]
Restructuring Cost And Reserve [Line Items]
Severance and employee related costs	$ 2,000,000.0
Canton, Massachusetts [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring charges						$ 3,300,000
Sub lease commenced date						May 31, 2020