NATURE OF BUSINESS AND SIGNIFICANT ACCOUNTING POLICIES - Calculation of basic and diluted earnings per share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
Aug. 31, 2020	Aug. 31, 2019
Accounting Policies [Abstract]
Net loss	$ (77,656)	$ (39,636)
Less: Decrease in fair value of warrants	0	(8,986)
Net loss available to common shareholders	$ (77,656)	$ (48,622)
Weighted average common shares outstanding:
Basic (in shares)	114,085	84,880
Net effect of dilutive warrants	0	16
Diluted (in shares)	114,085	84,896
Net loss per common share per share:
Basic (in dollars per share)	$ (0.68)	$ (0.47)
Diluted (in dollars per share)	$ (0.68)	$ (0.57)

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