STOCK BASED COMPENSATION (Summary of Components of Stock-Based Compensation Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Aug. 31, 2020	Aug. 31, 2019	Aug. 31, 2018
STOCK BASED COMPENSATION [Abstract]
Restricted stock awards	$ 8,747	$ 11,477	$ 7,476
Restricted stock units	3,011	2,820	2,742
Performance-based restricted stock units	2,059	764
Stock-based compensation expense	$ 13,817	$ 15,061	$ 10,218