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QUARTERLY FINANCIAL INFORMATION (Summary of Reclassifications on Financial Statement) (Details) - USD ($) $ in Thousands	Aug. 31, 2018	May 31, 2018	Feb. 28, 2018	Nov. 30, 2017	Aug. 31, 2017	Aug. 31, 2016	Aug. 31, 2015
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Cash and cash equivalents	$ 93,460	$ 87,274	$ 93,387	$ 89,844	$ 162,434	$ 199,522
Short-term and long-term restricted cash		3,649	3,479	3,359
Total cash, cash equivalents, and restricted cash shown in the Consolidated statements of cash flows	96,914	90,923	96,866	93,203	165,712	$ 202,716	$ 158,597
Short-term Investments	$ 32,304	53,890	58,745	39,339
Previously Reported [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Cash and cash equivalents		141,164	152,132	129,183
Short-term and long-term restricted cash		3,649	3,479	3,359
Total cash, cash equivalents, and restricted cash shown in the Consolidated statements of cash flows		144,813	155,611	132,542	$ 165,712
Reclassified [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Cash and cash equivalents		(53,890)	(58,745)	(39,339)
Total cash, cash equivalents, and restricted cash shown in the Consolidated statements of cash flows		(53,890)	(58,745)	(39,339)
Short-term Investments		$ 53,890	$ 58,745	$ 39,339