QUARTERLY FINANCIAL INFORMATION (Summary of Reclassifications on Cash Flow Statement) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended	9 Months Ended	12 Months Ended
	Nov. 30, 2017	Feb. 28, 2018	May 31, 2018	Aug. 31, 2018	Aug. 31, 2017	Aug. 31, 2016
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net cash provided by (used in) operating activites	$ (10,163)	$ 59,079	$ 90,765	$ 119,454	$ 123,021	$ 142,141
Investing Activities:
Business acquisition, net of cash acquired			(23,895)	(23,895)
Additions to property and equipment	(19,752)	(46,233)	(74,788)	(98,109)	(135,294)	(77,700)
Short-term investments	(39,339)	(66,388)	(72,953)	(77,997)
Proceeds from Settlements of short-term investments		7,643	19,063	45,693
Deposits for land purchase option agreements			300	(100)	(300)	(442)
Proceeds from disposal of property and equipment	20	54	93	629	377	86
Net cash provided by (used in) investing activities	(59,071)	(104,924)	(152,180)	(153,779)	(135,217)	(78,175)
Net cash provided by (used in) financing activities	(5,296)	(21,859)	(12,389)	(27,817)	(21,970)	(17,070)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	2,021	(1,142)	(985)	(6,656)	(2,838)	(2,777)
Net increase (decrease) in cash, cash equivalents, and restricted cash	(72,509)	(68,846)	(74,789)	(68,798)	(37,004)	44,119
Cash, cash equivalents, and restricted cash at beginning of period	165,712	165,712	165,712	165,712	202,716	158,597
Cash, cash equivalents, and restricted cash at end of period	93,203	96,866	90,923	96,914	165,712	$ 202,716
Previously Reported [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net cash provided by (used in) operating activites	(10,163)	59,079	90,765
Investing Activities:
Business acquisition, net of cash acquired			(23,895)
Additions to property and equipment	(19,752)	(46,233)	(74,788)
Deposits for land purchase option agreements			300
Proceeds from disposal of property and equipment	20	54	93
Net cash provided by (used in) investing activities	(19,732)	(46,179)	(98,290)
Net cash provided by (used in) financing activities	(5,296)	(21,859)	(12,389)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	2,021	(1,142)	(985)
Net increase (decrease) in cash, cash equivalents, and restricted cash	(33,170)	(10,101)	(20,899)
Cash, cash equivalents, and restricted cash at beginning of period	165,712	165,712	165,712	$ 165,712
Cash, cash equivalents, and restricted cash at end of period	132,542	155,611	144,813		$ 165,712
Reclassified [Member]
Investing Activities:
Short-term investments	(39,339)	(66,388)	(72,953)
Proceeds from Settlements of short-term investments		7,643	19,063
Net cash provided by (used in) investing activities	(39,339)	(58,745)	(53,890)
Net increase (decrease) in cash, cash equivalents, and restricted cash	(39,339)	(58,745)	(53,890)
Cash, cash equivalents, and restricted cash at end of period	$ (39,339)	$ (58,745)	$ (53,890)