PROPERTY AND EQUIPMENT (Summary of Property and Equipment) (Details) - USD ($) $ in Thousands	12 Months Ended
	Aug. 31, 2018	Aug. 31, 2017	Aug. 31, 2016
Property, Plant and Equipment [Line Items]
Total property and equipment, historical cost	$ 864,173	$ 782,186
Less: accumulated depreciation	(269,770)	(224,357)
Property and equipment, net	594,403	557,829
Depreciation and amortization expense, Property and equipment	51,520	46,292	$ 39,794
Land [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment, historical cost	172,051	161,579
Building And Improvements [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment, historical cost	424,736	382,236
Fixtures And Equipment [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment, historical cost	228,891	198,147
Construction In Progress [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment, historical cost	$ 38,495	$ 40,224