PROPERTY AND EQUIPMENT - Components of Property and Equipment, Net (Detail) - USD ($) $ in Thousands	12 Months Ended
	Aug. 31, 2017	Aug. 31, 2016	Aug. 31, 2015
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 3,052,744	$ 2,686,567
Total accumulated depreciation	(1,912,146)	(1,730,025)
Property and equipment, net	1,140,598	956,542	$ 801,884
Depreciation	362,817	327,736	$ 311,305
Buildings and land
Property, Plant and Equipment [Line Items]
Property and equipment, gross	3,162	2,914
Computers, related equipment and software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	1,611,641	1,428,134
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment, gross	393,351	354,523
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 1,044,590	$ 900,996