Concentration of Risk and Segment Data (Segment Revenue) (Details 3) - USD ($) $ in Thousands	12 Months Ended
	Aug. 31, 2017	Aug. 31, 2016	Aug. 31, 2015
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenue	$ 19,063,121	$ 18,353,086	$ 17,899,196
EMS [Member] | Operating Segments [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenue	11,077,622	11,029,132	10,777,810
DMS [Member] | Operating Segments [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenue	$ 7,985,499	$ 7,323,954	$ 7,121,386