Concentration of Risk and Segment Data (Segment Revenue) (Details) - USD ($) $ in Thousands	12 Months Ended
	Aug. 31, 2020	Aug. 31, 2019	Aug. 31, 2018
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenue	$ 27,266,438	$ 25,282,320	$ 22,095,416
EMS
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenue	16,612,022	15,430,529	12,268,600
DMS
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenue	$ 10,654,416	$ 9,851,791	$ 9,826,816