Concentration of Risk and Segment Data (Segment Revenue) (Details 2) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Feb. 28, 2017	Feb. 29, 2016	Feb. 28, 2017	Feb. 29, 2016
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenue	$ 4,445,637	$ 4,403,594	$ 9,550,535	$ 9,611,571
EMS [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenue	2,682,811	2,657,262	5,386,100	5,381,676
DMS [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenue	$ 1,762,826	$ 1,746,332	$ 4,164,435	$ 4,229,895