Concentration of Risk and Segment Data (Segment Revenue) (Details 2) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	May 31, 2017	May 31, 2016	May 31, 2017	May 31, 2016
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenue	$ 4,489,557	$ 4,310,752	$ 14,040,092	$ 13,922,323
EMS [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenue	2,819,711	2,846,919	8,205,812	8,228,595
DMS [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenue	$ 1,669,846	$ 1,463,833	$ 5,834,280	$ 5,693,728