Concentration of Risk and Segment Data (Segment Assets) (Details 5) - USD ($) $ in Thousands	Aug. 31, 2016	Aug. 31, 2015
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	$ 10,322,677	$ 9,591,600
EMS [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	2,615,237	2,865,172
DMS [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	5,012,798	4,241,699
Other non-allocated assets
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	$ 2,694,642	$ 2,484,729