Concentration of Risk and Segment Data (Segment Assets) (Details 4) - USD ($) $ in Thousands	May. 31, 2015	Aug. 31, 2014
Segment Reporting Asset Reconciling Item [Line Items]
Assets	$ 8,965,533	$ 8,479,746
EMS
Segment Reporting Asset Reconciling Item [Line Items]
Assets	2,632,642	2,300,262
DMS
Segment Reporting Asset Reconciling Item [Line Items]
Assets	3,682,890	3,460,769
Other non-allocated assets
Segment Reporting Asset Reconciling Item [Line Items]
Assets	$ 2,650,001	2,699,046
Discontinued Operations
Segment Reporting Asset Reconciling Item [Line Items]
Assets		$ 19,669