Income Taxes (Reconciliations of Unrecognized Tax Benefits) (Details 7) - USD ($) $ in Thousands	12 Months Ended
	Aug. 31, 2016	Aug. 31, 2015	Aug. 31, 2014
Income Taxes [Abstract]
Beginning balance	$ 154,648	$ 229,684	$ 219,132
Additions for tax positions of prior years	7,974	4,189	16,533
Reductions for tax positions of prior years	(20,045)	(7,919)	(3,843)
Additions for tax positions related to current year	25,892	21,541	18,219
Adjustments for tax positions related to disposed entities			(1,917)
Adjustments for tax positions related to acquired entities		1,687	(3,195)
Cash settlements	(6,553)	(11,806)	(9,406)
Reductions from lapses in statutes of limitations	(7,099)	(1,843)	(1,909)
Reductions from settlements with taxing authorities	(1,787)	(72,812)	(4,344)
Foreign exchange rate adjustment	(3,132)	(8,073)	414
Ending balance	149,898	154,648	229,684
Unrecognized tax benefits that would affect the effective tax rate (if recognized)	$ 72,152	$ 80,094	$ 72,586