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Income Taxes (Reconciliations of Unrecognized Tax Benefits) (Details 7) - USD ($) $ in Thousands	12 Months Ended
	Aug. 31, 2017	Aug. 31, 2016	Aug. 31, 2015
Income Taxes [Abstract]
Beginning balance	$ 149,898	$ 154,648	$ 229,684
Additions for tax positions of prior years	2,155	7,974	4,189
Reductions for tax positions of prior years	(12,233)	(20,045)	(7,919)
Additions for tax positions related to current year	77,807	25,892	21,541
Adjustments for tax positions related to acquired entities			1,687
Cash settlements	(2,298)	(6,553)	(11,806)
Reductions from lapses in statutes of limitations	(10,446)	(7,099)	(1,843)
Reductions from settlements with taxing authorities	(6,061)	(1,787)	(72,812)
Foreign exchange rate adjustment	2,533	(3,132)	(8,073)
Ending balance	201,355	149,898	154,648
Unrecognized tax benefits that would affect the effective tax rate (if recognized)	$ 75,223	$ 72,152	$ 80,094

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Amount of increase (decrease) in unrecognized tax benefits resulting from acquisitions.

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Amount of increase (decrease) in unrecognized tax benefits resulting from foreign exchange rate adjustments.

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The gross amount of decreases in unrecognized tax benefits resulting from cash settlements.

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Amount of unrecognized tax benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15A
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=65882285&loc=SL6600010-109319

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Unrecognized Tax Benefit
-URI http://asc.fasb.org/extlink&oid=6527854

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