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Income Taxes (Reconciliations of Unrecognized Tax Benefits) (Details 7) - USD ($) $ in Thousands | 12 Months Ended
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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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- Definition 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 + Details
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