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Income Taxes (Reconciliations of Unrecognized Tax Benefits) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Aug. 31, 2019 | Aug. 31, 2018 | Aug. 31, 2017
Reconciliation of Unrecognized Tax Benefits [Roll Forward] |  |  |
Beginning balance | $ 256,705 | $ 201,355 | $ 149,898
Additions for tax positions of prior years | 20,158 | 14,465 | 2,155
Reductions for tax positions of prior years | (106,252) | (21,045) | (12,233)
Additions for tax positions related to current year | 35,769 | 81,866 | 77,807
Cash settlements | 0 | (1,659) | (2,298)
Reductions from lapses in statutes of limitations | (2,570) | (7,496) | (10,446)
Reductions from settlements with taxing authorities | (35,582) | (5,928) | (6,061)
Foreign exchange rate adjustment | (3,845) | (4,853) | 2,533
Ending balance | 164,383 | 256,705 | 201,355
Unrecognized tax benefits that would affect the effective tax rate (if recognized) | $ 93,237 | $ 117,455 | $ 75,223

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