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Description of Business and Summary of Significant Accounting Policies (Reclassification from AOCI) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Aug. 31, 2019 | Aug. 31, 2018 | Aug. 31, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |
Operating income | $ (701,356) | $ (542,153) | $ (410,230)
Cost of revenue | 23,368,919 | 20,388,624 | 17,517,478
Interest expense | 188,730 | 149,002 | 138,074
Actuarial loss | 741 | 1,127 | 1,929
Prior service credit | (44) | (88) | (138)
Total amounts reclassified from AOCI | (450,704) | (373,401) | (256,233)
Income tax expense | (161,230) | (285,860) | (129,066)
Reclassification out of AOCI |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |
Total amounts reclassified from AOCI | 54,289 | (22,037) | 26,626
Reclassification out of AOCI | Foreign currency translation adjustment |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |
Operating income | 0 | 0 | 5,947
Reclassification out of AOCI | Realized losses (gains) on derivative instruments |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |
Loss to be reclassified in next 12 months | 17,000 |  |
Income tax expense |  | 14,800 |
Reclassification out of AOCI | Realized losses (gains) on derivative instruments | Foreign exchange contracts |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |
Cost of revenue | 21,982 | (9,379) | 4,799
Reclassification out of AOCI | Realized losses (gains) on derivative instruments | Interest rate contracts |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |
Interest expense | (1,723) | (13,697) | 3,950
Reclassification out of AOCI | Actuarial loss |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |
Actuarial loss | 741 | 1,127 | 1,929
Reclassification out of AOCI | Prior service credit |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |
Prior service credit | (44) | (88) | (138)
Reclassification out of AOCI | Available for sale securities |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |
Available for sale securities | $ 33,333 | $ 0 | $ 10,139

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