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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, 2020 | Aug. 31, 2019 | Aug. 31, 2018
Realized losses (gains) on derivative instruments: |  |  |
Foreign exchange contracts | $ 25,335,625 | $ 23,368,919 | $ 20,388,624
Interest rate contracts | 173,877 | 188,730 | 149,002
Actuarial (gain) loss | (4,159) | 741 | 1,127
Prior service credit | (45) | (44) | (88)
Loss on securities | 48,625 | 29,632 | 0
Total amounts reclassified from AOCI | (260,738) | (450,704) | (373,401)
Reduction in income tax expense | (203,959) | (161,230) | (285,860)
Reclassification out of AOCI |  |  |
Realized losses (gains) on derivative instruments: |  |  |
Total amounts reclassified from AOCI | 46,622 | 54,289 | (22,037)
Reclassification out of AOCI | Realized losses (gains) on derivative instruments |  |  |
Realized losses (gains) on derivative instruments: |  |  |
Loss to be reclassified in next 12 months | 4,700 |  |
Reduction in income tax expense |  |  | 14,800
Reclassification out of AOCI | Realized losses (gains) on derivative instruments | Foreign exchange contracts |  |  |
Realized losses (gains) on derivative instruments: |  |  |
Foreign exchange contracts | 15,507 | 21,982 | (9,379)
Reclassification out of AOCI | Realized losses (gains) on derivative instruments | Interest rate contracts |  |  |
Realized losses (gains) on derivative instruments: |  |  |
Interest rate contracts | (1,101) | (1,723) | (13,697)
Reclassification out of AOCI | Actuarial (gain) loss |  |  |
Realized losses (gains) on derivative instruments: |  |  |
Actuarial (gain) loss | (4,159) | 741 | 1,127
Reclassification out of AOCI | Prior service credit |  |  |
Realized losses (gains) on derivative instruments: |  |  |
Prior service credit | (45) | (44) | (88)
Reclassification out of AOCI | Available for sale securities |  |  |
Realized losses (gains) on derivative instruments: |  |  |
Loss on securities | $ 36,420 | $ 33,333 | $ 0

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