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Revenues (Details) - USD ($)
$ in Thousands
12 Months Ended
Aug. 31, 2021
Aug. 31, 2020
Aug. 31, 2019
Contract with Customer, Liability, Current $ 213,900 $ 139,100  
Revenue from Contract with Customer, Excluding Assessed Tax (38,448,033) (28,406,365) $ (31,900,453)
Contract with Customer, Liability, Revenue Recognized $ 139,100 $ 194,800 $ 170,700