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Income Taxes - Rollforward of Unrecognized Tax Benefits (Details) - USD ($)
$ in Thousands
12 Months Ended
Aug. 31, 2021
Aug. 31, 2020
Aug. 31, 2019
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Balance at beginning of period $ 119,150 $ 101,128 $ 91,135
Additions attributable to current year tax positions 2,000 14,410 14,162
Additions attributable to prior year tax positions 15,974 6,128 0
Reductions attributable to prior year tax positions (14,975) (2,516) (4,169)
Balance at end of period $ 122,149 $ 119,150 $ 101,128