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Stock-Based Compensation and Shares Repurchases - Recognized Stock-Based Compensation Expense within Selling, General and Administrative Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
May 31, 2019
May 31, 2018
May 31, 2019
May 31, 2018
Share-based Payment Arrangement [Abstract]        
Restricted stock units and stock appreciation rights $ 12,592 $ 13,457 $ 41,247 $ 69,916
Employee stock purchase plan 1,914 1,581 6,205 5,368
Other 0 0 0 7,538
Total $ 14,506 $ 15,038 $ 47,452 $ 82,822