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Fair Value Measurements (Fair Value Measurements on a Recurring Basis) (Details) - Fair Value, Recurring - USD ($)
$ in Thousands
May 31, 2020
Aug. 31, 2019
Level 1 | Cash equivalents    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash equivalents $ 38,259 $ 27,804
Level 1 | Prepaid expenses and other current assets:    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term investments 16,860 14,088
Level 2 | Prepaid expenses and other current assets: | Designated as Hedging Instruments | Foreign exchange contracts    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Forward foreign exchange contracts 6,277 904
Level 2 | Prepaid expenses and other current assets: | Not Designated as Hedging Instruments | Foreign exchange contracts    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Forward foreign exchange contracts 7,210 6,878
Level 2 | Accrued expenses: | Designated as Hedging Instruments | Foreign exchange contracts    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Liabilities 4,403 15,999
Level 2 | Accrued expenses: | Designated as Hedging Instruments | Interest rate swaps    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Liabilities 3,357 5,918
Level 2 | Accrued expenses: | Designated as Hedging Instruments | Forward interest rate swaps    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Liabilities 50,923  
Level 2 | Accrued expenses: | Not Designated as Hedging Instruments | Foreign exchange contracts    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Liabilities 38,004 55,391
Level 2 | Other liabilities: | Designated as Hedging Instruments | Forward interest rate swaps    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Liabilities   35,045
Level 3 | Other assets:    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior Non-Convertible Preferred Stock $ 14,400 $ 33,102