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Risks and Concentrations of Credit Risk (Details)
$ in Thousands
12 Months Ended
Aug. 31, 2020
USD ($)
Aug. 31, 2019
USD ($)
Aug. 31, 2020
USD ($)
Aug. 31, 2020
PHP (₱)
Aug. 31, 2020
INR (₨)
Aug. 31, 2020
EUR (€)
Aug. 31, 2020
GBP (£)
Concentration Risk [Line Items]              
Fair market value of cash and cash equivalents and investments $ 605,200   $ 605,200        
Fair value of long-term debt 575,000   575,000        
Gross notional value       ₱ 1,300,000,000 ₨ 1,400,000,000 € 31,800,000 £ 36,400,000
Receivable reserve 8,000 $ 10,500 8,000        
Cash Flow Hedging | Designated as Hedging Instrument              
Concentration Risk [Line Items]              
Gross notional value 417,149 113,700 417,149        
Interest rate swap agreement | Cash Flow Hedging | Designated as Hedging Instrument              
Concentration Risk [Line Items]              
Gross notional value $ 287,500 $ 0 $ 287,500        
Annual subscriptions | Customer Concentration Risk | Largest client              
Concentration Risk [Line Items]              
Concentration risk (as a percent) 3.00% 3.00%          
Annual subscriptions | Customer Concentration Risk | Ten largest clients              
Concentration Risk [Line Items]              
Concentration risk (as a percent) 15.00% 15.00%          
Data costs | Supplier Concentration Risk | One vendor              
Concentration Risk [Line Items]              
Concentration risk (as a percent)     11.00%        
Revolving Credit Facility | The Loan              
Concentration Risk [Line Items]              
Hypothetical change (up or down) (basis points)     0.25%        
Change in annual interest expense     $ 700