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Derivative Instruments - Narrative (Details)
12 Months Ended
Aug. 31, 2020
USD ($)
Aug. 31, 2020
PHP (₱)
Aug. 31, 2020
INR (₨)
Aug. 31, 2020
EUR (€)
Aug. 31, 2020
GBP (£)
Aug. 31, 2020
USD ($)
Aug. 31, 2019
USD ($)
Derivative [Line Items]              
Gross notional value   ₱ 1,300,000,000 ₨ 1,400,000,000 € 31,800,000 £ 36,400,000    
Minimum              
Derivative [Line Items]              
Currency exposure (as a percent) 25.00%            
Maximum              
Derivative [Line Items]              
Currency exposure (as a percent) 75.00%            
2019 Revolving Credit Facility | PNC Bank, National Associations              
Derivative [Line Items]              
Borrowing from revolving credit facility           $ 575,000,000.0  
Maximum borrowing capacity           $ 750,000,000.0  
2019 Revolving Credit Facility | PNC Bank, National Associations | LIBOR              
Derivative [Line Items]              
Basis spread on variable rate 0.875%            
Fixed rate   0.7995% 0.7995% 0.7995% 0.7995% 0.7995%  
Cash Flow Hedging | Designated as Hedging Instrument              
Derivative [Line Items]              
Gross notional value           $ 417,149,000 $ 113,700,000
Foreign currency forward contracts | Cash Flow Hedging | Designated as Hedging Instrument              
Derivative [Line Items]              
Gross notional value           129,649,000 113,700,000
Estimated pre-tax derivative gains to be reclassified in next 12 months $ 1,700,000            
Interest rate swap agreement | Cash Flow Hedging | Designated as Hedging Instrument              
Derivative [Line Items]              
Gross notional value           $ 287,500,000 $ 0