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Derivative Instruments - Narrative (Details)
€ in Millions, £ in Millions, ₱ in Billions, ₨ in Billions
3 Months Ended 6 Months Ended
Nov. 30, 2020
Feb. 29, 2020
USD ($)
Feb. 28, 2019
USD ($)
Feb. 29, 2020
GBP (£)
Feb. 29, 2020
EUR (€)
Feb. 29, 2020
INR (₨)
Feb. 29, 2020
PHP (₱)
Aug. 31, 2019
USD ($)
Derivative Instruments and Hedging Activities Disclosures [Line Items]                
Discontinuance of cash flow hedges   $ 0 $ 0          
Estimated net derivative losses related to cash flow hedges included in AOCL to be reclassified into earnings within the next 12 months   (600,000)            
Philippine Peso | Forecast                
Derivative Instruments and Hedging Activities Disclosures [Line Items]                
Percent of foreign exchange contracts hedged (in percentage) 63.00%              
Foreign exchange contract | Cash flow hedging | Designated as hedging instrument                
Derivative Instruments and Hedging Activities Disclosures [Line Items]                
Gross notional amount   $ 80,277,000   £ 16.5 € 20.5 ₨ 1,434.3 ₱ 842.6 $ 113,700,000
British Pound Sterling | Forecast                
Derivative Instruments and Hedging Activities Disclosures [Line Items]                
Percent of foreign exchange contracts hedged (in percentage) 25.00%