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Derivative Instruments and Hedging Activities - Narrative (Details) $ in Thousands, $ in Millions	6 Months Ended
	Feb. 29, 2020 USD ($)	Feb. 29, 2020 CAD ($)	Aug. 31, 2019 USD ($)
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Amount reclassified from accumulated other comprehensive loss	$ (33,101)		$ (33,688)
Forward Contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional value (CAD)		$ 7.1
Amount reclassified from accumulated other comprehensive loss	200
Reclassification of nominal value	100
Other Long-Term Assets \| Forward Contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Fair value of the contracts	100
Prepaid Expenses and Other Current Assets \| Forward Contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Fair value of the contracts	$ 200