Summary of Significant Accounting Policies - Components of Accumulated Other Comprehensive Loss, Net of Tax (Detail) $ in Thousands	12 Months Ended
	Aug. 31, 2021 USD ($)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ 1,293,043
Ending balance	1,307,748
Unrealized Gain (Loss) on Derivative Financial Instruments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(11,970)
Other comprehensive income (loss) before reclassifications	(394)
Amounts reclassified from accumulated other comprehensive loss	4,979
Ending balance	(7,385)
Foreign Currency Translation Adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(39,816)
Other comprehensive income (loss) before reclassifications	3,995
Ending balance	(35,821)
Other
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(1,031)
Other comprehensive income (loss) before reclassifications	524
Ending balance	(507)
Accumulated Other Comprehensive (Loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(52,817)
Other comprehensive income (loss) before reclassifications	4,125
Amounts reclassified from accumulated other comprehensive loss	4,979
Ending balance	$ (43,713)