Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss, Net of Tax (Detail) $ in Thousands	6 Months Ended
	Feb. 28, 2019 USD ($)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ 1,250,101
Ending balance	1,257,818
Unrealized Gain (Loss) on Derivative Financial Instruments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(431)
Other comprehensive loss before reclassifications	(3,337)
Amounts reclassified from Accumulated other comprehensive loss	1,170
Ending balance	(2,598)
Foreign Currency Translation Adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(21,506)
Other comprehensive loss before reclassifications	(2,165)
Amounts reclassified from Accumulated other comprehensive loss	0
Ending balance	(23,671)
Other
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(1,429)
Other comprehensive loss before reclassifications	76
Amounts reclassified from Accumulated other comprehensive loss	0
Ending balance	(1,353)
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(23,366)
Other comprehensive loss before reclassifications	(5,426)
Amounts reclassified from Accumulated other comprehensive loss	1,170
Ending balance	$ (27,622)