Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss, Net of Tax (Detail) $ in Thousands	3 Months Ended
	Nov. 30, 2018 USD ($)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ 1,250,101
Other comprehensive loss before reclassifications	(6,448)
Amounts reclassified from Accumulated other comprehensive loss	469
Ending balance	1,257,631
Unrealized (Gain) Loss on Derivative Financial Instruments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(431)
Other comprehensive loss before reclassifications	(2,302)
Amounts reclassified from Accumulated other comprehensive loss	469
Ending balance	(2,264)
Foreign Currency Translation Adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(21,506)
Other comprehensive loss before reclassifications	(3,916)
Ending balance	(25,422)
Other
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(1,429)
Other comprehensive loss before reclassifications	(230)
Ending balance	(1,659)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(23,366)
Ending balance	$ (29,345)