Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss, Net of Tax (Detail) $ in Thousands	6 Months Ended
	Feb. 28, 2018 USD ($)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ 1,018,130
Other comprehensive loss before reclassifications	2,823
Amounts reclassified from Accumulated other comprehensive loss	(665)
Ending balance	1,095,447
Unrealized (Gain) Loss on Derivative Financial Instruments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	181
Other comprehensive loss before reclassifications	1,829
Amounts reclassified from Accumulated other comprehensive loss	(665)
Ending balance	1,345
Foreign Currency Translation Adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(5,366)
Other comprehensive loss before reclassifications	969
Ending balance	(4,397)
Other
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(1,094)
Other comprehensive loss before reclassifications	25
Ending balance	(1,069)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(6,279)
Ending balance	$ (4,121)