Components of Accumulated Other Comprehensive Loss, Net of Tax (Detail) $ in Thousands	6 Months Ended
	Feb. 28, 2017 USD ($)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ 874,311
Other comprehensive loss before reclassifications	(5,748)
Amounts reclassified from Accumulated other comprehensive loss	3,151
Ending balance	942,084
Unrealized (Gain) Loss on Derivative Financial Instruments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(5,492)
Other comprehensive loss before reclassifications	(2,188)
Amounts reclassified from Accumulated other comprehensive loss	3,151
Ending balance	(4,529)
Foreign Currency Translation Adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(20,832)
Other comprehensive loss before reclassifications	(2,710)
Ending balance	(23,542)
Other
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(429)
Other comprehensive loss before reclassifications	(850)
Ending balance	(1,279)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(26,753)
Ending balance	$ (29,350)