Components of Accumulated Other Comprehensive Loss, Net of Tax (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Nov. 30, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ (6,504)
Other comprehensive income (loss) before reclassifications	3,232
Amounts reclassified from accumulated other comprehensive income (loss)	137
Ending balance	(3,135)
Unrealized Income (Loss) on Derivative Financial Instruments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(1,053)
Other comprehensive income (loss) before reclassifications	762
Amounts reclassified from accumulated other comprehensive income (loss)	137
Ending balance	(154)
Foreign Currency Translation Adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(4,923)
Other comprehensive income (loss) before reclassifications	2,471
Ending balance	(2,452)
Other
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(528)
Other comprehensive income (loss) before reclassifications	(1)
Ending balance	$ (529)