Accumulated Other Comprehensive Income (Summary of Changes in AOCI) (Details) - USD ($) $ in Thousands	3 Months Ended
	Nov. 30, 2016	Nov. 30, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ (39,877)
Other comprehensive income (loss) before reclassifications	(16,635)
Amounts reclassified from AOCI	3,597
Other comprehensive loss	(13,038)	$ (8,678)
Ending balance	(52,915)
Foreign currency translation adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	16,338
Other comprehensive income (loss) before reclassifications	(23,619)
Other comprehensive loss	(23,619)
Ending balance	(7,281)
Derivative instruments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	7,784
Other comprehensive income (loss) before reclassifications	8,234
Amounts reclassified from AOCI	3,597
Other comprehensive loss	11,831
Ending balance	19,615
Actuarial loss
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(43,587)
Ending balance	(43,587)
Prior service cost
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	941
Ending balance	941
Unrealized (loss) gain on available for sale securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(21,353)
Other comprehensive income (loss) before reclassifications	(1,250)
Other comprehensive loss	(1,250)
Ending balance	$ (22,603)