Accumulated Other Comprehensive Income (Summary of Changes in AOCI) (Details) - USD ($) $ in Thousands	3 Months Ended
	Nov. 30, 2015	Nov. 30, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ (50,854)
Other comprehensive (loss) income before reclassifications	(19,742)
Amounts reclassified from AOCI	11,064
Other comprehensive (loss) income	(8,678)	$ (37,252)
Ending balance	(59,532)
Foreign currency translation adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	6,666
Other comprehensive (loss) income before reclassifications	(20,542)
Other comprehensive (loss) income	(20,542)
Ending balance	(13,876)
Derivative instruments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(12,033)
Other comprehensive (loss) income before reclassifications	(909)
Amounts reclassified from AOCI	11,064
Other comprehensive (loss) income	10,155
Ending balance	(1,878)
Actuarial loss
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(30,624)
Ending balance	(30,624)
Prior service cost
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	1,054
Ending balance	1,054
Unrealized (loss) gain on available for sale securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(15,917)
Other comprehensive (loss) income before reclassifications	1,709
Other comprehensive (loss) income	1,709
Ending balance	$ (14,208)