Accumulated Other Comprehensive Income (Summary of Changes in AOCI) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Feb. 28, 2017	Feb. 29, 2016	Feb. 28, 2017	Feb. 29, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance			$ (39,877)
Other comprehensive income (loss) before reclassifications			13,935
Amounts reclassified from AOCI			17,263
Total other comprehensive income (loss)	$ 44,236	$ (9,479)	31,198	$ (18,157)
Ending balance	(8,679)		(8,679)
Foreign currency translation adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance			16,338
Other comprehensive income (loss) before reclassifications			(2,365)
Amounts reclassified from AOCI			5,869
Total other comprehensive income (loss)			3,504
Ending balance	19,842		19,842
Derivative instruments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance			7,784
Other comprehensive income (loss) before reclassifications			10,656
Amounts reclassified from AOCI			11,394
Total other comprehensive income (loss)			22,050
Ending balance	29,834		29,834
Actuarial loss
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance			(43,587)
Ending balance	(43,587)		(43,587)
Prior service cost
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance			941
Ending balance	941		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			5,644
Total other comprehensive income (loss)			5,644
Ending balance	$ (15,709)		$ (15,709)