Accumulated Other Comprehensive Income (Summary of Changes in AOCI) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	May 31, 2017	May 31, 2016	May 31, 2017	May 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance			$ (39,877)
Other comprehensive income (loss) before reclassifications			28,351
Amounts reclassified from AOCI			27,453
Total other comprehensive income	$ 24,606	$ 22,904	55,804	$ 4,747
Ending balance	15,927		15,927
Foreign currency translation adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance			16,338
Other comprehensive income (loss) before reclassifications			9,512
Amounts reclassified from AOCI			5,719
Total other comprehensive income			15,231
Ending balance	31,569		31,569
Derivative instruments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance			7,784
Other comprehensive income (loss) before reclassifications			8,647
Amounts reclassified from AOCI			11,595
Total other comprehensive income			20,242
Ending balance	28,026		28,026
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
Available for sale securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance			(21,353)
Other comprehensive income (loss) before reclassifications			10,192
Amounts reclassified from AOCI			10,139
Total other comprehensive income			20,331
Ending balance	$ (1,022)		$ (1,022)