Accumulated Other Comprehensive Income (Summary of Changes in AOCI) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	May 31, 2016	May 31, 2015	May 31, 2016	May 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance			$ (50,854)
Other comprehensive (loss) income before reclassifications			(25,015)
Amounts reclassified from AOCI			29,762
Other comprehensive income (loss)	$ 22,904	$ (8,666)	4,747	$ (96,206)
Ending balance	(46,107)		(46,107)
Foreign currency translation adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance			6,666
Other comprehensive (loss) income before reclassifications			(5,433)
Other comprehensive income (loss)			(5,433)
Ending balance	1,233		1,233
Derivative instruments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance			(12,033)
Other comprehensive (loss) income before reclassifications			(15,834)
Amounts reclassified from AOCI			29,762
Other comprehensive income (loss)			13,928
Ending balance	1,895		1,895
Actuarial loss
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance			(30,624)
Ending balance	(30,624)		(30,624)
Prior service cost
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance			1,054
Ending balance	1,054		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			(3,748)
Other comprehensive income (loss)			(3,748)
Ending balance	$ (19,665)		$ (19,665)