Notes Payable and Long-Term Debt - Schedule of Interest, Net (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Feb. 28, 2014	Feb. 28, 2013	Feb. 28, 2014	Feb. 28, 2013
Debt Disclosure [Abstract]
Interest expense	$ 11,836	$ 23,219	$ 34,426	$ 47,655
Interest-purchase of NCRA noncontrolling interest	21,273	33,991	32,397	80,687
Interest Costs Capitalized	(2,526)	(2,694)	(3,862)	(5,596)
Interest income	(1,594)	(1,131)	(3,187)	(2,151)
Interest Income (Expense), Net	$ 28,989	$ 53,385	$ 59,774	$ 120,595