Notes Payable and Long-Term Debt - Schedule of Interest, Net (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Nov. 30, 2012	Nov. 30, 2011
Debt Disclosure [Abstract]
Interest expense	$ 24,436	$ 23,307
Interest-purchase of NCRA noncontrolling interest	46,696
Interest Costs Capitalized	(2,902)	(1,806)
Interest income	(1,020)	(694)
Interest Income (Expense), Net	$ 67,210	$ 20,807