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, 2015	Feb. 28, 2014	Feb. 28, 2015	Feb. 28, 2014
Debt Disclosure [Abstract]
Interest Expense	$ 19,574us-gaap_InterestExpenseDebt	$ 11,836us-gaap_InterestExpenseDebt	$ 40,610us-gaap_InterestExpenseDebt	$ 34,426us-gaap_InterestExpenseDebt
Interest-purchase of NCRA noncontrolling interest	4,860	21,273	18,928	32,397
Capitalized interest	(12,706)	(2,526)	(24,611)	(3,862)
Interest income	(2,238)us-gaap_InterestIncomeOther	(1,594)us-gaap_InterestIncomeOther	(4,836)us-gaap_InterestIncomeOther	(3,187)us-gaap_InterestIncomeOther
Interest Income (Expense), Net	$ 9,490us-gaap_InterestIncomeExpenseNet	$ 28,989us-gaap_InterestIncomeExpenseNet	$ 30,091us-gaap_InterestIncomeExpenseNet	$ 59,774us-gaap_InterestIncomeExpenseNet

Interest Purchase of NCRA Noncontrolling Interest

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- Definition

Amount of interest costs capitalized disclosed as an adjusting item to interest costs incurred.

+ References

No definition available.

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- Definition

Amount of the cost of borrowed funds accounted for as interest expense for debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.8)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 8

-Article 5

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- Definition

The net amount of operating interest income (expense).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-04.10)

-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph 10

-Article 9

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Amount of interest income earned from interest bearing assets not separately disclosed.

+ References

No definition available.

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