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Equities Changes in Equity (Details) (USD $) | 3 Months Ended |  | 3 Months Ended |  | 3 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Nov. 30, 2013 | Nov. 30, 2012 | Aug. 31, 2011 | Nov. 30, 2013 Capital equity certificates [Member] | Nov. 30, 2012 Capital equity certificates [Member] | Nov. 30, 2013 Noncontrolling Interest [Member] | Nov. 30, 2012 Noncontrolling Interest [Member] | Aug. 31, 2011 Noncontrolling Interest [Member] | Nov. 30, 2013 Class B Preferred Stock [Member] | Sep. 03, 2013 Class B Preferred Stock [Member]
Schedule of Capitalization, Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Outstanding |  |  |  |  |  |  |  |  |  | 11,319,175
Preferred Stock, Redemption Amount |  |  |  |  |  |  |  |  |  | $ 283,000,000
Proceeds from Issuance of Preferred Stock, net of Issuance Costs | 273,724,000 |  |  |  |  |  |  |  | (273,700,000) |
Preferred Stock Dividends Accrued | (10,160,000) | 6,136,000 |  |  |  |  |  |  |  |
Equities Deconsolidated | (8,016,000) |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |
Stockholders' Equity Attributable to Parent | 5,131,208,000 |  | 4,455,341,000 |  |  |  |  |  |  |
Net Income (Loss) Attributable to Parent | 242,186,000 | 343,707,000 |  |  |  |  |  |  |  |
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent | (434,000) | 245,000 |  |  |  |  |  |  |  |
Retirements Of Equities | (2,520,000) | (2,378,000) |  |  |  |  |  |  |  |
Dividends and equity retirement determination |  |  |  | 2,520,000 | 2,378,000 |  |  |  |  |
Equity Certificates Issued During Period, Value, New Issues |  |  |  | 45,000 | 14,240,000 |  |  |  |  |
Change in Accrued Dividends and Equities Payable | 87,000,000 | (147,091,000) |  |  |  |  |  |  |  |
Stockholders' Equity, Other | 642,000 | 3,431,000 |  |  |  | 637,000 | 1,146,000 |  |  |
Stockholders' Equity Attributable to Parent | 5,542,195,000 | 4,663,737,000 | 4,455,341,000 |  |  |  |  |  |  |
Stockholders' Equity Attributable to Noncontrolling Interest | 21,539,000 |  |  |  |  |  |  | 17,982,000 |  |
Net income attributable to noncontrolling interests | 842,000 | 2,174,000 |  |  |  |  |  |  |  |
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders |  |  |  |  |  |  |  |  |  |
Stockholders' Equity Attributable to Noncontrolling Interest | $ 18,239,000 | $ 21,302,000 |  |  |  |  |  | $ 17,982,000 |  |
Preferred Stock, Dividend Rate, Percentage |  |  |  |  |  |  |  |  | 7.875% |

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