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Equity Based Employee Benefit Plans Performance Shares (Details) (USD $)
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1 Months Ended | 12 Months Ended | |||
|---|---|---|---|---|---|
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Aug. 31, 2015
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Jul. 31, 2010
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Mar. 31, 2010
|
Jan. 28, 2012
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Jan. 29, 2011
|
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||||
| Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | 600,000 | 500,000 | 8,377,845 | ||
| Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | August 2015 | 3 | 3 | ||
| Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ 19.27 | $ 15.93 | |||
| Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights Percentage | 58.20% | 93.00% | |||