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Asset Retirement Obligations (Schedule of Asset Retirement Obligations) (Details) (USD $)
In Thousands, unless otherwise specified |
6 Months Ended |
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Feb. 28, 2014
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| Asset Retirement Obligations [Abstract] | |
| Asset retirement obligations, August 31, 2013 | $ 2,777 |
| Liabilities incurred | 428 |
| Liabilities assumed | 572 |
| Liabilities settled | |
| Accretion | 156 |
| Asset retirement obligations, February 28, 2014 | $ 3,933 |