|
Asset Retirement Obligations (Schedule of Fair Value Assumptions) (Details)
|
6 Months Ended | |
|---|---|---|
|
Feb. 28, 2014
|
Feb. 28, 2013
|
|
| Credit adjusted risk free interest rate | 8.00% | 11.20% |
|
Minimum [Member]
|
||
| Inflation rate | 3.90% | 3.90% |
| Estimated asset life | 20 years | 24 years |
|
Maximum [Member]
|
||
| Inflation rate | 4.00% | 4.00% |
| Estimated asset life | 40 years | 27 years 7 months 6 days |