Asset Retirement Obligations (Tables)
 6 Months Ended
Feb. 28, 2014
Asset Retirement Obligations [Abstract]  
Schedule of Fair Value Assumptions
 
     
For the Six Months Ended February 28,
     
2014
  
2013
Inflation rate
  
 3.9 - 4.0%
  
 3.9 - 4.0%
Estimated asset life
  
20.0 - 40.0 years
 
 24.0 - 27.6 years
Credit adjusted risk free interest rate
8.0%
  
11.2%

Schedule of Asset Retirement Obligations
 
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