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Exploration Activities (Tables)
12 Months Ended
Sep. 30, 2016
Exploration Activities [Abstract]  
Summary of costs incurred in the oil property acquisition, exploration and development activities
   September 30, 
2016
  September 30, 
2015
 
 Acquisition of Properties:      
 Proved $  $ 
 Unproved  194,037   135,835 
 Exploration costs  39,658   46,351 
 Development costs