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INFORMATION RELATING TO THE CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Details) - USD ($)
$ in Thousands
6 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Supplemental disclosure of cash flow information:    
Income taxes refunded, net $ (2,249) $ (20)
Canadian income tax withholding on proceeds from the sale of oil and natural gas properties 0 789
Oil and natural gas    
Supplemental disclosures of cash flow information:    
Increase (decrease) in capital expenditure accruals related to oil and natural gas exploration and development (105) (88)
Increase (decrease) in capital expenditure accruals related to oil and natural gas asset retirement obligations $ 267 $ (38)