Annual report pursuant to Section 13 and 15(d)

Supplemental Oil and Gas Information (Unaudited) - Changes in Standardized Measure of Discounted Future Net Cash Flows (Details)

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Supplemental Oil and Gas Information (Unaudited) - Changes in Standardized Measure of Discounted Future Net Cash Flows (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flow Relating to Proved Oil and Gas Reserves [Roll Forward]    
Fiscal year beginning balance $ 87,043 $ 107,676
Net change in prices and production costs (71,406) (10,222)
Revisions of previous quantity estimates (54,415) (34,441)
Divestiture of reserves 0 (10,285)
Changes in estimated future development costs 9,071 3,161
Sales and transfers of oil and gas produced (440) (4,720)
Previously estimated development cost incurred during the period 7,749 1,723
Accretion of discount 8,853 14,632
Net change in income taxes 32,188 16,746
Net change in timing and other (1,626) 2,773
Fiscal year ending balance 17,017 87,043
United States    
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flow Relating to Proved Oil and Gas Reserves [Roll Forward]    
Fiscal year beginning balance 87,043 97,391
Net change in prices and production costs (71,406) (10,222)
Revisions of previous quantity estimates (54,415) (34,441)
Divestiture of reserves 0 0
Changes in estimated future development costs 9,071 3,161
Sales and transfers of oil and gas produced (440) (4,720)
Previously estimated development cost incurred during the period 7,749 1,723
Accretion of discount 8,853 14,632
Net change in income taxes 32,188 16,746
Net change in timing and other (1,626) 2,773
Fiscal year ending balance 17,017 87,043
Australia    
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flow Relating to Proved Oil and Gas Reserves [Roll Forward]    
Fiscal year beginning balance 0 10,285
Net change in prices and production costs 0 0
Revisions of previous quantity estimates 0 0
Divestiture of reserves 0 (10,285)
Changes in estimated future development costs 0 0
Sales and transfers of oil and gas produced 0 0
Previously estimated development cost incurred during the period 0 0
Accretion of discount 0 0
Net change in income taxes 0 0
Net change in timing and other 0 0
Fiscal year ending balance $ 0 $ 0