Annual report pursuant to Section 13 and 15(d)

Oil and Gas Activities (Unaudited) - Net Changes in Capitalized Costs That Are Not Being Depleted Pending Determination of Proved Reserves (Details)

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Oil and Gas Activities (Unaudited) - Net Changes in Capitalized Costs That Are Not Being Depleted Pending Determination of Proved Reserves (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Capitalized Costs of Unproved Properties Excluded from Amortization [Roll Forward]    
Fiscal year beginning balance $ 21,845 $ 6,234
Additions to capitalized costs 8,321 21,511
Assets sold or held for sale (680) (5,258)
Reclassified to producing properties (8,973)  
Charged to expense (20) (733)
Exchange adjustment (124) 91
Fiscal year closing balance 20,369 21,845
United States    
Capitalized Costs of Unproved Properties Excluded from Amortization [Roll Forward]    
Fiscal year beginning balance 19,955 496
Additions to capitalized costs 8,047 19,459
Assets sold or held for sale 0 0
Reclassified to producing properties (8,973)  
Charged to expense 0 0
Exchange adjustment 0 0
Fiscal year closing balance 19,029 19,955
Australia    
Capitalized Costs of Unproved Properties Excluded from Amortization [Roll Forward]    
Fiscal year beginning balance 0 3,976
Additions to capitalized costs 0 1,104
Assets sold or held for sale 0 (5,258)
Reclassified to producing properties 0  
Charged to expense 0 0
Exchange adjustment 0 178
Fiscal year closing balance 0 0
United Kingdom    
Capitalized Costs of Unproved Properties Excluded from Amortization [Roll Forward]    
Fiscal year beginning balance 1,890 1,762
Additions to capitalized costs 274 948
Assets sold or held for sale (680) 0
Reclassified to producing properties 0  
Charged to expense (20) (733)
Exchange adjustment (124) (87)
Fiscal year closing balance $ 1,340 $ 1,890