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, unless otherwise specified
 12 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Capitalized Costs of Unproved Properties Excluded from Amortization [Roll Forward]    
Fiscal year beginning balance $ 6,235 $ 10,835
Additions to capitalized costs (1) 21,511 [1] 2,289
Assets sold or held for sale (5,258)  
Reclassified to producing properties   (3,223)
Charged to expense (733) (3,092)
Exchange adjustment 91 (574)
Fiscal year closing balance 21,846 6,235
United States
    
Capitalized Costs of Unproved Properties Excluded from Amortization [Roll Forward]    
Fiscal year beginning balance 497 1,823
Additions to capitalized costs (1) 19,459 [1] 1,954
Assets sold or held for sale 0  
Reclassified to producing properties   (3,223)
Charged to expense 0 (57)
Exchange adjustment 0 0
Fiscal year closing balance 19,956 497
Australia
    
Capitalized Costs of Unproved Properties Excluded from Amortization [Roll Forward]    
Fiscal year beginning balance 3,976 4,388
Additions to capitalized costs (1) 1,104 [1] 0
Assets sold or held for sale (5,258)  
Reclassified to producing properties   0
Charged to expense 0 0
Exchange adjustment 178 (412)
Fiscal year closing balance 0 3,976
United Kingdom
    
Capitalized Costs of Unproved Properties Excluded from Amortization [Roll Forward]    
Fiscal year beginning balance 1,762 4,624
Additions to capitalized costs (1) 948 [1] 335
Assets sold or held for sale 0  
Reclassified to producing properties   0
Charged to expense (733) (3,035)
Exchange adjustment (87) (162)
Fiscal year closing balance $ 1,890 $ 1,762
[1] The Company began implementing a CO2-enhanced oil recovery pilot project at NP in the first quarter of fiscal year 2014.