Annual report pursuant to Section 13 and 15(d)

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

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Oil and Gas Activities - 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, 2013
Jun. 30, 2012
Capitalized Costs of Unproved Properties Excluded from Amortization [Roll Forward]    
Fiscal year beginning balance $ 10,835 $ 8,085
Additions to capitalized costs 2,289 9,973
Assets sold or held for sale   (150)
Reclassified to producing properties (3,223) (3,772)
Charged to expense (3,092) (3,403)
Exchange adjustment (574) 102
Fiscal year closing balance 6,235 10,835
United States
    
Capitalized Costs of Unproved Properties Excluded from Amortization [Roll Forward]    
Fiscal year beginning balance 1,823 2,411
Additions to capitalized costs 1,954 4,631
Assets sold or held for sale   (150)
Reclassified to producing properties (3,223) (3,772)
Charged to expense (57) (1,297)
Exchange adjustment 0 0
Fiscal year closing balance 497 1,823
Australia
    
Capitalized Costs of Unproved Properties Excluded from Amortization [Roll Forward]    
Fiscal year beginning balance 4,388 415
Additions to capitalized costs 0 3,973
Assets sold or held for sale   0
Reclassified to producing properties 0 0
Charged to expense 0 0
Exchange adjustment (412) 0
Fiscal year closing balance 3,976 4,388
United Kingdom
    
Capitalized Costs of Unproved Properties Excluded from Amortization [Roll Forward]    
Fiscal year beginning balance 4,624 5,259
Additions to capitalized costs 335 1,369
Assets sold or held for sale   0
Reclassified to producing properties 0 0
Charged to expense (3,035) (2,106)
Exchange adjustment (162) 102
Fiscal year closing balance $ 1,762 $ 4,624