Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies (Derivative Instruments) (Details)

v2.4.0.8
Summary of Significant Accounting Policies (Derivative Instruments) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2012
Derivative [Line Items]      
Realized loss on future commodity contracts, net $ (23,091) $ (66,608) $ (39,738)
Futures Commodity And Forwards Contracts And Open Purchase And Sale Commitments [Member]
     
Derivative [Line Items]      
Unrealized gain (loss) on open future commodity and forward contracts and open sale and purchase commitments, net (13,123) (28,199) 35,762
Commodity Contract
     
Derivative [Line Items]      
Realized loss on future commodity contracts, net $ (9,968) $ (38,409) $ (75,500)