Annual report pursuant to Section 13 and 15(d)

Hedging Transactions (Realized gain (loss)) (Details)

v3.2.0.727
Hedging Transactions (Realized gain (loss)) (Details) - USD ($)
$ in Thousands
12 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Derivative [Line Items]    
Realized loss on future commodity contracts, net $ (52,752) $ (23,091)
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 (1,980) (13,123)
Commodity Contract    
Derivative [Line Items]    
Realized loss on future commodity contracts, net $ (50,772) $ (9,968)