Derivative Instruments and Hedging Transactions (Realized Gain (Loss)) (Details) - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Mar. 31, 2018 |
Mar. 31, 2017 |
Mar. 31, 2018 |
Mar. 31, 2017 |
|
| Derivative [Line Items] | ||||
| Gains (losses) on derivative instruments: | $ 11,800 | $ 23,399 | $ 13,819 | $ 4,390 |
| Futures Commodity And Forwards Contracts And Open Purchase And Sale Commitments | ||||
| Derivative [Line Items] | ||||
| Unrealized gains (losses) on open future commodity and forward contracts and open sale and purchase commitments, net | 15,041 | 23,592 | 5,038 | (11,241) |
| Commodity Contract | ||||
| Derivative [Line Items] | ||||
| Realized (losses) gains on future commodity contracts, net | $ (3,241) | $ (193) | $ 8,781 | $ 15,631 |
| X | ||||||||||
- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
|
| X | ||||||||||
- Definition Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|