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Derivative Instruments - Schedule of Notional Volumes of Derivative Instruments (Details) - lb lb in Thousands | Dec. 31, 2018 | Jun. 30, 2018
--- | --- | ---
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount | (38,495) | (43,459)
Cash Flow Hedging | Designated as Hedging Instrument |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount | (31,350) | (40,913)
Cash Flow Hedging | Not Designated as Hedging Instrument | Long |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount | (7,145) | (2,546)

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- Definition Aggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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