Derivative Instruments - Schedule of Notional Volumes of Derivative Instruments (Details) - lb lb in Thousands	3 Months Ended
	Sep. 30, 2018	Jun. 30, 2018
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	(51,326)	(43,459)
Cash Flow Hedging
Derivative [Line Items]
Derivative contract term	18 months
Cash Flow Hedging | Designated as Hedging Instrument
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	(48,900)	(40,913)
Cash Flow Hedging | Not Designated as Hedging Instrument | Long
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	(2,463)	(2,546)
Cash Flow Hedging | Not Designated as Hedging Instrument | Short [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	(37)	0