Derivative Instruments - Schedule of Notional Volumes of Derivative Instruments (Details) - lb lb in Thousands	3 Months Ended
	Dec. 31, 2017	Jun. 30, 2017
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	(33,375)	(35,159)
Derivative contract term	19 months
Cash Flow Hedging | Designated as Hedging Instrument
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	(31,763)	(33,038)
Cash Flow Hedging | Not Designated as Hedging Instrument | Long
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	(1,612)	(2,121)