Derivatives and Hedging Activities - Narrative (Details) lb in Millions	3 Months Ended
	Sep. 30, 2017 USD ($) lb	Sep. 30, 2016 USD ($)	Jun. 30, 2017 USD ($)
Fair value of derivatives
Total asset derivatives on a gross basis	$ 19,500,000
Total liability derivatives on a gross basis	11,000,000
Cash collateral held by counterparties	0		$ 0
Net derivative losses included in AOCI expected to be reclassified into earnings	$ 2,700,000
Cash flow hedges | Commodity contracts
Fair value of derivatives
Amounts of raw materials to be purchased from forward contracts (in pounds) | lb	22.2
Cash flow hedges | Interest Rate Swaps
Fair value of derivatives
Net gains recorded as a reduction to interest expense	$ 100,000	$ 100,000
Fair value hedging | Interest Rate Swaps
Fair value of derivatives
Net gains recorded as a reduction to interest expense	200,000	$ 400,000
Total notional amounts of interest rate contracts	$ 150,000,000		$ 150,000,000