Derivatives and Hedging Activities - Narrative (Details) lb in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2020 USD ($) lb	Mar. 31, 2019 USD ($)	Mar. 31, 2020 USD ($) lb	Mar. 31, 2019 USD ($)	Jun. 30, 2019 USD ($)
Fair value of derivatives
Total asset derivatives	$ 8,300,000		$ 8,300,000
Total liability derivatives	23,800,000		23,800,000
Cash collateral held by counterparties	$ 0		0		$ 0
Net derivative gains included in AOCI expected to be reclassified into earnings			$ 8,800,000
Cash flow hedges | Commodity contracts
Fair value of derivatives
Amounts of raw materials to be purchased from forward contracts (in pounds) | lb	14.8		14.8
Fair value hedging | Interest Rate Swaps
Fair value of derivatives
Total notional amounts of interest rate contracts	$ 150,000,000.0		$ 150,000,000.0		$ 150,000,000
Interest expense | Cash flow hedges | Interest Rate Swaps
Fair value of derivatives
Interest rate swaps net gains (losses)	100,000	$ 100,000	300,000	$ 300,000
Interest expense | Fair value hedging | Interest Rate Swaps
Fair value of derivatives
Interest rate swaps net gains (losses)	$ 600,000	$ (200,000)	$ 700,000	$ (500,000)