Derivatives and Hedging Activities - Narrative (Details) lb in Millions	12 Months Ended
	Jun. 30, 2020 USD ($) lb	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)
Derivative Instruments, Gain (Loss) [Line Items]
Derivative contracts on a gross basis	$ 11,900,000
Derivative contracts liability on a gross basis	19,700,000
Cash collateral held by counterparties	0
Derivative losses included in AOCI	$ 5,600,000
Commodity contracts | Cash flow hedges
Derivative Instruments, Gain (Loss) [Line Items]
Amounts of raw materials to be purchased from forward contracts (in lbs) | lb	12.3
Forward interest rate swaps | Cash flow hedges | Interest expense
Derivative Instruments, Gain (Loss) [Line Items]
Net gains (loss) recorded recognized in interest expense	$ 300,000	$ 300,000	$ 300,000
Forward interest rate swaps | Fair Value Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Total notional amounts of interest rate contracts	150,000,000.0	150,000,000.0
Forward interest rate swaps | Fair Value Hedging | Interest expense
Derivative Instruments, Gain (Loss) [Line Items]
Net gains (loss) recorded recognized in interest expense	$ 1,400,000	$ (200,000)	$ 400,000