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Derivatives and Hedging Activities - Narrative (Details) lb in Millions | 12 Months Ended
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Jun. 30, 2019 USD ($) lb | Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($)
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivative contracts on a gross basis | $ 14,900,000 |  |
Derivative contracts liability on a gross basis | 30,400,000 |  |
Cash collateral held by counterparties | 0 |  |
Derivative losses included in AOCI | $ 8,400,000 |  |
Commodity contracts | Cash flow hedges |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amounts of raw materials to be purchased from forward contracts (in lb) | lb | 19.0 |  |
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 | 150,000,000 |
Forward interest rate swaps | Fair Value Hedging | Interest expense |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Net gains (loss) recorded recognized in interest expense | $ (200,000) | $ 400,000 | $ 1,800,000

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