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Financial Instruments (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Jun. 30, 2019
--- | --- | ---
Fair Value [Line Items] |  |
Debt Instrument, Fair Value Disclosure | $ 630,200 | $ 622,000
Contracts Translated to U S Dollars [Member] |  |
Fair Value [Line Items] |  |
Derivative, Notional Amount | 2,200 | 61,500
Estimated Amount Of Receivable On Settlement Of Interest Rate Swap Contracts |  | 200
Foreign Exchange Contract [Member] |  |
Fair Value [Line Items] |  |
Derivative, Notional Amount | 2,200 | $ 61,500
Forward Starting Interest Rate Swap Contracts [Member] |  |
Fair Value [Line Items] |  |
Derivative, Notional Amount | 200,000 |
Designated as Hedging Instrument [Member] | Other Liabilities [Member] | Forward Starting Interest Rate Swap Contracts [Member] |  |
Fair Value [Line Items] |  |
Derivative Asset, Fair Value, Gross Asset | $ (2,094) |

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