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Debt Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2017
Debt Instrument [Line Items] |  |  |
Short-term Debt | $ 0 | $ 0 |
Long-term Debt | 0 | 0 |
Interest Paid, Including Capitalized Interest, Operating and Investing Activities | 691 | $ 1,747 | $ 767
Revolving Credit Facility [Member] | Line of Credit [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt | 0 |  |
Revolving Credit Facility, Current Borrowing Capacity | 300,000 |  |
Revolving Credit Facility, Maximum Borrowing Capacity | $ 600,000 |  |
Revolving Credit Facility, Expiration Date | Feb. 20, 2020 |  |
Unsecured Debt [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Unsecured Loan, Issuance Date | May 01, 2019 |  |
Unsecured Loan, Unused Borrowing Capacity | $ 5,000 |  |
Unsecured Loan, Maturity Date | Apr. 30, 2021 |  |
Unsecured Loan, Amount Outstanding | $ 0 |  |
Federal Funds Effective Swap Rate [Member] | Revolving Credit Facility [Member] | Line of Credit [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Basis Spread on Variable Rate | 0.50% |  |
London Interbank Offered Rate (LIBOR) [Member] | Revolving Credit Facility [Member] | Line of Credit [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Basis Spread on Variable Rate | 1.00% |  |
Prime Rate [Member] | Unsecured Debt [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Basis Spread on Variable Rate | (1.00%) |  |

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