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Debt Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
Debt Narrative (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Debt Instrument [Line Items]
Capital leases - short term	$ 0
Interest Paid	1,747	$ 767	$ 1,320
Revolving Credit Facility [Member] \| Line of Credit [Member]
Debt Instrument [Line Items]
Long-term Debt	0	$ 50,000
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	Apr. 24, 2017
Unsecured Loan, Unused Borrowing Capacity	$ 5,000
Unsecured Loan, Maturity Date	Apr. 30, 2019
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%)