Debt Debt (Details) - USD ($)	9 Months Ended
	Mar. 31, 2019	Jun. 30, 2018
Long-term Debt Instruments [Line Items]
Line of Credit Facility, Amount Outstanding	$ 19,000,000	$ 19,500,000
Letters of Credit Outstanding, Amount	2,698,000
Debt Issuance Costs, Gross, Current	574,000	551,000
Debt Issuance Cost, Gross, Noncurrent	1,490,000	1,807,000
Revolving Credit Facility [Member]
Long-term Debt Instruments [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	250,000,000
Letters of Credit Outstanding, Amount	3,290,000	3,625,000
Line of Credit Facility, Remaining Borrowing Capacity	$ 227,710,000	$ 226,875,000
Debt, Weighted Average Interest Rate	4.39%	3.93%
Revolving Credit Facility [Member] | Minimum [Member]
Long-term Debt Instruments [Line Items]
Line of Credit Facility, Commitment Fee Percentage	0.10%
Revolving Credit Facility [Member] | Maximum [Member]
Long-term Debt Instruments [Line Items]
Line of Credit Facility, Commitment Fee Percentage	0.20%
Long-term Debt [Member]
Long-term Debt Instruments [Line Items]
Debt Instrument, Face Amount	$ 780,000,000
Long-term Debt	$ 618,500,000	$ 775,125,000
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate	4.25%	4.13%
Asset-backed Securities, Securitized Loans and Receivables [Member]
Long-term Debt Instruments [Line Items]
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate	3.39%
Principal Amount Outstanding on Loans Securitized or Asset-backed Financing Arrangement	$ 175,000,000
Debt Instrument, Fee	0.009
Prudential Facility [Domain]
Long-term Debt Instruments [Line Items]
Debt Instrument, Face Amount	170,000,000
Prudential Facility - Series C [Member]
Long-term Debt Instruments [Line Items]
Long-term Debt	$ 120,000,000
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate	3.19%
Prudential Facility - Series D [Member]
Long-term Debt Instruments [Line Items]
Long-term Debt	$ 50,000,000
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate	3.21%
State of Ohio Assumed Debt [Member]
Long-term Debt Instruments [Line Items]
Debt Instrument, Face Amount	$ 2,359,000
Long-term Debt	$ 1,263,000	$ 1,438,000
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate	1.50%