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Basis of Presentation - Fair Value (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Jun. 30, 2017
Fair Value of Financial Instruments
Liabilities - contingent payment obligations	$ 16,667	$ 11,840
Recurring
Fair Value of Financial Instruments
Equity securities	17	254
Insurance company contracts	31,384	26,940
Interest rate swap agreement	22	20
Total assets	31,423	27,214
Liabilities - contingent payment obligations	16,667	11,840
Recurring | Level 1
Fair Value of Financial Instruments
Equity securities	17	254
Total assets	17	254
Recurring | Level 2
Fair Value of Financial Instruments
Insurance company contracts	31,384	26,940
Interest rate swap agreement	22	20
Total assets	31,406	26,960
Recurring | Level 3
Fair Value of Financial Instruments
Total assets	0
Liabilities - contingent payment obligations	$ 16,667	$ 11,840

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