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Debt - Availability Under The Senior Credit Facility (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Jun. 30, 2017
Debt Disclosure [Abstract]    
Senior credit facility $ 300,000 $ 300,000
Capacity Constraint Due To Senior Leverage Ratio 178,899 169,092
Line Of Credit Facility Maximum Borrowing Capacity After Consideration Of Capacity Constraint 121,101 130,908
Line of Credit Facility, Amount Outstanding 9,304 44,682
Letters of credit subject to the credit facility 24,960 7,825
Availability under the senior credit facility $ 86,837 $ 78,401