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Employee Benefit Plans (Employer Contributions) (Details) - USD ($)
$ in Thousands
12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]      
Matching contributions $ 1,163 $ 875 $ 735
Discretionary contributions 4,700 3,413 3,617
Total contributions $ 5,863 $ 4,288 $ 4,352