Segment Information (Long-lived Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Jun. 30, 2018
Segment Reporting Information [Line Items]
Long-lived assets	$ 369,744	$ 360,564
United States [Member]
Segment Reporting Information [Line Items]
Long-lived assets	108,930	99,650
United Kingdom [Member]
Segment Reporting Information [Line Items]
Long-lived assets	174,625	174,214
All Other [Member]
Segment Reporting Information [Line Items]
Long-lived assets	$ 86,189	$ 86,700