Segment Information (Long-lived Assets) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Jun. 30, 2018
Segment Reporting Information [Line Items]
Long-lived assets	$ 366,120	$ 360,564
United States [Member]
Segment Reporting Information [Line Items]
Long-lived assets	102,664	99,650
United Kingdom [Member]
Segment Reporting Information [Line Items]
Long-lived assets	176,425	174,214
All Other [Member]
Segment Reporting Information [Line Items]
Long-lived assets	$ 87,031	$ 86,700