Segment Information (Long-lived Assets) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Jun. 30, 2017
Segment Reporting Information [Line Items]
Long-lived assets	$ 434,851	$ 423,074
United States [Member]
Segment Reporting Information [Line Items]
Long-lived assets	196,087	194,348
United Kingdom [Member]
Segment Reporting Information [Line Items]
Long-lived assets	169,054	165,396
All Other [Member]
Segment Reporting Information [Line Items]
Long-lived assets	$ 69,710	$ 63,330