Property, Plant and Equipment, Net (Narrative) (Details) $ in Thousands	3 Months Ended			12 Months Ended
	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Jun. 30, 2018 USD ($) facility	Jun. 30, 2017 USD ($) facility	Jun. 30, 2016 USD ($)
Property, Plant and Equipment [Line Items]
Depreciation				$ 33,973	$ 33,558	$ 32,641
Number of manufacturing facilities | facility				3	1
Impairment charge	$ 113		$ 3,449
United Kingdom
Property, Plant and Equipment [Line Items]
Impairment charge						$ 3,476
United States
Property, Plant and Equipment [Line Items]
Impairment charge					$ 2,661
Facility Closing | United Kingdom
Property, Plant and Equipment [Line Items]
Impairment charge		$ 2,557
Expected costs of closure of facility	4,800			$ 4,800
Manufacturing Facility | United Kingdom
Property, Plant and Equipment [Line Items]
Impairment charge				6,344	$ 23,712
Machinery and equipment | United States
Property, Plant and Equipment [Line Items]
Impairment charge		$ 2,057		2,057
Prepaid expenses and other current assets | Manufacturing Facility | United Kingdom
Property, Plant and Equipment [Line Items]
Assets held-for-sale	3,767			3,767
Prepaid expenses and other current assets | Machinery and equipment | United States
Property, Plant and Equipment [Line Items]
Assets held-for-sale	$ 686			$ 686