Acquisition - Summary of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	6 Months Ended
	Dec. 31, 2018	Jun. 30, 2018	Dec. 31, 2017	Dec. 31, 2016
Preliminary Valuation
Goodwill	$ 411,552		$ 401,758	$ 382,251
Altek
Preliminary Valuation
Cash and cash equivalents	1,700	$ 1,700
Net working capital	(1,300)	(1,500)
Property, plant and equipment	3,300	3,300
Intangible assets	52,700	52,500
Goodwill	22,500	20,900
Net deferred tax liabilities	(8,500)	(8,500)
Other liabilities	(300)	(300)
Total identifiable net assets of Altek	70,100	$ 68,100
Measurement Period Adjustments
Net working capital	200
Intangible assets	200
Goodwill	1,600
Total identifiable net assets of Altek	$ 2,000