Acquisitions - Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	9 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	Jun. 30, 2018
Business Acquisition [Line Items]
Goodwill	$ 412,449	$ 411,552
Altek
Business Acquisition [Line Items]
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