The Company and Significant Accounting Policies - Government Grants Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Government grants, reduction recorded to interest expense	$ 6.1	$ 0.3
Government grants, reduction recorded to operating expenses	4.7
Government grants, reduction recorded to property, plant and equipment	$ 1.3		$ 3.3