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The Company and Significant Accounting Policies - Government Grants Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
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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

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