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Commitments and Contingencies - Purchase Commitments (Details) - USD ($) |  | 9 Months Ended |
--- | --- | --- | ---
Sep. 05, 2017 | Mar. 31, 2018 | Mar. 31, 2017 | Jun. 30, 2017
Purchase Commitment, Excluding Long-term Committment [Line Items] |  |  |  |
Payments to Acquire Intangible Assets |  | $ 14,034,000 | $ 0 |
Raw materials, wafers, and packaging and testing services puchase commitments |  |  |  |
Purchase Commitment, Excluding Long-term Committment [Line Items] |  |  |  |
Purchase commitment, amount |  | 38,400,000 |  | $ 25,700,000
Property and equipment purchase commitments |  |  |  |
Purchase Commitment, Excluding Long-term Committment [Line Items] |  |  |  |
Purchase commitment, amount |  | 89,600,000 |  | 69,200,000
License fees | STMicro |  |  |  |
Purchase Commitment, Excluding Long-term Committment [Line Items] |  |  |  |
Payments to Acquire Intangible Assets | $ 17,000,000 | 13,500,000 |  |
Intangible assets |  | 16,400,000 |  |
Indemnification Agreement |  |  |  |
Purchase Commitment, Excluding Long-term Committment [Line Items] |  |  |  |
Indemnifications accrual |  | $ 0 |  | $ 0

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