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Acquisition (Narrative) (Details) - USD ($) |  |  |  | 3 Months Ended |
--- | --- | --- | --- | --- | ---
Aug. 05, 2016 | Aug. 04, 2016 | Jan. 25, 2016 | Dec. 31, 2016 | Mar. 31, 2016 | Sep. 30, 2016
Smart Card Software Limited |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Total consideration |  |  | $ 92,600,000 |  | $ 104,700,000 |
Escrow deposit for indemnification obligations and other contractual provisions |  |  | $ 17,100,000 |  |  |
Escrow deposit release term |  |  | 18 months |  |  |
Business acquisition transaction costs |  |  |  |  |  | $ 2,000,000
Smart Card Software Limited | Scenario, Previously Reported [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Total consideration |  |  |  |  | 12,100,000 |
Cash consideration |  |  |  |  | 11,600,000 |
Working capital consideration |  |  |  |  | 4,000,000 |
Liabilities assumed |  |  |  |  | $ 3,500,000 |
Smart Card Software Limited | Scenario, Forecast |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability |  |  |  | $ 10,800,000 |  |
Inphi Memory Interconnect Business [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Total consideration |  | $ 90,000,000 |  |  |  |
Escrow deposit for indemnification obligations and other contractual provisions |  | $ 11,300,000 |  |  |  |
Escrow deposit release term |  | 12 months |  |  |  |
Business acquisition transaction costs |  |  |  |  |  | 600,000
Snowbush [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Total consideration | $ 32,000,000 |  |  |  |  |
Business acquisition transaction costs |  |  |  |  |  | 600,000
Business Combination, Contingent Consideration, Liability |  |  |  |  |  | 6,800,000.0
Maximum [Member] | Snowbush [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business Combination, Contingent Consideration, Liability |  |  |  |  |  | $ 50,000,000.0

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