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Acquisitions - Allocation of Consideration Transferred (Detail) - USD ($) $ in Millions | Jul. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018
--- | --- | --- | ---
Business Acquisition [Line Items] |  |  |
Goodwill |  | $ 413.3 | $ 318.6
Counsyl Inc [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Current assets | $ 42.5 |  |
Intangible assets | 292.9 |  |
Equipment | 18.9 |  |
Other assets | 0.1 |  |
Goodwill | 94.9 |  |
Current liabilities | (19.6) |  |
Long term liabilities | (0.1) |  |
Deferred tax liability | (7.3) |  |
Total fair value purchase price | 422.3 |  |
Less: Cash acquired | (15.3) |  |
Total consideration transferred | $ 407.0 |  |

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