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Acquisitions - Allocation of Consideration Transferred (Detail) - USD ($) $ in Millions | Jul. 31, 2018 | Sep. 30, 2019 | Jun. 30, 2019 | Sep. 30, 2018
--- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |
Goodwill |  | $ 416.1 | $ 417.2 |
Counsyl Inc [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Current assets | $ 42.5 |  |  |
Intangible assets | 290.0 |  |  |
Equipment | 18.2 |  |  |
Other assets | 0.1 |  |  |
Goodwill | 99.3 | $ 99.3 |  | $ 94.9
Current liabilities | (19.6) |  |  |
Long term liabilities | (0.1) |  |  |
Deferred tax liability | (9.2) |  |  |
Total fair value purchase price | 421.2 |  |  |
Less: Cash acquired | (15.3) |  |  |
Total consideration transferred | $ 405.9 |  |  |

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