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Business Acquisitions - Allocation of Consideration Transferred for Crescendo (Detail) - USD ($) $ in Millions | Jun. 30, 2015 | Jun. 30, 2014 | Feb. 28, 2014 | Jun. 30, 2013
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Business Acquisition [Line Items] |  |  |  |
Goodwill | $ 177.2 | $ 169.2 |  | $ 56.9
Crescendo Biosciences, Inc. |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Other assets acquired |  |  | $ 15.9 |
Intangible assets |  |  | 196.6 |
Goodwill |  |  | 112.3 |
Total assets acquired |  |  | 324.8 |
Deferred tax liabilities |  |  | 44.2 |
Other liabilities assumed |  |  | 21.6 |
Total net assets acquired |  |  | $ 259.0 |

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