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Acquisitions (Details) - USD ($) $ in Millions | Dec. 01, 2017 | Nov. 01, 2017 | Oct. 31, 2017 | Oct. 31, 2016 | Oct. 31, 2015
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Business Acquisition [Line Items] |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  |  | 100.00% | 100.00% | 100.00%
Subsequent Event [Member] | Teva Pharmaceuticals Industries LImited [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business Combination, Consideration Transferred |  | $ 1,100.0 |  |  |
Subsequent Event [Member] | Paragon Vision Sciences [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business Combination, Consideration Transferred | $ 80.0 |  |  |  |

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