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Acquisitions - Summary of Acquisition and Integration Related Charges Incurred (Detail) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Business Acquisition [Line Items] |  |  |
Total acquisition and integration related charges | $ 21.0 | $ 37.3 | $ 61.1
AAG Acquisition [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Total acquisition and integration related charges | 3.2 | 14.6 | 21.8
Shaser, Inc. [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Total acquisition and integration related charges | 1.2 | 0.0 | 0.0
HHI Business |  |  |
Business Acquisition [Line Items] |  |  |
Total acquisition and integration related charges | 5.9 | 13.3 | 12.0
Petmatrix LLC [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Total acquisition and integration related charges | 4.5 | 0.0 | 0.0
GloFish [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Total acquisition and integration related charges | 1.0 | 0.0 | 0.0
Salix Animal Health LLC [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Total acquisition and integration related charges | 0.7 | 2.1 | 10.7
European IAMS and Eukanuba [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Total acquisition and integration related charges | 0.2 | 3.5 | 9.3
Other |  |  |
Business Acquisition [Line Items] |  |  |
Total acquisition and integration related charges | $ 4.3 | $ 3.8 | $ 7.3

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