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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 | $ 15.7 | $ 34.7 | $ 56.5
AAG Acquisition [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Total acquisition and integration related charges | 2.4 | 14.1 | 21.8
HHI Business |  |  |
Business Acquisition [Line Items] |  |  |
Total acquisition and integration related charges | 5.6 | 12.6 | 7.9
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 | 1.9 | 10.6
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 | $ 1.3 | $ 2.6 | $ 6.9

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