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Acquisitions - Summary of Acquisition and Integration Related Charges Incurred (Detail) - USD ($) | 12 Months Ended
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Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014
Business Acquisition [Line Items] |  |  |
Total acquisition and integration related charges | $ 37,300,000 | $ 61,100,000 | $ 24,400,000
AAG Acquisition [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Total acquisition and integration related charges | 14,600,000 | 21,800,000 | 0
HHI Business |  |  |
Business Acquisition [Line Items] |  |  |
Total acquisition and integration related charges | 13,300,000 | 12,000,000 | 11,100,000
Salix Animal Health LLC [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Total acquisition and integration related charges | 2,100,000 | 10,700,000 | 0
European IAMS and Eukanuba [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Total acquisition and integration related charges | 3,500,000 | 9,300,000 | 0
Other |  |  |
Business Acquisition [Line Items] |  |  |
Total acquisition and integration related charges | $ 3,800,000 | $ 7,300,000 | $ 13,300,000

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