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Acquisitions - Summary of Acquisition and Integration Related Charges Incurred (Detail) - USD ($) $ in Millions | 3 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Business Acquisition [Line Items] |  |
Total acquisition and integration related charges | $ 5.2 | $ 3.3
AAG Acquisition [Member] |  |
Business Acquisition [Line Items] |  |
Total acquisition and integration related charges | 0.2 | 1.3
HHI Business |  |
Business Acquisition [Line Items] |  |
Total acquisition and integration related charges | 2.7 | 1.9
Petmatrix LLC [Member] |  |
Business Acquisition [Line Items] |  |
Total acquisition and integration related charges | 1.6 | 0.0
GloFish [Member] |  |
Business Acquisition [Line Items] |  |
Total acquisition and integration related charges | 0.4 | 0.0
Other |  |
Business Acquisition [Line Items] |  |
Total acquisition and integration related charges | $ 0.3 | $ 0.1

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