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Acquisitions - Summary of Acquisition and Integration Related Charges Incurred (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2018 | Mar. 31, 2017
Business Acquisition [Line Items] |  |  |  |
Total acquisition and integration related charges | $ 4.5 | $ 3.3 | $ 9.7 | $ 6.6
AAG Acquisition [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Total acquisition and integration related charges | 0.4 | 0.6 | 0.6 | 1.9
HHI Business |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Total acquisition and integration related charges | 1.9 | 1.9 | 4.6 | 3.8
Petmatrix LLC [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Total acquisition and integration related charges | 2.1 | 0.0 | 3.7 | 0.0
Other |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Total acquisition and integration related charges | $ 0.1 | $ 0.8 | $ 0.8 | $ 0.9

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