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Acquisitions (Summary Of Acquisition And Integration Related Charges) (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
Business Acquisition [Line Items] |  |  |
Acquisition and integration related charges | $ 15.3 | $ 17.7 | $ 22.1
HHI Business [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Acquisition and integration related charges | 6.0 | 5.9 | 13.3
PetMatrix [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Acquisition and integration related charges | 4.9 | 4.5 |
GloFish [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Acquisition and integration related charges | 0.2 | 1.0 |
Shaser [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Acquisition and integration related charges | 0.1 | 1.2 |
Other [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Acquisition and integration related charges | $ 4.1 | $ 5.1 | $ 8.8

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- Definition Costs incurred to effect a business combination which have been expensed during the period. Such costs could include business integration costs, systems integration and conversion costs, and severance and other employee-related costs. + References No definition available. + Details
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