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Acquisitions Summary of Acquisition and Integration Related Charges (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Schedule of Acquisition and Integration Related Charges [Line Items] |  |  |  |
Business Combination Acquisition And Integration Related Costs | $ 5.8 | $ 8.0 | $ 15.0 | $ 31.2
Hhi Business [Member] |  |  |  |
Schedule of Acquisition and Integration Related Charges [Line Items] |  |  |  |
Business Combination Acquisition And Integration Related Costs | 1.8 | 4.4 | 5.7 | 12.0
Petmatrix LLC [Member] |  |  |  |
Schedule of Acquisition and Integration Related Charges [Line Items] |  |  |  |
Business Combination Acquisition And Integration Related Costs | 1.7 | 0.0 | 2.0 | 0.0
GloFish [Member] |  |  |  |
Schedule of Acquisition and Integration Related Charges [Line Items] |  |  |  |
Business Combination Acquisition And Integration Related Costs | 0.8 | 0.0 | 0.8 | 0.0
AAG Acquisition [Member] |  |  |  |
Schedule of Acquisition and Integration Related Charges [Line Items] |  |  |  |
Business Combination Acquisition And Integration Related Costs | 0.6 | 2.6 | 3.0 | 13.2
Shaser, Inc. [Member] |  |  |  |
Schedule of Acquisition and Integration Related Charges [Line Items] |  |  |  |
Business Combination Acquisition And Integration Related Costs | 0.2 | 0.0 | 1.4 | 0.0
Others [Member] |  |  |  |
Schedule of Acquisition and Integration Related Charges [Line Items] |  |  |  |
Business Combination Acquisition And Integration Related Costs | $ 0.7 | $ 1.0 | $ 2.1 | $ 6.0

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