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Acquisitions Summary of Acquisition and Integration Related Charges (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	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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