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Acquisitions Additional information (Details) - USD ($) $ in Millions	9 Months Ended
	Jun. 30, 2017	Sep. 30, 2016
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	35.00%
Document Period End Date	Jun. 30, 2017
Goodwill	$ 2,621.3	$ 2,478.4
GloFish [Member]
Goodwill	15.4
Petmatrix LLC [Member]
Goodwill	$ 123.8
Customer Relationships [Member] | GloFish [Member]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	35.00%
Customer Relationships [Member] | Petmatrix LLC [Member]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	12.00%
Customer Relationships [Member] | Petmatrix LLC [Member] | Minimum [Member]
Fair Value Inputs, Long-term Revenue Growth Rate	2.00%
Customer Relationships [Member] | Petmatrix LLC [Member] | Maximum [Member]
Fair Value Inputs, Long-term Revenue Growth Rate	20.00%

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