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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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- Definition The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented. If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD. + References No definition available. + Details
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