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Acquisitions PetMatrix Acquisition (details) (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Business Combination Segment Allocation [Line Items] |  |  |
Goodwill (Note 12) | $ 2,277.1 | $ 2,133.3 | $ 2,138.9
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 35.00% |  |
Petmatrix LLC [Member] |  |  |
Business Combination Segment Allocation [Line Items] |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents | $ 0.2 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables | 7.8 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory | 16.0 |  |
Property, plant and equipment | 0.9 |  |
Goodwill (Note 12) | 0.8 |  |
Goodwill (Note 12) | 123.8 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets | 110.4 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable | (4.7) |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net | 255.2 |  |
Business Combination, Consideration Transferred | 255.2 |  |
Noncompete Agreements [Member] | Petmatrix LLC [Member] |  |  |
Business Combination Segment Allocation [Line Items] |  |  |
Goodwill (Note 12) | $ 2.4 |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 5 years |  |
Technology-Based Intangible Assets [Member] | Petmatrix LLC [Member] |  |  |
Business Combination Segment Allocation [Line Items] |  |  |
Goodwill (Note 12) | $ 21.0 |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 14 years |  |
Customer Relationships [Member] | Petmatrix LLC [Member] |  |  |
Business Combination Segment Allocation [Line Items] |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 35.00% |  |
Business Acquisition Contingent Consideration Key Assumptions Discount Rate | 12.00% |  |
Goodwill (Note 12) | $ 12.0 |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 16 years |  |
Tradenames Trademarks And Patents [Member] | Petmatrix LLC [Member] |  |  |
Business Combination Segment Allocation [Line Items] |  |  |
Goodwill (Note 12) | $ 75.0 |  |

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