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Acquisitions Business combination, recognized intangible assets (Details)
$ in Millions
 9 Months Ended
Jun. 30, 2017
USD ($)
Acquired Indefinite-lived Intangible Assets [Line Items]  
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 35.00%
Petmatrix LLC [Member]  
Acquired Indefinite-lived Intangible Assets [Line Items]  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill $ 110.4
GloFish [Member]  
Acquired Indefinite-lived Intangible Assets [Line Items]  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill 37.8
Noncompete Agreements [Member] | Petmatrix LLC [Member]  
Acquired Indefinite-lived Intangible Assets [Line Items]  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill $ 2.4
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 5 years
Customer Relationships [Member] | Petmatrix LLC [Member]  
Acquired Indefinite-lived Intangible Assets [Line Items]  
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 12.00%
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill $ 12.0
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 16 years
Business Acquisition Contingent Consideration Key Assumptions Discount Rate 35.00%
Customer Relationships [Member] | GloFish [Member]  
Acquired Indefinite-lived Intangible Assets [Line Items]  
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 35.00%
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill $ 1.5
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 10 years
Business Acquisition Contingent Consideration Key Assumptions Discount Rate 12.00%
Technology-Based Intangible Assets [Member] | Petmatrix LLC [Member]  
Acquired Indefinite-lived Intangible Assets [Line Items]  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill $ 21.0
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 14 years
Technology-Based Intangible Assets [Member] | GloFish [Member]  
Acquired Indefinite-lived Intangible Assets [Line Items]  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill $ 30.2
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 13 years
Tradenames Trademarks And Patents [Member] | Petmatrix LLC [Member]  
Acquired Indefinite-lived Intangible Assets [Line Items]  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill $ 75.0
Tradenames Trademarks And Patents [Member] | GloFish [Member]  
Acquired Indefinite-lived Intangible Assets [Line Items]  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill $ 6.1
Minimum [Member] | Customer Relationships [Member] | Petmatrix LLC [Member]  
Acquired Indefinite-lived Intangible Assets [Line Items]  
Fair Value Inputs, Long-term Revenue Growth Rate 2.00%
Maximum [Member] | Customer Relationships [Member] | Petmatrix LLC [Member]  
Acquired Indefinite-lived Intangible Assets [Line Items]  
Fair Value Inputs, Long-term Revenue Growth Rate 20.00%
Retention Rate 98.00%