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Acquisitions (Summary Of Purchase Price Allocated To Intangible Assets And Weighted Average Useful Lives) (Details) - USD ($) $ in Millions |  |  | 12 Months Ended
--- | --- | --- | ---
Jun. 01, 2017 | May 12, 2017 | Sep. 30, 2018
PetMatrix [Member] |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Carrying Amount | $ 110.4 |  |
GloFish [Member] |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Carrying Amount |  | $ 37.8 |
Tradenames [Member] |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Weighted Average Useful Life (Years) |  |  | 11 years 10 months 24 days
Tradenames [Member] | PetMatrix [Member] |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Carrying Amount | 75.0 |  |
Tradenames [Member] | GloFish [Member] |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Carrying Amount |  | 6.1 |
Technology Assets [Member] |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Weighted Average Useful Life (Years) |  |  | 12 years 1 month 6 days
Technology Assets [Member] | PetMatrix [Member] |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Carrying Amount | $ 21.0 |  |
Weighted Average Useful Life (Years) | 14 years |  |
Technology Assets [Member] | GloFish [Member] |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Carrying Amount |  | $ 30.2 |
Weighted Average Useful Life (Years) |  | 13 years |
Customer Relationships [Member] |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Weighted Average Useful Life (Years) |  |  | 18 years 6 months
Customer Relationships [Member] | PetMatrix [Member] |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Carrying Amount | $ 12.0 |  |
Weighted Average Useful Life (Years) | 16 years |  |
Customer Relationships [Member] | GloFish [Member] |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Carrying Amount |  | $ 1.5 |
Weighted Average Useful Life (Years) |  | 10 years |
Noncompete Agreements [Member] | PetMatrix [Member] |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Carrying Amount | $ 2.4 |  |
Weighted Average Useful Life (Years) | 5 years |  |

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- Definition Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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