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Goodwill And Intangible Assets (Changes In The Carrying Amount Of Goodwill By Reporting Segment) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2018 | Sep. 30, 2017
Goodwill [Line Items] |  |
As of September 30 | $ 1,461.8 | $ 1,317.3
Foreign currency impact |  | 9.5
Foreign currency impact | (7.1) |
As of September 30 | 1,454.7 | 1,461.8
Hardware & Home Improvement [Member] |  |
Goodwill [Line Items] |  |
As of September 30 | 708.7 | 702.8
Foreign currency impact |  | 5.9
Foreign currency impact | (4.4) |
As of September 30 | 704.3 | 708.7
Global Pet Supplies [Member] |  |
Goodwill [Line Items] |  |
As of September 30 | 437.1 | 299.8
Foreign currency impact |  | 2.3
Foreign currency impact | (1.2) |
As of September 30 | 435.9 | 437.1
Home and Garden [Member] |  |
Goodwill [Line Items] |  |
As of September 30 | 196.5 | 196.5
Foreign currency impact |  |
Foreign currency impact |  |
As of September 30 | 196.5 | 196.5
Home And Personal Care [Member] |  |
Goodwill [Line Items] |  |
As of September 30 | 119.5 | 118.2
Foreign currency impact |  | 1.3
Foreign currency impact | (1.5) |
As of September 30 | $ 118.0 | 119.5
PetMatrix [Member] |  |
Goodwill [Line Items] |  |
Acquisition |  | 123.8
PetMatrix [Member] | Hardware & Home Improvement [Member] |  |
Goodwill [Line Items] |  |
Acquisition |  |
PetMatrix [Member] | Global Pet Supplies [Member] |  |
Goodwill [Line Items] |  |
Acquisition |  | 123.8
PetMatrix [Member] | Home and Garden [Member] |  |
Goodwill [Line Items] |  |
Acquisition |  |
PetMatrix [Member] | Home And Personal Care [Member] |  |
Goodwill [Line Items] |  |
Acquisition |  |
GloFish [Member] |  |
Goodwill [Line Items] |  |
Acquisition |  | 11.2
GloFish [Member] | Hardware & Home Improvement [Member] |  |
Goodwill [Line Items] |  |
Acquisition |  |
GloFish [Member] | Global Pet Supplies [Member] |  |
Goodwill [Line Items] |  |
Acquisition |  | 11.2
GloFish [Member] | Home and Garden [Member] |  |
Goodwill [Line Items] |  |
Acquisition |  |
GloFish [Member] | Home And Personal Care [Member] |  |
Goodwill [Line Items] |  |
Acquisition |  |

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 + Details
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- Definition Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 + Details
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