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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	Sep. 30, 2016
Goodwill [Line Items]
As of September 30, beginning	$ 2,277.1	$ 2,133.3
Foreign currency impact	(6.1)	8.8
Impairment	(92.5)		$ (10.7)
As of September 30, ending	2,178.5	2,277.1	2,133.3
Hardware & Home Improvement [Member]
Goodwill [Line Items]
As of September 30, beginning	708.7	702.8
Foreign currency impact	(4.4)	5.9
Impairment
As of September 30, ending	704.3	708.7	702.8
Global Pet Supplies [Member]
Goodwill [Line Items]
As of September 30, beginning	437.1	299.8
Foreign currency impact	(1.2)	2.3
Impairment
As of September 30, ending	435.9	437.1	299.8
Home and Garden [Member]
Goodwill [Line Items]
As of September 30, beginning	196.5	196.5
Foreign currency impact
Impairment
As of September 30, ending	196.5	196.5	196.5
Global Auto Care [Member]
Goodwill [Line Items]
As of September 30, beginning	934.8	934.2
Foreign currency impact	(0.5)	0.6
Impairment	(92.5)
As of September 30, ending	$ 841.8	934.8	$ 934.2
PetMatrix [Member]
Goodwill [Line Items]
Adjustments		123.8
PetMatrix [Member] \| Hardware & Home Improvement [Member]
Goodwill [Line Items]
Adjustments
PetMatrix [Member] \| Global Pet Supplies [Member]
Goodwill [Line Items]
Adjustments		123.8
PetMatrix [Member] \| Home and Garden [Member]
Goodwill [Line Items]
Adjustments
PetMatrix [Member] \| Global Auto Care [Member]
Goodwill [Line Items]
Adjustments
GloFish [Member]
Goodwill [Line Items]
Adjustments		11.2
GloFish [Member] \| Hardware & Home Improvement [Member]
Goodwill [Line Items]
Adjustments
GloFish [Member] \| Global Pet Supplies [Member]
Goodwill [Line Items]
Adjustments		11.2
GloFish [Member] \| Home and Garden [Member]
Goodwill [Line Items]
Adjustments
GloFish [Member] \| Global Auto Care [Member]
Goodwill [Line Items]
Adjustments