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Acquisitions (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions					12 Months Ended
	Jul. 13, 2018	Jun. 01, 2017	May 18, 2017	May 12, 2017	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Business Acquisition [Line Items]
Par value					$ 0.01	$ 0.01
Upward adjustment	$ 200.0
General and administrative expenses					$ 323.9	$ 318.9	$ 346.0
Goodwill					2,178.5	2,277.1	$ 2,133.3
Spectrum Merger [Member]
Business Acquisition [Line Items]
Par value	$ 0.01
General and administrative expenses					$ 45.9	$ 7.6
PetMatrix [Member]
Business Acquisition [Line Items]
Acquisition date					Jun. 01, 2017
Goodwill		$ 123.8
Goodwill deductible for tax purposes		$ 123.8
Estimated income tax rate		35.00%
Discounted rate		12.00%
Purchase price		$ 255.2
PetMatrix [Member] | Minimum [Member]
Business Acquisition [Line Items]
Expected growth rate		2.00%
PetMatrix [Member] | Maximum [Member]
Business Acquisition [Line Items]
Expected growth rate		20.00%
Customer retention rate		98.00%
GloFish [Member]
Business Acquisition [Line Items]
Acquisition date					May 12, 2017
Goodwill				$ 11.2
Goodwill deductible for tax purposes				$ 11.2
Estimated income tax rate				35.00%
Discounted rate				12.00%
Purchase price				$ 49.7
Shaser [Member]
Business Acquisition [Line Items]
Percentage of remaining non-controlling interest purchased			44.00%
Purchase price			$ 12.6
Increase to additional paid-in capital			$ 24.1

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