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Acquisitions - Summary of Acquisition and Integration Related Charges Incurred (Detail) - USD ($)	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Business Acquisition [Line Items]
Total acquisition and integration related charges	$ 62,100,000	$ 24,400,000	$ 62,400,000
AAG Acquisition [Member]
Business Acquisition [Line Items]
Total acquisition and integration related charges	21,800,000	0	0
HHI Business
Business Acquisition [Line Items]
Total acquisition and integration related charges	12,000,000	11,100,000	36,900,000
Salix Animal Health LLC [Member]
Business Acquisition [Line Items]
Total acquisition and integration related charges	10,700,000	0
European IAMS and Eukanuba [Member]
Business Acquisition [Line Items]
Total acquisition and integration related charges	9,300,000	0	0
Compass Production Partners [Member]
Business Acquisition [Line Items]
Total acquisition and integration related charges	1,900,000	800,000	9,200,000
Other
Business Acquisition [Line Items]
Total acquisition and integration related charges	$ 6,400,000	$ 12,500,000	$ 16,300,000

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