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Acquisitions - Summary of Acquisition and Integration Related Charges Incurred (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Business Acquisition [Line Items]        
Total acquisition and integration related charges $ 4.5 $ 3.3 $ 9.7 $ 6.6
AAG Acquisition [Member]        
Business Acquisition [Line Items]        
Total acquisition and integration related charges 0.4 0.6 0.6 1.9
HHI Business        
Business Acquisition [Line Items]        
Total acquisition and integration related charges 1.9 1.9 4.6 3.8
Petmatrix LLC [Member]        
Business Acquisition [Line Items]        
Total acquisition and integration related charges 2.1 0.0 3.7 0.0
Other        
Business Acquisition [Line Items]        
Total acquisition and integration related charges $ 0.1 $ 0.8 $ 0.8 $ 0.9