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Commitments And Contingencies (Narrative) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Sep. 30, 2017
Commitments And Contingencies [Abstract]          
Estimated costs associated with environmental remediation activities $ 4.2   $ 4.2   $ 4.4
Product liability accruals 4.8   4.8   5.3
Product warranty accruals 7.3   7.3   $ 6.4
Pet safety recall 5.1 $ 24.9 16.3 $ 24.9  
Inventory write-offs associated with product safety recall 2.0   3.6    
Customer losses, returned or disposed product 0.5   1.6    
Incremental costs to dispose of product and operational expenses $ 2.6   $ 11.1