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Supplemental Statement of Operations Information (Details) (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Schedule of Statement of Operations Supplemental Disclosures [Line Items]      
Restructuring Reserve $ 0.9 $ 3.3  
Included in selling, general and administrative expenses:      
Research and development 11.6 12.1 $ 9.9
Advertising 7.1 5.2 4.0
Interest expense, net:      
Interest rate swap contracts 0.6 1.9 0.0
Deferred financing fees amortization 1.6 1.8 1.9
Other interest expense 0.6 0.6 0.5
Interest Expense 25.3 24.2 24.0
Interest income (4.4) (2.0) (0.4)
Interest expense, net (20.9) (22.2) (23.6)
Other Cost and Expense, Operating 10.5 10.4 7.2
Secured Debt [Member]      
Interest expense, net:      
Debt instrument interest expense 14.4 19.1 20.5
Seven Point Three Seven Five Senior Subordinated Notes [Member]      
Interest expense, net:      
Debt instrument interest expense 7.5 0.0 0.0
ABL Agreement [Member]      
Interest expense, net:      
Debt instrument interest expense $ 0.6 0.8 1.1
Statesboro [Member]      
Interest expense, net:      
Other Cost and Expense, Operating     $ 4.1
Mueller One Project [Member]      
Interest expense, net:      
Other Cost and Expense, Operating   $ 4.6