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Supplemental Statement of Operations Information (Details) (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Included in selling, general and administrative expenses:      
Research and development $ 12.9 $ 14.9 $ 14.4
Advertising 5.0 5.2 4.7
Interest expense, net:      
Deferred financing fees amortization 1.9 2.0 2.0
Other interest expense 0.5 0.3 0.2
Interest Expense 24.0 27.9 50.0
Interest income (0.4) (0.3) (0.4)
Interest expense, net (23.6) (27.6) (49.6)
Secured Debt [Member]      
Interest expense, net:      
Debt instrument interest expense 20.5 17.5 0.0
Seven Point Three Seven Five Senior Subordinated Notes [Member]      
Interest expense, net:      
Debt instrument interest expense 0.0 4.0 30.6
Eight Point Seven Five Senior Unsecured Notes [Member]      
Interest expense, net:      
Debt instrument interest expense 0.0 2.4 16.0
ABL Agreement [Member]      
Interest expense, net:      
Debt instrument interest expense $ 1.1 $ 1.7 $ 1.2