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Other (Income) Expense, Net (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2010
Component of Other Expense, Nonoperating [Line Items]      
Royalty income, net $ (4.9) $ (4.3) $ (4.1)
Gain from peat transaction       (0.9)
Franchise fees (0.3) (0.3) (0.5)
Foreign currency losses (0.7) 1.4 0.3
Other 3.0 2.3 (0.4)
Total $ (2.9) $ (0.9) $ (5.6)