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Derivative Financial Instruments (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Mar. 31, 2012
Apr. 02, 2011
Mar. 31, 2012
Apr. 02, 2011
Mar. 31, 2012
Other Current Assets [Member]
Sep. 30, 2011
Other Current Assets [Member]
Fair value of our forward contracts         $ 0.2 $ 5.5
Net losses on foreign currency exposures 2.4 1.1 4.6 3.3    
Net realized and unrealized (gain) loss on forward contracts (excluding the underlying foreign currency exposure being hedged) $ 1.7 $ (6.5) $ 2.4 $ (5.2)