Derivative Instruments (Schedule of Net Losses on Gas Commodity Swap Contracts) (Details) (Cash Flow Hedges, Designated as Hedging Instrument, Gas Commodity Swap Contract, USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
	Mar. 29, 2013	Mar. 29, 2013
Derivative Instruments, Gain (Loss) [Line Items]
Net loss on commodity swap contracts	$ 0.4	$ 0.8
Cost of sales
Derivative Instruments, Gain (Loss) [Line Items]
Net loss on commodity swap contracts	0.1	0.2
Selling, general and administrative
Derivative Instruments, Gain (Loss) [Line Items]
Net loss on commodity swap contracts	$ 0.3	$ 0.6