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
	Dec. 28, 2012
Derivative Instruments, Gain (Loss) [Line Items]
Net loss on commodity swap contracts	$ (0.4)
Cost of sales
Derivative Instruments, Gain (Loss) [Line Items]
Net loss on commodity swap contracts	(0.1)
Selling, general and administrative
Derivative Instruments, Gain (Loss) [Line Items]
Net loss on commodity swap contracts	$ (0.3)