Derivative Instruments (Net Loss on Gas Commodity Swap Contracts Designated as Cash Flow Hedges) (Details) (Cash Fow Hedges, Designated as Hedging Instrument, Gas Commodity Swap Contract, USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Jun. 28, 2013	Jun. 29, 2012	Jun. 28, 2013	Jun. 29, 2012
Derivative Instruments, Gain (Loss) [Line Items]
Net gain (loss) on commodity swap contracts	$ (0.3)	$ (0.9)	$ (1.1)	$ (2.8)
Cost of sales
Derivative Instruments, Gain (Loss) [Line Items]
Net gain (loss) on commodity swap contracts	(0.1)	(0.3)	(0.3)	(0.8)
Selling, general and administrative
Derivative Instruments, Gain (Loss) [Line Items]
Net gain (loss) on commodity swap contracts	$ (0.2)	$ (0.6)	$ (0.8)	$ (2.0)