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Derivative Instruments (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 30, 2013
Dec. 29, 2012
Derivative Instruments and Hedging Activities Disclosure [Abstract]    
Net derivative gains (losses) on closed hedge instruments in AOCI that will be realized in earnings when the hedged items impact earnings $ 1.7 $ 0.3
Notional amount of receive-variable/pay-fixed interest rate swaps 250.0  
Receive-variable/pay-fixed interest rate swaps, maturity period August 2017  
Net AOCI balance 12.3  
Net current deferred gains expected to be realized $ 4.3