Fair Value Measurements and Other-Than-Temporary Impairments - Reconciliation of All Assets and Liabilities Measured at Fair Value on Recurring Basis (Parenthetical) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
	Mar. 30, 2013	Sep. 28, 2013	Sep. 29, 2012
Fair Value Disclosures [Abstract]
Available-for-sale auction rate securities tender value as percent of par value	95.00%	95.00%
Realized gains on these calls	$ 0.2	$ 0.2	$ 0.5