Stockholders' Equity (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified	2 Months Ended	3 Months Ended									12 Months Ended
	Feb. 22, 2013	Mar. 31, 2013	Dec. 30, 2012	Sep. 30, 2012	Jul. 01, 2012	Apr. 01, 2012	Jan. 01, 2012	Oct. 02, 2011	Jul. 03, 2011	Apr. 03, 2011	Dec. 30, 2012	Jan. 01, 2012	Jan. 02, 2011	Oct. 24, 2012	Aug. 31, 2010	Oct. 23, 2008
Stockholders' Equity Note [Abstract]
Stock repurchase program, number of shares authorized to be repurchased														6,000,000		10,000,000
Stock repurchase program, number of additional shares authorized to be repurchased															5,000,000
Number of common stock repurchased in open market	2,600,000										0	4,000,000	3,000,000
Repurchases of common stock	$ 89.0											$ 107.8	$ 71.5
Stock repurchase program, number of shares remained available for repurchase			6,000,000								6,000,000
Repurchased shares of common stock to satisfy statutory tax withholding obligation requirements											82,186	84,243	57,551
Aggregate cost of repurchased common stock to satisfy statutory tax withholding obligation requirements											2.1	2.2	1.3
Cash dividends (per share)		$ 0.07	$ 0.07	$ 0.07	$ 0.07	$ 0.07	$ 0.07	$ 0.07	$ 0.07	$ 0.07	$ 0.28	$ 0.28
Dividends accrued			$ 8.0								$ 8.0