Consolidated Statements of Stockholders' Equity (USD $) In Millions	Additional Paid-in Capital [Member]	Earnings Invested In The Business [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Common Class A [Member]	Common Class B [Member]	Common Class A Treasury Stock [Member]	Common Class B Treasury Stock [Member]	Total
Balance at Jan. 03, 2010	$ 36.9	$ 571.5	$ 25.1	$ 36.6	$ 3.5	$ (106.6)	$ (0.6)
Other comprehensive income (loss), net of tax			3.9					3.9
Net earnings		26.1						26.1
Exercise of stock options, restricted stock awards and other	(8.9)
Exercise of stock options, restricted stock awards and other						36.3
Balance at Jan. 02, 2011	28.0	597.6	29.0	36.6	3.5	(70.3)	(0.6)	623.8
Balance at Jan. 02, 2011						(70.3)	(0.6)
Other comprehensive income (loss), net of tax			(12.8)					(12.8)
Net earnings		63.7						63.7
Dividends		(3.8)						(3.8)
Exercise of stock options, restricted stock awards and other	0.8
Exercise of stock options, restricted stock awards and other						4.0
Balance at Jan. 01, 2012	28.8	657.5	16.2	36.6	3.5	(66.3)	(0.6)	675.7
Balance at Jan. 01, 2012						(66.3)	(0.6)
Other comprehensive income (loss), net of tax			19.2					19.2
Net earnings		50.1						50.1
Dividends		(7.6)						(7.6)
Exercise of stock options, restricted stock awards and other	(1.7)
Exercise of stock options, restricted stock awards and other						5.3
Balance at Dec. 30, 2012	27.1	700.0	35.4	36.6	3.5			741.0
Balance at Dec. 30, 2012						$ (61.0)	$ (0.6)