Consolidated Statements of Stockholders' Equity (Unaudited) (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 Apr. 01, 2012	$ 29.8	$ 665.2	$ 24.5	$ 36.6	$ 3.5	$ (66.0)	$ (0.6)
Other comprehensive income, net of tax			1.2					1.2
Net earnings		15.0						15.0
Dividends		(1.9)
Exercise of stock options, restricted stock and other	(2.4)
Exercise of stock options, restricted stock awards and other						3.4
Balance at Jul. 01, 2012	27.4	678.3	25.7	36.6	3.5	(62.6)	(0.6)	708.3
Balance at Jan. 01, 2012	28.8	657.5	16.2	36.6	3.5	(66.3)	(0.6)
Other comprehensive income, net of tax			9.5					9.5
Net earnings		24.6						24.6
Dividends		(3.8)
Exercise of stock options, restricted stock and other	(1.4)
Exercise of stock options, restricted stock awards and other						3.7
Balance at Jul. 01, 2012	27.4	678.3	25.7	36.6	3.5	(62.6)	(0.6)	708.3
Balance at Dec. 30, 2012	27.1	700.0	35.4	36.6	3.5	(61.0)	(0.6)	741.0
Other comprehensive income, net of tax			14.4					14.4
Net earnings		22.9						22.9
Dividends		(3.8)
Exercise of stock options, restricted stock and other	1.8
Exercise of stock options, restricted stock awards and other						1.0
Balance at Jun. 30, 2013	28.9	719.1	49.8	36.6	3.5	(60.0)	(0.6)	777.3
Balance at Mar. 31, 2013	27.8	711.0	40.7	36.6	3.5	(60.5)	(0.6)
Other comprehensive income, net of tax			9.1					9.1
Net earnings		10.0						10.0
Dividends		(1.9)
Exercise of stock options, restricted stock and other	1.1
Exercise of stock options, restricted stock awards and other						0.5
Balance at Jun. 30, 2013	$ 28.9	$ 719.1	$ 49.8	$ 36.6	$ 3.5	$ (60.0)	$ (0.6)	$ 777.3