Quarterly Financial Data (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended									12 Months Ended			0 Months Ended	3 Months Ended	12 Months Ended
	Dec. 31, 2011	Oct. 01, 2011	Jul. 02, 2011	Apr. 02, 2011	Jan. 01, 2011		Oct. 02, 2010	Jul. 03, 2010	Apr. 03, 2010	Dec. 31, 2011	Jan. 01, 2011	Jan. 02, 2010	Dec. 17, 2010 Griffin Transaction [Member]	Jan. 01, 2011 Griffin Transaction [Member]	Jan. 01, 2011 Griffin Transaction [Member]
Net sales	$ 430,866	$ 455,875	$ 470,610	$ 439,898	$ 227,232		$ 168,685	$ 166,210	$ 162,782	$ 1,797,249	$ 724,909	$ 597,806
Operating income	59,477	74,761	92,235	88,133	24,698		19,318	18,914	19,583	314,606	82,513	70,939
Income from operations before income taxes	50,328	66,141	82,486	73,339	16,923		17,704	17,577	18,139	272,294	70,343	66,879
Net income	29,497	41,132	52,227	46,562	10,012	[1]	11,382	11,371	11,478	169,418	44,243	41,790			1,900
Basic earnings per share	$ 0.25	$ 0.35	$ 0.45	$ 0.43	$ 0.12		$ 0.14	$ 0.14	$ 0.14	$ 1.47	$ 0.53	$ 0.51
Diluted (in dollars per share)	$ 0.25	$ 0.35	$ 0.44	$ 0.43	$ 0.12		$ 0.14	$ 0.14	$ 0.14	$ 1.47	$ 0.53	$ 0.51
Acquisition costs										$ 0	$ 10,798	$ 468	$ 10,600	$ 13,700

[1] Included in net income in the fourth quarter of fiscal 2010 are costs incurred as part of the Griffin Transaction for consulting, legal and financing in the amount of approximately $13.7 million.