Quarterly Financial Data (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended											12 Months Ended
	Dec. 28, 2013		Sep. 28, 2013		Jun. 29, 2013		Mar. 30, 2013	Dec. 29, 2012	Sep. 29, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Business Acquisition [Line Items]
Net sales	$ 428,749	[1]	$ 425,786	[1]	$ 423,593	[1]	$ 445,422	$ 424,915	$ 452,732	$ 436,674	$ 387,108	$ 1,723,550	$ 1,701,429	$ 1,797,249
Operating income	18,536	[1]	41,652	[1]	50,802	[1]	58,576	49,487	65,776	63,968	52,510	169,566	231,741	313,984
Income from operations before income taxes	23,078	[1]	45,024	[1]	42,753	[1]	52,823	44,908	59,307	57,829	44,741	163,678	206,785	272,294
Net income	22,493	[1]	27,651	[1]	26,418	[1]	32,405	28,802	37,172	36,225	28,571	108,967	130,770	169,418
Basic earnings per share	$ 0.18	[1]	$ 0.23	[1]	$ 0.22	[1]	$ 0.27	$ 0.24	$ 0.32	$ 0.31	$ 0.24	$ 0.91	$ 1.11	$ 1.47
Diluted (in dollars per share)	$ 0.18	[1]	$ 0.23	[1]	$ 0.22	[1]	$ 0.27	$ 0.24	$ 0.31	$ 0.31	$ 0.24	$ 0.91	$ 1.11	$ 1.47
Acquisition costs												23,271	0	0
Foreign Currency Transaction Gain (Loss), Unrealized	27,500											27,516	0	0
Terra Transaction and Rothsay and VION Acquisition [Member]
Business Acquisition [Line Items]
Acquisition costs	$ 14,200		$ 8,300		$ 800

[1] Included in net income are $0.8 million in transaction costs in the second quarter of fiscal 2013, $8.3 million in transaction costs in the third quarter of fiscal 2013 and $14.2 million in the fourth quarter relating to the Terra Transaction, Rothsay Acquisition and the VION Acquisition.