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Business Segments (Details) - USD ($) $ in Thousands		3 Months Ended								12 Months Ended
		Dec. 29, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2016	Oct. 01, 2016	Jul. 02, 2016	Apr. 02, 2016	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Net sales		$ 853,130	$ 812,576	$ 846,646	$ 875,374	$ 952,549	$ 936,262	$ 894,930	$ 878,510	$ 3,387,726	$ 3,662,251	$ 3,391,928
Cost of sales and operating expenses										2,647,083	2,875,443	2,635,333
Selling, general and administrative expense										309,264	343,502	311,552
Restructuring Costs and Asset Impairment Charges										14,965	0	0
Depreciation and amortization										321,192	302,100	289,908
Segment operating income/(loss)		23,614	18,186	21,668	31,754	36,139	34,396	38,164	32,507	95,222	141,206	154,734
Equity in net income of unconsolidated subsidiaries										159,229	28,504	70,379
Total other expense										(136,476)	(105,510)	(102,574)
Income before income taxes		50,183	$ (6,540)	$ (27,455)	$ 101,787	$ 21,934	$ 14,980	$ 18,070	$ 9,216	117,975	64,200	122,539
Segment assets		4,889,354								4,889,354	4,958,225
Capital expenditures:	[1]									321,896	274,168	243,523
Capital assets		31,600								31,600
Long-Lived Assets		3,991,412								3,991,412	4,001,780
North America
Segment Reporting Information [Line Items]
Net sales										1,817,001	1,937,027	1,817,659
Long-Lived Assets		2,562,389								2,562,389	2,468,111
Europe
Segment Reporting Information [Line Items]
Net sales										1,225,461	1,372,750	1,225,397
Long-Lived Assets		1,219,084								1,219,084	1,292,020
China
Segment Reporting Information [Line Items]
Net sales										210,657	209,780	218,480
Long-Lived Assets		136,711								136,711	151,760
South America
Segment Reporting Information [Line Items]
Net sales										53,206	60,111	55,089
Long-Lived Assets		64,916								64,916	81,247
Other
Segment Reporting Information [Line Items]
Long-Lived Assets		8,312								8,312	8,642
Feed Ingredients [Member]
Segment Reporting Information [Line Items]
Net sales										1,952,555	2,239,492	2,089,145
Cost of sales and operating expenses										1,498,698	1,744,631	1,624,804
Gross Margin										453,857	494,861	464,341
Selling, general and administrative expense										176,722	178,347	167,287
Acquisition costs												0
Restructuring Costs and Asset Impairment Charges										0
Depreciation and amortization										194,292	184,172	178,845
Segment operating income/(loss)										82,843	132,342	118,209
Equity in net income of unconsolidated subsidiaries										(550)	265	467
Segment income										82,293	132,607	118,676
Segment assets		2,566,106								2,566,106	2,614,545
Capital expenditures:										237,215	191,953	167,313
Feed Ingredients [Member] | North America
Segment Reporting Information [Line Items]
Net sales										1,586,930	1,696,081	1,580,252
Feed Ingredients [Member] | Europe
Segment Reporting Information [Line Items]
Net sales										329,341	503,786	467,124
Feed Ingredients [Member] | China
Segment Reporting Information [Line Items]
Net sales										28,288	32,103	36,193
Feed Ingredients [Member] | South America
Segment Reporting Information [Line Items]
Net sales										0	0	0
Food Ingredients [Member]
Segment Reporting Information [Line Items]
Net sales										1,139,126	1,156,976	1,055,725
Cost of sales and operating expenses										917,859	920,383	828,072
Gross Margin										221,267	236,593	227,653
Selling, general and administrative expense										91,546	104,644	97,168
Acquisition costs												0
Restructuring Costs and Asset Impairment Charges										14,965
Depreciation and amortization										80,988	75,010	70,120
Segment operating income/(loss)										33,768	56,939	60,365
Equity in net income of unconsolidated subsidiaries										0	0	0
Segment income										33,768	56,939	60,365
Segment assets		1,401,291								1,401,291	1,499,027
Capital expenditures:										51,659	50,099	50,020
Food Ingredients [Member] | North America
Segment Reporting Information [Line Items]
Net sales										181,213	193,950	188,506
Food Ingredients [Member] | Europe
Segment Reporting Information [Line Items]
Net sales										648,933	650,177	560,116
Food Ingredients [Member] | China
Segment Reporting Information [Line Items]
Net sales										182,369	177,677	182,287
Food Ingredients [Member] | South America
Segment Reporting Information [Line Items]
Net sales										53,206	60,111	55,089
Fuel Ingredients [Member]
Segment Reporting Information [Line Items]
Net sales										296,045	265,783	247,058
Cost of sales and operating expenses										230,526	210,429	182,457
Gross Margin										65,519	55,354	64,601
Selling, general and administrative expense										(4,770)	10,355	6,766
Acquisition costs												0
Restructuring Costs and Asset Impairment Charges										0
Depreciation and amortization										34,981	31,019	28,531
Segment operating income/(loss)										35,308	13,980	29,304
Equity in net income of unconsolidated subsidiaries										159,779	28,239	69,912
Segment income										195,087	42,219	99,216
Segment assets		761,817								761,817	688,890
Capital expenditures:										27,121	24,707	22,323
Fuel Ingredients [Member] | North America
Segment Reporting Information [Line Items]
Net sales										48,858	46,996	48,901
Fuel Ingredients [Member] | Europe
Segment Reporting Information [Line Items]
Net sales										247,187	218,787	198,157
Fuel Ingredients [Member] | China
Segment Reporting Information [Line Items]
Net sales										0	0	0
Fuel Ingredients [Member] | South America
Segment Reporting Information [Line Items]
Net sales										0	0	0
Corporate Segment [Member]
Segment Reporting Information [Line Items]
Net sales										0	0	0
Cost of sales and operating expenses										0	0	0
Gross Margin										0	0	0
Selling, general and administrative expense										45,766	50,156	40,331
Acquisition costs												401
Restructuring Costs and Asset Impairment Charges										0
Depreciation and amortization										10,931	11,899	12,412
Segment operating income/(loss)										(56,697)	(62,055)	(53,144)
Equity in net income of unconsolidated subsidiaries										0	0	0
Segment income										(56,697)	(62,055)	(53,144)
Segment assets		160,140								160,140	155,763
Capital expenditures:										5,901	7,409	3,867
Operating Segments [Member]
Segment Reporting Information [Line Items]
Net sales										3,387,726	3,662,251	3,391,928
Cost of sales and operating expenses										2,647,083	2,875,443	2,635,333
Gross Margin										740,643	786,808	756,595
Selling, general and administrative expense										309,264	343,502	311,552
Acquisition costs												401
Restructuring Costs and Asset Impairment Charges										14,965
Depreciation and amortization										321,192	302,100	289,908
Segment operating income/(loss)										95,222	141,206	154,734
Equity in net income of unconsolidated subsidiaries										159,229	28,504	70,379
Segment income										254,451	169,710	$ 225,113
Segment assets		$ 4,889,354								$ 4,889,354	$ 4,958,225
[1] Excludes capital assets acquired by acquisition in fiscal 2018 of approximately $31.6 million and excludes immaterial capital assets acquired by acquisition in fiscal 2017 and fiscal 2016.

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