Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 03, 2015	Dec. 28, 2013	Dec. 29, 2012
Before-Tax Amount
Actuarial (loss)/gain recognized	$ (34,547)	$ 18,773	$ (6,768)
Amortization of actuarial loss	2,078	5,202	4,756
Actuarial prior service cost recognized	1,140		0
Amortization of prior service costs	23	142	103
Total defined benefit pension plans	(31,306)	24,117	1,909
Tax (Expense) or Benefit
Actuarial (loss)/gain recognized	12,001	(6,904)	2,623
Amortization of actuarial loss	(806)	(2,018)	(1,844)
Actuarial prior service cost recognized	(261)		0
Amortization of prior service costs	(9)	(55)	(39)
Total defined benefit pension plans	10,925	(8,977)	740
Net-of-Tax Amount
Actuarial (loss)/gain recognized	(22,546)	11,869	(4,145)
Amortization of actuarial loss	1,272	3,184	2,912
Actuarial prior service cost recognized	879	0	0
Amortization of prior service costs	14	87	64
Total defined benefit pension plans	(20,381)	15,140	(1,169)
Before-Tax Amount
Gain/(loss) recognized in other comprehensive income (loss)	1,800	7,600
Tax (Expense) or Benefit
Gain/(loss) recognized in other comprehensive income (loss)	(700)	(2,900)
Net-of-Tax Amount
Other comprehensive income/(loss)	(159,431)	11,686	(693)
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent	11,794	(9,780)	268
Total other comprehensive income, net of tax	(147,637)	1,906	(425)
Foreign currency translation adjustments, net of tax	(125,884)	(14,502)	0
Natural Gas Swap [Member]
Before-Tax Amount
Loss/(gain) reclassified to net income	(196)	(41)	1,267
Gain/(loss) recognized in other comprehensive income (loss)	11	248	(628)
Total natural gas derivatives	(185)	207	639
Tax (Expense) or Benefit
Loss/(gain) reclassified to net income	76	16	(491)
Gain/(loss) recognized in other comprehensive income (loss)	(4)	(96)	243
Total natural gas derivatives	72	(80)	(248)
Net-of-Tax Amount
Loss/(gain) reclassified to net income	(120)	(25)	776
Gain/(loss) recognized in other comprehensive income (loss)	7	152	(385)
Total natural gas derivatives	(113)	127	391
Interest Rate Swap [Member]
Before-Tax Amount
Loss/(gain) reclassified to net income			260
Tax (Expense) or Benefit
Loss/(gain) reclassified to net income			(101)
Net-of-Tax Amount
Loss/(gain) reclassified to net income			159
Total natural gas derivatives	0	0	159
Corn Option [Member]
Before-Tax Amount
Loss/(gain) reclassified to net income	(3,868)	(5,486)
Gain/(loss) recognized in other comprehensive income (loss)	1,812	7,350	317
Total natural gas derivatives	(2,056)	1,864	317
Tax (Expense) or Benefit
Loss/(gain) reclassified to net income	1,501	2,129
Gain/(loss) recognized in other comprehensive income (loss)	(704)	(2,852)	(123)
Total natural gas derivatives	797	723	(123)
Net-of-Tax Amount
Loss/(gain) reclassified to net income	(2,367)	(3,357)
Gain/(loss) recognized in other comprehensive income (loss)	1,108	4,498	194
Total natural gas derivatives	(1,259)	1,141	194
Accumulated Other Comprehensive Income (Loss) [Member]
Net-of-Tax Amount
Total defined benefit pension plans	(20,381)	15,140	(1,169)
Net-of-Tax Amount
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax	(125,884)	(14,502)
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax	0	0
Foreign currency translation adjustments, net of tax	(125,884)	(14,502)
Accumulated Other Comprehensive Income (Loss) [Member] | Natural Gas Swap [Member]
Net-of-Tax Amount
Total natural gas derivatives	(113)	127	391
Accumulated Other Comprehensive Income (Loss) [Member] | Interest Rate Swap [Member]
Net-of-Tax Amount
Total natural gas derivatives			159
Accumulated Other Comprehensive Income (Loss) [Member] | Corn Option [Member]
Net-of-Tax Amount
Total natural gas derivatives	$ (1,259)	$ 1,141	$ 194