Other Comprehensive Income (Schedule of OCI) (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 26, 2020	Jun. 27, 2020	Mar. 28, 2020	Sep. 28, 2019	Jun. 29, 2019	Mar. 30, 2019	Sep. 26, 2020	Sep. 28, 2019
Before-Tax Amount:
Amortization of prior service cost	$ 9			$ 9			$ 25	$ 27
Amortization of actuarial loss	854			1,146			2,562	3,439
Total defined benefit pension plans	863			1,155			2,587	3,466
Foreign currency translation	39,237			(48,954)			(5,798)	(37,695)
Other Comprehensive income (loss)	40,902			(56,546)			(1,869)	(40,865)
Tax (Expense) or Benefit:
Amortization of prior service cost	(2)			(2)			(6)	(7)
Amortization of actuarial loss	(213)			(294)			(638)	(883)
Total defined benefit pension plans	(215)			(296)			(644)	(890)
Foreign currency translation	(1,383)			1,328			(1,445)	1,509
Other Comprehensive income (loss)	(2,012)			3,705			(2,645)	2,850
Net-of-Tax Amount:
Amortization of prior service cost	7			7			19	20
Amortization of actuarial loss	641			852			1,924	2,556
Total defined benefit pension plans	648			859			1,943	2,576
Foreign currency translation	37,854	$ 20,139	$ (65,236)	(47,626)	$ 16,326	$ (4,886)	(7,243)	(36,186)
Net current-period other comprehensive income	38,890			(52,841)			(4,514)	(38,015)
Corn Option [Member]
Before-Tax Amount:
Loss (gain) reclassified to net income	229			206			1,168	169
Gain (loss) activity recognized in other comprehensive loss	(3,588)			542			(1,939)	609
Total swap derivatives	(3,359)			748			(771)	778
Tax (Expense) or Benefit:
Loss (gain) reclassified to net income	(57)			(54)			(292)	(44)
Gain (loss) activity recognized in other comprehensive loss	898			(141)			485	(159)
Total swap derivatives	841			(195)			193	(203)
Net-of-Tax Amount:
Loss (gain) reclassified to net income	172			152			876	125
Gain (loss) activity recognized in other comprehensive loss	(2,690)			401			(1,454)	450
Total swap derivatives	(2,518)	1,804	136	553	22		(578)	575
Heating Oil Swaps And Options [Member]
Before-Tax Amount:
Gain (loss) activity recognized in other comprehensive loss	1,992			(2,268)			4,565	606
Total swap derivatives	1,992			(2,268)			4,565	606
Tax (Expense) or Benefit:
Gain (loss) activity recognized in other comprehensive loss	(498)			585			(1,141)	(156)
Total swap derivatives	(498)			585			(1,141)	(156)
Net-of-Tax Amount:
Gain (loss) activity recognized in other comprehensive loss	1,494			(1,683)			3,424	450
Total swap derivatives	1,494			(1,683)			3,424	450
Foreign Exchange Contract [Member]
Before-Tax Amount:
Loss (gain) reclassified to net income	(5,317)			1,178			(10,564)	1,465
Gain (loss) activity recognized in other comprehensive loss	7,486			(8,405)			8,112	(9,485)
Total swap derivatives	2,169			(7,227)			(2,452)	(8,020)
Tax (Expense) or Benefit:
Loss (gain) reclassified to net income	385			(362)			1,690	(473)
Gain (loss) activity recognized in other comprehensive loss	(1,142)			2,645			(1,298)	3,063
Total swap derivatives	(757)			2,283			392	2,590
Net-of-Tax Amount:
Loss (gain) reclassified to net income	(4,932)			816			(8,874)	992
Gain (loss) activity recognized in other comprehensive loss	6,344			(5,760)			6,814	(6,422)
Total swap derivatives	1,412	5,679	(9,151)	(4,944)	1,451	(1,937)	$ (2,060)	$ (5,430)
Accumulated Other Comprehensive Loss
Net-of-Tax Amount:
Foreign currency translation	37,878	20,779	(65,147)	(47,630)	17,797	(6,645)
Accumulated Other Comprehensive Loss | Corn Option [Member]
Net-of-Tax Amount:
Total swap derivatives	(2,518)	1,804	136	553	22
Accumulated Other Comprehensive Loss | Foreign Exchange Contract [Member]
Net-of-Tax Amount:
Total swap derivatives	$ 1,412	$ 5,679	$ (9,151)	$ (4,944)	$ 1,451	$ (1,937)