CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Thousands		Total		Common Stock	Paid-in Capital	Treasury Stock	Retained Earnings	Accumulated Other Comprehensive Income (loss)	Accumulated Defined Benefit Plans Adjustment Attributable to Parent		Interest Rate Swap Retained Earnings	Interest Rate Swap Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Balance, Beginning at Dec. 31, 2016		$ 1,265,318		$ 144	$ 355,287	$ (205,280)	$ 1,399,490	$ (284,323)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings		298,128		0	0	0	298,128	0
Currency translation adjustments		46,690		0	0	0	0	46,690
Change in unrecognized pension benefit costs, net of tax		(29,669)		0	0	0	0	(29,669)
Unrealized gain on interest rate swap, net of tax		883		0	0	0	0	883
Stock compensation		6,237		0	6,237	0	0	0
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs		13,399		1	13,398	0	0	0
Purchase of treasury stock		(239,838)		0	0	(239,838)	0	0
Balance, Ending at Dec. 30, 2017		1,361,148		145	374,922	(445,118)	1,697,618	(266,419)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings		317,152		0	0	0	317,152	0
Cumulative Effect on Retained Earnings, Net of Tax | Accounting Standards Update 2018-02	[1]	0		0	0	0	(1,132)	1,132
Cumulative Effect on Retained Earnings, Net of Tax | Accounting Standards Update 2014-09	[2]	(4,405)		0	0	0	(4,405)	0
Currency translation adjustments		(43,050)		0	0	0	0	(43,050)
Change in unrecognized pension benefit costs, net of tax		32,125
Change in unrecognized pension benefit costs, net of tax | Accounting Standards Update 2018-02		32,612		0	0	0	0	32,612
Unrealized gain on interest rate swap, net of tax		868
Unrealized gain on interest rate swap, net of tax | Accounting Standards Update 2018-02		(751)		0	0	0	0	(751)
Stock compensation		2,497		0	2,497	0	0	0
Balance, Ending at Dec. 29, 2018		1,665,203		145	377,419	(445,118)	2,009,233	(276,476)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adoption of ASU 2018-02									$ 500
Adoption of ASU 2018-02 | Accounting Standards Update 2018-02		1,132	[3]						(487)	[3]	$ (1,600)	$ 1,619	[3]
Stranded Tax Effects Reclassified from OCI to Retained Earnings | Accounting Standards Update 2018-02		1,100
Net earnings		352,240		0	0	0	352,240	0
Cumulative Effect on Retained Earnings, Net of Tax		(100)
Cumulative Effect on Retained Earnings, Net of Tax | Accounting Standards Update 2017-12		0		0	0	0	(11)	11
Currency translation adjustments		7,066		0	0	0	0	7,066
Change in unrecognized pension benefit costs, net of tax		(57,398)		0	0	0	0	(57,398)
Unrealized gain on interest rate swap, net of tax		(24,125)
Unrealized gain on interest rate swap, net of tax | Accounting Standards Update 2017-12		(24,136)		0	0	0	0	(24,136)
Stock compensation		8,133		0	8,133	0	0	0
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs		1,850		0	1,850	0	0	0
Purchase of treasury stock		(6,144)		0	0	(6,144)	0	0
Balance, Ending at Dec. 28, 2019		1,946,814		$ 145	$ 387,402	$ (451,262)	$ 2,361,462	$ (350,933)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adoption of ASU 2018-02 | Accounting Standards Update 2017-12	[4]	$ 11							$ 0			$ 11

[1] As of December 31, 2017, the company adopted ASU No. 2018-02, Income Statement-Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income. The adoption of this guidance resulted in the reclassification of $1.1 million, including $1.6 million related to interest rate swap and $(0.5) million related to pensions, of stranded tax effects resulting from the Tax Cuts and Jobs Act of 2017 from accumulated other comprehensive income to retained earnings.

[2] As of December 31, 2017, the company adopted ASU No. 2014-09, Revenue from Contracts with Customers (ASC 606) using the modified retrospective method to contracts that were not completed as of December 30, 2017. The adoption of this guidance resulted in the recognition of $(4.4) million as an adjustment to the opening balance of retained earnings.

[3] As of December 31, 2017, the company adopted ASU No. 2018-02, Income Statement-Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income. The adoption of this guidance resulted in the reclassification of $1.1 million of stranded tax effects resulting from the Tax Cuts and Jobs Act of 2017 from accumulated other comprehensive income to retained earnings.

[4] (3) As of December 30, 2018, the company adopted ASU No. 2017-12, "Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities" using the modified retrospective method. The adoption of this guidance resulted in the recognition of less than $(0.1) million as an adjustment to the opening balance of retained earnings.