CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY Statement - USD ($) $ in Thousands		Total	Common Stock	Paid-in Capital	Treasury Stock	Retained Earnings	Accumulated Other Comprehensive Income (loss)	Accumulated Defined Benefit Plans Adjustment	Interest Rate Swap Retained Earnings	Interest Rate Swap Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent
Balance, Beginning 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		149,408	0	0	0	149,408	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 adjustment		(20,161)	0	0	0	0	(20,161)
Change in unrecognized pension benefit costs, net of tax		6,499
Change in unrecognized pension benefit costs, net of tax | Accounting Standards Update 2018-02		5,367	0	0	0	0	5,367
Unrealized gain on interest rate swaps, net of tax		7,981	0	0	0	0	7,981
Stock compensation		1,818	0	1,818	0	0	0
Balance, Ending at Jun. 30, 2018		1,501,156	145	376,740	(445,118)	1,841,489	(272,100)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive income (loss), adopt of new accounting pronouncement | Accounting Standards Update 2018-02	[3]	1,132						$ (487)		$ 1,619
Balance, Beginning at Mar. 31, 2018		1,440,659	145	375,067	(445,118)	1,757,501	(246,936)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings		83,988	0	0	0	83,988	0
Currency translation adjustment		(41,963)	0	0	0	0	(41,963)
Change in unrecognized pension benefit costs, net of tax		13,754	0	0	0	0	13,754
Unrealized gain on interest rate swaps, net of tax		3,045	0	0	0	0	3,045
Stock compensation		1,673	0	1,673	0	0	0
Balance, Ending at Jun. 30, 2018		1,501,156	145	376,740	(445,118)	1,841,489	(272,100)
Balance, Beginning at Dec. 29, 2018		1,665,203	145	377,419	(445,118)	2,009,233	(276,476)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings		161,223	0	0	0	161,223	0
Cumulative Effect on Retained Earnings, Net of Tax | Accounting Standards Update 2018-02						(1,100)
Cumulative Effect on Retained Earnings, Net of Tax | Accounting Standards Update 2017-12	[4]	0	0	0	0	(11)	11
Currency translation adjustment		(1,762)	0	0	0	0	(1,762)
Change in unrecognized pension benefit costs, net of tax		(9)	0	0	0	0	(9)
Unrealized gain on interest rate swaps, net of tax		(23,491)
Unrealized gain on interest rate swaps, net of tax | Accounting Standards Update 2017-12		(23,502)	0	0	0	0	(23,502)
Stock compensation		1,334	0	1,334	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		(6,086)	0	0	(6,086)	0	0
Balance, Ending at Jun. 29, 2019		1,798,251	145	380,603	(451,204)	2,170,445	(301,738)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive income (loss), adopt of new accounting pronouncement								$ (500)
Other comprehensive income (loss), adopt of new accounting pronouncement | Accounting Standards Update 2018-02									$ 1,600
Balance, Beginning at Mar. 30, 2019		1,726,059	145	378,488	(450,386)	2,078,235	(280,423)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings		92,210	0	0	0	92,210	0
Currency translation adjustment		(12,445)	0	0	0	0	(12,445)
Change in unrecognized pension benefit costs, net of tax		5,254	0	0	0	0	5,254
Unrealized gain on interest rate swaps, net of tax		(14,124)	0	0	0	0	(14,124)
Stock compensation		265	0	265	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		(818)	0	0	(818)	0	0
Balance, Ending at Jun. 29, 2019		$ 1,798,251	$ 145	$ 380,603	$ (451,204)	$ 2,170,445	$ (301,738)

[1] (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] (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 2018-02, "Income Statement-Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income". This guidance allowed for 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] (1) 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.