CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY Statement - USD ($) $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Common Stock	Common Stock Cumulative Effect, Period of Adoption, Adjustment	Paid-in Capital	Paid-in Capital Cumulative Effect, Period of Adoption, Adjustment	Treasury Stock	Treasury Stock Cumulative Effect, Period of Adoption, Adjustment	Retained Earnings	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment	[1]	Accumulated Other Comprehensive Income (loss)	Accumulated Other Comprehensive Income (loss) Cumulative Effect, Period of Adoption, Adjustment	[1]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adoption of ASU 2017-12 (1)		$ 100
Adoption of ASU 2017-12 (1) | Accounting Standards Update 2017-12		$ 0		$ 0		$ 0		$ 0		$ (11)			$ 11
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
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)
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, Tax	(71)
Unrealized gain on interest rate swaps, net of tax	(23,491)		0		0		0		0
Unrealized gain on interest rate swaps, net of tax | Accounting Standards Update 2017-12	(23,502)											(23,502)
Unrealized (loss) gain on interest rate swap, tax	(8,023)
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)
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
Change in unrecognized pension benefit costs, net of tax | Accounting Standards Update 2017-12	(5,254)											(5,254)
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, Tax	1,081
Unrealized gain on interest rate swaps, net of tax	(14,124)		0		0		0		0			(14,124)
Unrealized (loss) gain on interest rate swap, tax	(4,846)
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)
Balance, Beginning at Dec. 28, 2019	1,946,814		145		387,402		(451,262)		2,361,462			(350,933)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	94,941		0		0		0		94,941			0
Currency translation adjustment	(29,064)		0		0		0		0			(29,064)
Change in unrecognized pension benefit costs, net of tax	12,317		0		0		0		0			12,317
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, Tax	2,591
Unrealized gain on interest rate swaps, net of tax	(27,880)		0		0		0		0			(27,880)
Unrealized (loss) gain on interest rate swap, tax	(10,263)
Stock compensation	9,122		0		9,122		0		0			0
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs	10,116		0		10,116		0		0			0
Purchase of treasury stock	(76,849)		0		0		(76,849)		0			0
Balance, Ending at Jun. 27, 2020	1,939,517		145		406,640		(528,111)		2,456,403			(395,560)
Balance, Beginning at Mar. 28, 2020	1,894,706		145		395,442		(525,862)		2,435,241			(410,260)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	21,162		0		0		0		21,162			0
Currency translation adjustment	19,852		0		0		0		0			19,852
Change in unrecognized pension benefit costs, net of tax	(2,491)		0		0		0		0			(2,491)
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, Tax	(532)
Unrealized gain on interest rate swaps, net of tax	(2,661)		0		0		0		0			(2,661)
Unrealized (loss) gain on interest rate swap, tax	(964)
Stock compensation	4,963		0		4,963		0		0			0
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs	6,235		0		6,235		0		0			0
Purchase of treasury stock	(2,249)		0		0		(2,249)		0			0
Balance, Ending at Jun. 27, 2020	$ 1,939,517		$ 145		$ 406,640		$ (528,111)		$ 2,456,403			$ (395,560)

[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.