Condensed Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Capital in Excess of Par Value	Retained Earnings	Accumulated Other Comprehensive Loss	Treasury Stock
Balances at Dec. 29, 2018	$ 1,258,267	$ 199	$ 653,477	$ 945,410	$ (109,171)	$ (231,648)
Balances (in shares) at Dec. 29, 2018		228,729,585
Balances, treasury shares at Dec. 29, 2018						(17,834,378)
Net (loss) income	65,866			65,866
Derivative instruments, net of tax	(11,771)				(11,771)
Pension and postretirement plans, net of tax	1,648				1,648
Cumulative effect of change in accounting principle	(2,915)			(2,915)
Amortization of share-based compensation awards	3,179		3,179
Issuance of deferred compensation			(1)			$ 1
Issuance of deferred compensation (in shares)						113
Time-based restricted stock units issued (Note 16)			(11,498)			$ 11,498
Time-based restricted stock units issued (in shares)						885,123
Issuance of deferred stock awards			(67)			$ 67
Issuance of deferred stock awards (in shares)						15,822
Stock repurchases	(7,054)					$ (7,054)
Stock repurchases (in shares)						(336,088)
Dividends paid on vested share-based payment awards	(1,233)			(1,233)
Dividends paid	(38,061)			(38,061)
Balances at Apr. 20, 2019	1,267,926	$ 199	645,090	969,067	(119,294)	$ (227,136)
Balances (in shares) at Apr. 20, 2019		228,729,585
Balances, treasury shares at Apr. 20, 2019						(17,269,408)
Balances at Dec. 28, 2019	$ 1,263,430	$ 199	648,492	947,046	(106,020)	$ (226,287)
Balances (in shares) at Dec. 28, 2019		228,729,585
Balances, treasury shares at Dec. 28, 2019	(17,215,514)					(17,215,514)
Net (loss) income	$ (5,772)			(5,772)
Derivative instruments, net of tax	(3,438)				(3,438)
Pension and postretirement plans, net of tax	103,566				103,566
Amortization of share-based compensation awards	3,894		3,894
Issuance of deferred compensation			(1)			$ 1
Issuance of deferred compensation (in shares)						113
Time-based restricted stock units issued (Note 16)			(975)			$ 975
Time-based restricted stock units issued (in shares)						74,204
Issuance of deferred stock awards			(152)			$ 152
Issuance of deferred stock awards (in shares)						11,594
Stock repurchases	(783)					$ (783)
Stock repurchases (in shares)						(37,433)
Dividends paid on vested share-based payment awards	(87)			(87)
Dividends paid	(40,199)			(40,199)
Balances at Apr. 18, 2020	$ 1,320,611	$ 199	$ 651,258	$ 900,988	$ (5,892)	$ (225,942)
Balances (in shares) at Apr. 18, 2020		228,729,585
Balances, treasury shares at Apr. 18, 2020	(17,167,036)					(17,167,036)