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 Income (Loss)	Treasury Stock
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)
Net income (loss)	(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)
Balances at Jan. 02, 2021	$ 1,372,994	$ 199	659,682	932,094	6,424	$ (225,405)
Balances (in shares) at Jan. 02, 2021		228,729,585
Balances, treasury shares at Jan. 02, 2021	(17,126,261)					(17,126,261)
Net income (loss)	$ 71,655			71,655
Derivative instruments, net of tax	4,965				4,965
Pension and postretirement plans, net of tax	136				136
Amortization of share-based compensation awards	7,182		7,182
Issuance of deferred compensation			(7)			$ 7
Issuance of deferred compensation (in shares)						546
Time-based restricted stock units issued (Note 16)			(1,798)			$ 1,798
Time-based restricted stock units issued (in shares)						136,652
Issuance of deferred stock awards			(78)			$ 78
Issuance of deferred stock awards (in shares)						5,931
Stock repurchases	(1,058)					$ (1,058)
Stock repurchases (in shares)						(46,618)
Dividends paid on vested share-based payment awards	(163)			(163)
Dividends paid	(42,340)			(42,340)
Balances at Apr. 24, 2021	$ 1,413,371	$ 199	$ 664,981	$ 961,246	$ 11,525	$ (224,580)
Balances (in shares) at Apr. 24, 2021		228,729,585
Balances, treasury shares at Apr. 24, 2021	(17,029,750)					(17,029,750)