Condensed Consolidated Statement 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 Jan. 02, 2016					$ (96,800)
Net income	$ 110,518
Derivative instruments, net of tax	1,009
Pension and postretirement plans, net of tax	(31,837)
Balances at Jul. 16, 2016					(127,628)
Balances at Jan. 02, 2016					(96,800)
Balances at Dec. 31, 2016	$ 1,210,080	$ 199	$ 644,456	$ 910,520	(83,283)	$ (261,812)
Balances (in shares) at Dec. 31, 2016		228,729,585
Balances, treasury shares at Dec. 31, 2016	(20,306,784)					(20,306,784)
Net income	$ 105,158			105,158
Derivative instruments, net of tax	4,514				4,514
Pension and postretirement plans, net of tax	2,001				2,001
Exercise of stock options	6,416		(1,155)			$ 7,571
Exercise of stock options (in shares)						586,980
Amortization of share-based compensation awards	8,690		8,690
Issuance of deferred compensation			(35)			$ 35
Issuance of deferred compensation (in shares)						2,675
Performance-contingent restricted stock awards issued (Note 13)			(4,240)			$ 4,240
Performance-contingent restricted stock awards issued (in shares)						328,947
Issuance of deferred stock awards			(1,789)			$ 1,789
Issuance of deferred stock awards (in shares)						138,354
Stock repurchases	(2,671)					$ (2,671)
Stock repurchases (in shares)						(140,135)
Dividends paid on vested share-based payment awards	(553)			(553)
Dividends paid — $.3300 per common share	(69,048)			(69,048)
Balances at Jul. 15, 2017	$ 1,264,587	$ 199	$ 645,927	$ 946,077	$ (76,768)	$ (250,848)
Balances (in shares) at Jul. 15, 2017		228,729,585
Balances, treasury shares at Jul. 15, 2017	(19,389,963)					(19,389,963)