Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Oct. 07, 2017	Oct. 08, 2016	Oct. 07, 2017	Oct. 08, 2016
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)		$ (33,571)	$ 40,216	$ 71,587	$ 150,734
Pension and postretirement plans:
Settlement loss		1,863	1,127	1,863	3,981
Net loss for the period		(2,707)	(1,714)	(2,707)	(38,121)
Amortization of prior service cost included in net income		21	29	79	79
Amortization of actuarial loss included in net income		769	1,273	2,712	2,939
Pension and postretirement plans, net of tax		(54)	715	1,947	(31,122)
Derivative instruments:
Net change in fair value of derivatives	[1]	(9,652)	3,433	(5,932)	2,496
Loss reclassified to net income		372	742	1,166	2,688
Derivative instruments, net of tax		(9,280)	4,175	(4,766)	5,184
Other comprehensive income (loss), net of tax		(9,334)	4,890	(2,819)	(25,938)
Comprehensive income (loss)		$ (42,905)	$ 45,106	$ 68,768	$ 124,796

[1] Amounts in parentheses indicate debits to determine net income (loss).