Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Oct. 10, 2015	Oct. 04, 2014	Oct. 10, 2015	Oct. 04, 2014
Statement Of Income And Comprehensive Income [Abstract]
Net income		$ 43,796	$ 44,599	$ 156,945	$ 147,729
Pension and postretirement plans:
Amortization of prior service credit included in net income		(67)	(66)	(223)	(222)
Amortization of actuarial loss included in net income		624	191	2,080	637
Pension and postretirement plans, net of tax		557	125	1,857	415
Derivative instruments:
Net change in fair value of derivatives	[1]	(2,652)	(9,128)	(1,262)	(10,028)
Loss reclassified to net income		1,096	(1,145)	3,934	2,369
Derivative instruments, net of tax		(1,556)	(10,273)	2,672	(7,659)
Other comprehensive income (loss), net of tax		(999)	(10,148)	4,529	(7,244)
Comprehensive income		$ 42,797	$ 34,451	$ 161,474	$ 140,485

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