Components of Net Periodic Benefit (Income) Cost (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 16, 2016	Jul. 18, 2015	Jul. 16, 2016	Jul. 18, 2015
Defined Benefit Plan Disclosure [Line Items]
Settlement loss	$ 4,641		$ 4,641
Pension plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	192	$ 201	447	$ 470
Interest cost	2,884	4,155	7,417	9,694
Expected return on plan assets	(5,457)	(6,840)	(14,069)	(15,961)
Settlement loss	4,641		4,641
Amortization of prior service cost (credit)	76		195
Amortization of net (gain) loss	1,155	1,149	2,953	2,681
Total net periodic benefit (income) cost	3,491	(1,335)	1,584	(3,116)
Post-retirement Benefit Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	93	93	216	215
Interest cost	71	82	166	194
Amortization of prior service cost (credit)	(49)	(108)	(114)	(252)
Amortization of net (gain) loss	(105)	(135)	(245)	(315)
Total net periodic benefit (income) cost	$ 10	$ (68)	$ 23	$ (158)