Benefit Plans - Reconciliation of Beginning and Ending Balances of Accrued Liability (Detail) - USD ($) $ in Thousands	Jan. 03, 2016	Dec. 28, 2014
Defined Benefit Plan Disclosure [Line Items]
Noncurrent liabilities	$ (115,197)	$ (134,100)
Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Current liabilities	(3,401)	(2,998)
Noncurrent liabilities	(66,960)	(67,123)
Accrued liability at end of year	$ (70,361)	$ (70,121)