Benefits Expected to be Paid from Plans Assets (Detail) - USD ($) $ in Thousands		12 Months Ended
		Jan. 02, 2016	Jan. 03, 2015	Dec. 28, 2013
Pension plans
Schedule of Pension and Other Postretirement Benefits Expected Benefit Payments [Line Items]
Benefits paid		$ 25,014	$ 27,046	$ 25,494
2016		42,450
2017		37,428
2018		35,419
2019		34,205
2020		31,710
2021 – 2025		137,041
Pension plans | Includes Plan No 1 and No 2 One Time Voluntary Lump Sum Offer
Schedule of Pension and Other Postretirement Benefits Expected Benefit Payments [Line Items]
Benefits paid	[1]	25,014	75,459
Postretirement Benefit Plans
Schedule of Pension and Other Postretirement Benefits Expected Benefit Payments [Line Items]
Benefits paid		898	670
Postretirement Benefit Plans | Employer Gross Contribution
Schedule of Pension and Other Postretirement Benefits Expected Benefit Payments [Line Items]
Benefits paid		674	$ 478	952
2016		730
2017		903
2018		968
2019		959
2020		890
2021 – 2025		$ 4,366
Postretirement Benefit Plans | MMA Subsidy (Income)
Schedule of Pension and Other Postretirement Benefits Expected Benefit Payments [Line Items]
Federal subsidy on benefits paid				$ (52)

[1] Includes $48.4 million and $2.0 million from Plan No. 1 and Plan No. 2, respectively, associated with the one-time voluntary lump sum offer discussed above.