Benefits Expected to be Paid from Plans Assets (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2016	Jan. 02, 2016	Jan. 03, 2015
Pension plans
Schedule of Pension and Other Postretirement Benefits Expected Benefit Payments [Line Items]
Benefits paid		$ 25,130	$ 25,014
2017		33,675
2018		32,349
2019		31,157
2020		29,762
2021		28,916
2022 – 2026		128,858
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]			$ 75,459
Pension plans | Includes Plan No 1 and No 2 Single Lump Sum
Schedule of Pension and Other Postretirement Benefits Expected Benefit Payments [Line Items]
Benefits paid	[2]	40,864
Postretirement Benefit Plans
Schedule of Pension and Other Postretirement Benefits Expected Benefit Payments [Line Items]
Benefits paid		1,125	898
Postretirement Benefit Plans | Employer Gross Contribution
Schedule of Pension and Other Postretirement Benefits Expected Benefit Payments [Line Items]
Benefits paid		841	$ 674	$ 478
2017		692
2018		745
2019		735
2020		677
2021		661
2022 – 2026		$ 3,291

[1] Includes $48.4 million and $2.0 million from Plan No. 1 and Plan No. 2, respectively paid in December 2014, associated with a one-time voluntary lump sum offer.

[2] Includes $15.7 million and $1.6 million from Plan No. 1 and Plan No. 2, respectively, paid as lump sums. The plans were amended effective January 1, 2016 to allow participants not yet receiving benefit payments to elect to receive their benefit as a single lump sum.