Plans Fair Value of Plan Assets by Asset Class (Detail) - USD ($) $ in Thousands		Dec. 31, 2017		Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016
Pension plans
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets		$ 340,854		$ 340,854	$ 335,663	$ 370,497
Short Term Investments And Cash
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets		19,771			4,712
Equity Securities | Domestic Equity Funds
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets	[1]	19,879			47,916
Equity Securities | Us Companies
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets		65,414			88,427
Equity Securities | International Companies
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets		665			1,427
Equity Securities | International Equity Funds
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets	[2]	22,178			22,914
Fixed Income Securities | US Treasury Securities
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets		6,538			8,796
Fixed Income Securities | US Government Agencies Debt Securities
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets		10,531			5,909
Fixed Income Securities | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets		3,004			5,512
Fixed Income Securities | Domestic Corporate Debt Securities
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets		9,993			10,539
Pending Transactions
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets		62,000	[3]		5,000
Other Assets And Liabilities
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets and (liabilities)	[3]	(133)			70
Accrued (Expenses) Income
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets	[3]	(79)			(97)
Level 1 | Pension plans
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets		108,136			160,684
Level 1 | Equity Securities | Domestic Equity Funds
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets	[1]	19,879			47,916
Level 1 | Equity Securities | Us Companies
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets		65,414			88,427
Level 1 | Equity Securities | International Companies
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets		665			1,427
Level 1 | Equity Securities | International Equity Funds
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets	[2]	22,178			22,914
Level 2 | Pension plans
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets		49,837			35,468
Level 2 | Short Term Investments And Cash
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets		19,771			4,712
Level 2 | Fixed Income Securities | US Treasury Securities
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets		6,538			8,796
Level 2 | Fixed Income Securities | US Government Agencies Debt Securities
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets		10,531			5,909
Level 2 | Fixed Income Securities | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets		3,004			5,512
Level 2 | Fixed Income Securities | Domestic Corporate Debt Securities
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets		9,993			10,539
Other Investments Measured at Net Asset Value | International Equity Funds
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets	[2],[4]	22,878			24,987
Other Investments Measured at Net Asset Value | Hedge Funds, Equity
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets	[4],[5]	35,054			32,095
Other Investments Measured at Net Asset Value | Absolute Return Funds
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets	[4],[6]	52,704			50,036
Other Investments Measured at Net Asset Value | Real Estate Funds
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets	[7],[8]				17,296
Other Investments Measured at Contract Value | Guaranteed Insurance Contracts
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets	[7],[9]	$ 10,457			$ 10,124

[1] This class includes funds with the principal strategy to invest primarily in long positions in domestic equity securities.

[2] This class includes funds with the principal strategy to invest primarily in long positions in international equity securities. This asset was reclassified from a Level 2 to a Level 1 type for all periods. This asset was incorrectly presented as a Level 2.

[3] This class includes accrued interest, dividends, and amounts receivable from asset sales and amounts payable for asset purchases.

[4] Certain investments that are measured at fair value using the net asset value per share (or its equivalent) practical expedient have not been classified in the fair value hierarchy.

[5] This class invests primarily in hedged equity funds.

[6] This class invests primarily in absolute return strategy funds and are reported at NAV.

[7] Certain investments, which are fully-benefit responsive investment contracts, are measured at contract value and have not been classified in the fair value hierarchy.

[8] This class includes funds that invest primarily in U.S. commercial real estate.

[9] This class invests primarily guaranteed insurance contracts through various U.S. insurance companies.