Plans Fair Value of Plan Assets by Asset Class (Detail) - USD ($) $ in Thousands		Dec. 31, 2016	Jan. 02, 2016	Dec. 31, 2015	Jan. 03, 2015
Pension plans
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets		$ 335,663	$ 370,497	$ 370,497	$ 378,194
Short Term Investments And Cash
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets		4,712		5,200
Equity Securities | Domestic Equity Funds
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets	[1]	47,916		54,949
Equity Securities | Us Companies
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets		88,427		93,600
Equity Securities | International Companies
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets		1,427		1,957
Equity Securities | International Equity Funds
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets	[2]	22,914		26,565
Fixed Income Securities | US Treasury Securities
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets		8,796		5,257
Fixed Income Securities | US Government Agencies Debt Securities
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets		5,909		3,215
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		5,512		7,201
Fixed Income Securities | Domestic Corporate Debt Securities
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets		10,539		21,202
Absolute Return Funds
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets	[3]	25,737		28,964
Pending Sale Orders
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets	[4]	5,000
Other Assets And Liabilities
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets and (liabilities)	[4]	70		(376)
Accrued (Expenses) Income
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets	[4]	(97)		183
Level 1 | Pension plans
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets		137,770		150,506
Level 1 | Equity Securities | Domestic Equity Funds
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets	[1]	47,916		54,949
Level 1 | Equity Securities | Us Companies
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets		88,427		93,600
Level 1 | Equity Securities | International Companies
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets		1,427		1,957
Level 2 | Pension plans
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets		58,382		68,640
Level 2 | Short Term Investments And Cash
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets		4,712		5,200
Level 2 | Equity Securities | International Equity Funds
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets	[2]	22,914		26,565
Level 2 | Fixed Income Securities | US Treasury Securities
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets		8,796		5,257
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		5,909		3,215
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		5,512		7,201
Level 2 | Fixed Income Securities | Domestic Corporate Debt Securities
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets		10,539		21,202
Level 3 | Pension plans
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets		25,737		28,964
Level 3 | Absolute Return Funds
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets	[3]	25,737		28,964
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],[5]	24,987		27,406
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	[5],[6]	32,095		40,582
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	[3],[5]	24,299		27,473
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]	17,296		17,335
Other Investments Measured at Contract Value | Guaranteed Insurance Contracts
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets	[8]	$ 10,124		$ 9,784

[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.

[3] This class invests primarily in absolute return strategy funds.

[4] This class includes accrued interest, dividends, and amounts receivable from asset sales and amounts payable for asset purchases. This class also includes pending sale requests.

[5] 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.

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

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

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