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Plans Fair Value of Plan Assets by Asset Class (Detail) - USD ($) $ in Thousands		Jan. 02, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 28, 2019	Dec. 29, 2018
Pension plans
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets		$ 34,750	$ 34,750	$ 360,675	$ 360,675	$ 335,540
Short Term Investments And Cash
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets			546	107,010
Common Stocks | International Common Stocks
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets			5,223	6,844
Common Stocks | U.S. Common Stocks
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets			8,587	11,990
Fixed Income Securities | US Treasury Securities
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets			14,577	14,911
Fixed Income Securities | US Government Agencies Debt Securities
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets				3,806
Fixed Income Securities | Domestic Corporate Debt Securities
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets			5,877	150,840
Fixed Income Securities | International Corporate Bonds
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets				63,050
Pending Transactions
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets	[1]		(35)	(13)
Accrued (Expenses) Income
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets	[1]		(25)	2,289
Other Assets And Liabilities
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets and (liabilities)	[1]			(52)
Level 1 | Pension plans
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets			34,810	136,957
Level 1 | Short Term Investments And Cash
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets			546	103,212
Level 1 | Common Stocks | International Common Stocks
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets			5,223	6,844
Level 1 | Common Stocks | U.S. Common Stocks
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets			8,587	11,990
Level 1 | Fixed Income Securities | US Treasury Securities
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets			14,577	14,911
Level 1 | Fixed Income Securities | Domestic Corporate Debt Securities
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets			$ 5,877
Level 2 | Pension plans
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets				221,494
Level 2 | Short Term Investments And Cash
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets				3,798
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				3,806
Level 2 | Fixed Income Securities | Domestic Corporate Debt Securities
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets				150,840
Level 2 | Fixed Income Securities | International Corporate Bonds
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets				$ 63,050
[1] This class includes accrued interest, dividends, and amounts receivable from asset sales and amounts payable for asset purchases.

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Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

+ References

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