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Plans Fair Value of Plan Assets by Asset Class (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 28, 2019 | Dec. 31, 2018 | Dec. 29, 2018 | Dec. 30, 2017
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Pension plans |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | $ 360,675 | $ 360,675 | $ 335,540 | $ 335,540 | $ 340,854
Short Term Investments And Cash |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 107,010 |  | 34,118 |  |
Common Stocks | International Common Stocks |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 6,844 |  |  |  |
Common Stocks | U.S. Common Stocks |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 11,990 |  |  |  |
Fixed Income Securities | US Treasury Securities |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 14,911 |  | 4,581 |  |
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 |  | 3,561 |  |
Fixed Income Securities | Domestic Corporate Debt Securities |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 150,840 |  | 166,670 |  |
Fixed Income Securities | International Corporate Bonds |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 63,050 |  | 53,709 |  |
Pending Transactions |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets | [1] | (13) |  | 59,452 |  |
Other Assets And Liabilities |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets and (liabilities) | [1] | (52) |  | 2,636 |  |
Accrued (Expenses) Income |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets | [1] | 2,289 |  | (40) |  |
Level 1 | Pension plans |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 136,957 |  |  |  |
Level 1 | Short Term Investments And Cash |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 103,212 |  |  |  |
Level 1 | Common Stocks | International Common Stocks |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 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 |  | 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 |  | 14,911 |  |  |  |
Level 2 | Pension plans |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 221,494 |  | 262,639 |  |
Level 2 | Short Term Investments And Cash |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 3,798 |  | 34,118 |  |
Level 2 | Fixed Income Securities | US Treasury Securities |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets |  |  |  | 4,581 |  |
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 |  | 3,561 |  |
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 |  | 166,670 |  |
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 |  | 53,709 |  |
Other Investments Measured at Contract Value | Guaranteed Insurance Contracts |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets | [2] |  |  | $ 10,853 |  |
[1] | This class includes accrued interest, dividends, and amounts receivable from asset sales and amounts payable for asset purchases.
[2] | This class invests primarily guaranteed insurance contracts through various U.S. insurance companies. This fully-benefit responsive investment contract is measured at contract value and is not classified in the fair value hierarchy.

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