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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
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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.

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