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Shareholders' Equity (Narrative) (Details) |  | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2002 hour | Jan. 02, 2016 USD ($) $ / shares | Dec. 31, 2016 USD ($) $ / shares shares | Jan. 02, 2016 USD ($) $ / shares shares | Jan. 03, 2015 USD ($) $ / shares shares | Jun. 12, 2009 shares | May 31, 2007 shares | Jan. 01, 2007 shares
Equity [Abstract] |  |  |  |  |  |  |  |
Treasury stock acquired (shares) |  |  | 1,082,938 | 550,000 | 1,665,850 |  |  |
Schedule of Shareholders' Equity [Line Items] |  |  |  |  |  |  |  |
Amounts reclassified from accumulated other comprehensive income, net of tax | $ |  |  | $ (85,638,000) | $ (105,406,000) | $ (61,155,000) |  |  |
Certain officers |  |  |  |  |  |  |  |
Schedule of Shareholders' Equity [Line Items] |  |  |  |  |  |  |  |
Change in control percentage |  |  | 20.00% |  |  |  |  |
Percent of board members |  |  | 0.3333 |  |  |  |  |
Term of employment agreement |  |  | 2 years |  |  |  |  |
Number of times annual salary |  |  | 200.00% |  |  |  |  |
Corporation's Chairman, President and CEO |  |  |  |  |  |  |  |
Schedule of Shareholders' Equity [Line Items] |  |  |  |  |  |  |  |
Number of times annual salary |  |  | 300.00% |  |  |  |  |
Director plan |  |  |  |  |  |  |  |
Schedule of Shareholders' Equity [Line Items] |  |  |  |  |  |  |  |
Available for future issuance (shares) |  |  |  |  |  |  | 300,000 |
Corporation common stock issued (shares) |  |  | 24,352 | 20,146 | 27,272 |  |  |
Purchase Plan |  |  |  |  |  |  |  |
Schedule of Shareholders' Equity [Line Items] |  |  |  |  |  |  |  |
Available for future issuance (shares) |  |  |  |  |  | 1,000,000 |  | 800,000
Rights to purchase stock, minimum working hours per week | hour | 20 |  |  |  |  |  |  |
Rights to purchase stock, minimum working months per year | 5 months |  |  |  |  |  |  |
Price of repurchased stock as percent of closing price on the exercise date |  |  | 85.00% |  |  |  |  |
Maximum amount fair value for purchase of common stock | $ |  |  | $ 25,000 |  |  |  |  |
Common stock issued (shares) |  |  | 75,098 | 73,874 | 84,065 |  |  |
Common stock issued at average price (in dollars per share) | $ / shares |  | $ 32.18 | $ 31.11 | $ 32.18 | $ 27.92 |  |  |
Shares available for future issuance (shares) |  |  | 298,170 |  |  |  |  |
Diesel hedge | Derivative financial instruments | Reclassifications from accumulated other comprehensive income (loss) |  |  |  |  |  |  |  |
Schedule of Shareholders' Equity [Line Items] |  |  |  |  |  |  |  |
Amounts reclassified from accumulated other comprehensive income, net of tax | $ |  | $ 1,300,000 | $ 0 | $ 1,627,000 |  |  |  |

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