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Shareholders' Equity (Narrative) (Details) | 3 Months Ended | 12 Months Ended | 126 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jan. 02, 2016 USD ($) $ / shares shares | Jan. 02, 2016 USD ($) $ / shares shares | Jan. 03, 2015 USD ($) $ / shares shares | Dec. 28, 2013 USD ($) $ / shares shares | Dec. 29, 2012 hours | Jun. 12, 2009 shares | May. 31, 2007 shares | Jan. 01, 2007 shares
Schedule of Shareholders' Equity [Line Items] |  |  |  |  |  |  |  |
Treasury stock, shares acquired |  | 550,000 | 1,665,850 | 740,000 |  |  |  |
Director Plan [Member] |  |  |  |  |  |  |  |
Schedule of Shareholders' Equity [Line Items] |  |  |  |  |  |  |  |
Shares available for future issuance |  |  |  |  |  |  | 300,000 |
Corporation common stock, issued |  | 20,146 | 27,272 | 26,520 |  |  |  |
Purchase Plan [Member] |  |  |  |  |  |  |  |
Schedule of Shareholders' Equity [Line Items] |  |  |  |  |  |  |  |
Shares available for future issuance |  |  |  |  |  | 1,000,000 |  | 800,000
Rights to purchase stock, minimum working hours per week | hours |  |  |  |  | 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% | 85.00% |  |  |  |  |  |
Maximum amount fair value for purchase of common stock | $ |  | $ 25,000 |  |  |  |  |  |
Shares of common stock issued |  | 73,874 | 84,065 | 86,291 |  |  |  |
Common stock issued at average price | $ / shares | $ 32.18 | $ 32.18 | $ 27.92 | $ 25.63 |  |  |  |
Shares available for future issuance | 373,268 | 373,268 |  |  |  |  |  |
Derivative Financial Instruments [Member] |  |  |  |  |  |  |  |
Schedule of Shareholders' Equity [Line Items] |  |  |  |  |  |  |  |
Amounts reclassified from accumulated other comprehensive income, net of tax | $ | $ 1,252,000 | $ 1,627,000 | $ 114,000 | $ (154,000) |  |  |  |
Derivative Financial Instruments [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |  |  |  |  |
Schedule of Shareholders' Equity [Line Items] |  |  |  |  |  |  |  |
Amount of ineffective hedge | $ |  | $ (1,627,000) | $ (114,000) |  |  |  |  |
Officer [Member] |  |  |  |  |  |  |  |
Schedule of Shareholders' Equity [Line Items] |  |  |  |  |  |  |  |
Change in control percentage |  | 20.00% |  |  |  |  |  |
Percent of board members |  | 0.3333 |  |  |  |  |  |
Number of times annual salary |  | 200.00% |  |  |  |  |  |
Term of employment agreement |  | 2 years |  |  |  |  |  |
Average number of years for bonus payment |  | 200.00% |  |  |  |  |  |
Corporation's Chairman, President and CEO [Member] |  |  |  |  |  |  |  |
Schedule of Shareholders' Equity [Line Items] |  |  |  |  |  |  |  |
Number of times annual salary |  | 300.00% |  |  |  |  |  |

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