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Employee Benefit Plans - Additional Information (Details) $ / shares in Units, $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Mar. 09, 2015 shares | Sep. 15, 2014 USD ($) $ / shares shares | Jan. 02, 2016 USD ($) installment $ / shares shares | Jan. 03, 2015 USD ($) $ / shares shares | Dec. 28, 2013 USD ($) $ / shares shares
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Number of shares available for grant | shares |  |  | 655,168 |  |
Tax benefits related to employees' and directors' stock plans |  |  | $ 881 | $ 771 | $ 351
Share price | $ / shares |  |  | $ 40.61 |  |
Cost recognized, defined contribution plan |  |  | $ 2,749 | $ 2,655 | $ 2,607
Chief financial officer |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Compensation expense for arrangement with CFO |  | $ 360 |  |  |
Pension benefits |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Future amortization of gain (loss) |  |  | (561) |  |
Future amortization of prior service cost (credit) |  |  | 146 |  |
Estimated future employer contribution, next year |  |  | $ 1,080 |  |
Debt Securities | Pension benefits |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Maximum weighted-average maturity, debt securities |  |  | 10 years |  |
Average benchmark duration for debt securities |  |  | 5 years |  |
Restricted stock units for non employee directors (RSUs) |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Grants in period | shares |  |  | 5,000 |  |
Restricted stock units for non employee directors change of control |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Grants in period | shares | 10,000 |  | 50,000 |  |
Fair value of RSU's outstanding |  |  | $ 2,279 |  |
Forfeited / expired (in shares) | shares |  |  | 10,000 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number | shares |  |  | 40,000 |  |
Performance shares |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Number of installment vesting periods | installment |  |  | 3 |  |
Compensation cost not yet recognized |  |  | $ 1,241 |  |
Compensation cost not yet recognized, recognition period |  |  | 1 year 4 months 24 days |  |
Time-based restricted stock units |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Compensation cost not yet recognized |  |  | $ 2,475 |  |
Compensation cost not yet recognized, recognition period |  |  | 1 year 9 months 18 days |  |
Restricted stock units and stock option awards | Chief financial officer |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Compensation and options expense for arrangement with CFO |  | $ 428 |  |  |
Restricted stock unit awards |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Grants in period | shares |  |  | 116,000 |  |
Forfeited / expired (in shares) | shares |  |  | 50,000 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number | shares |  |  | 216,000 | 310,000 |
Weighted average grant date fair value, granted (in dollars per share) | $ / shares |  |  | $ 44.75 | $ 38.52 | $ 25.53
Fair value of awards vested in period |  |  | $ 7,502 | $ 6,895 | $ 4,997
Weighted-average grant date fair value | $ / shares |  |  | $ 37.01 | $ 28.06 |
Restricted stock unit awards | Chief financial officer |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Grants in period | shares |  | 12,313 |  |  |
Weighted-average grant date fair value | $ / shares |  | $ 39.94 |  |  |
Stock option awards |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Number of installment vesting periods | installment |  |  | 3 |  |
Compensation cost not yet recognized |  |  | $ 51 |  |
Award vesting period |  |  | 3 years |  |
Weighted-average grant date fair value of options, granted in period | $ / shares |  |  |  |  | $ 11.33
Stock option awards | Chief financial officer |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Grants in period | shares |  | 5,201 |  |  |
Weighted-average grant date fair value of options, granted in period | $ / shares |  | $ 17.96 |  |  |
Employee Stock Purchase Plan Awards |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Discount to market under the ESOP |  |  | 15.00% |  |
Maximum period of restriction on resale under ESOP |  |  | 1 year |  |
Maximum participation based on compensation percentage under ESOP |  |  | 10.00% |  |
Stock issued during period under ESOP | shares |  |  | 13,573 | 12,017 | 16,325
Selling, general and administrative expenses |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Stock-based compensation expense |  |  | $ 5,741 | $ 5,813 | $ 5,216
Selling, general and administrative expenses | Restricted stock unit awards |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Stock-based compensation expense |  |  | 5,185 | 4,904 | 4,102
Selling, general and administrative expenses | Stock option awards |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Stock-based compensation expense |  |  | 420 | 782 | 1,015
Selling, general and administrative expenses | Employee Stock Purchase Plan Awards |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Stock-based compensation expense |  |  | $ 136 | $ 127 | $ 99

X
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- Definition Amount of increase in additional paid in capital (APIC) resulting from a tax benefit associated with share-based compensation plan other than an employee stock ownership plan (ESOP). Includes, but is not limited to, excess tax benefit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 740 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6419406&loc=d3e23524-113945 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 + Details
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- Definition Amount of employer's best estimate of contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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