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Income Taxes: (Details) (USD $) | 12 Months Ended
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Jan. 01, 2013 | Jan. 03, 2012 | Dec. 28, 2010
Income Taxes: |  |  |
Income before income taxes | $ 133,974,000 | $ 129,143,000 | $ 111,089,000
Current: |  |  |
Federal | 39,792,000 | 17,093,000 | 26,580,000
State | 8,517,000 | 8,423,000 | 6,883,000
Total current | 48,309,000 | 25,516,000 | 33,463,000
Deferred: |  |  |
Federal | (11,055,000) | 9,284,000 | (4,024,000)
State | (1,703,000) | (1,377,000) | (63,000)
Total deferred | (12,758,000) | 7,907,000 | (4,087,000)
Total provision | 35,551,000 | 33,423,000 | 29,376,000
Income Taxes Rate Reconciliation |  |  |
Tax at U.S. federal statutory rate (as a percent) | 35.00% | 35.00% | 35.00%
State and district income taxes, net of federal income tax benefit (as a percent) | 3.30% | 3.60% | 4.10%
FICA tip credit (as a percent) | (7.70%) | (6.90%) | (7.60%)
HIRE Act retention tax credit (as a percent) | 0.00% | (1.40%) |
Other credits and incentives (as a percent) | (0.60%) | (0.80%) | (0.60%)
Change in uncertain tax positions (as a percent) | 0.00% | (1.30%) | (0.70%)
Manufacturing deduction (as a percent) | (2.80%) | (2.70%) | (3.10%)
Deferred compensation (as a percent) | (0.70%) | 0.20% | (0.60%)
Other (as a percent) |  | 0.20% | (0.10%)
Effective tax rate (as a percent) | 26.50% | 25.90% | 26.40%
Deferred tax assets: |  |  |
Employee benefits | 20,135,000 | 15,927,000 |
Insurance reserves | 15,284,000 | 13,099,000 |
Accrued rent | 23,945,000 | 21,257,000 |
Stock-based compensation | 18,908,000 | 20,800,000 |
Deferred income | 7,060,000 | 5,690,000 |
Tax credit carryforwards | 1,751,000 | 1,918,000 |
Other | 853,000 | 1,416,000 |
Subtotal | 87,936,000 | 80,107,000 |
Less: Valuation allowance | (258,000) |  |
Total | 87,678,000 | 80,107,000 |
Deferred tax liabilities: |  |  |
Property and equipment | (146,763,000) | (153,299,000) |
Inventory | (9,160,000) | (8,847,000) |
Prepaid expenses | (8,350,000) | (7,314,000) |
Total | (164,273,000) | (169,460,000) |
Net deferred tax liability | (76,595,000) | (89,353,000) |
Reported in consolidated balance sheets as: |  |  |
Deferred income taxes - current asset | 15,257,000 | 14,574,000 |
Deferred income taxes - noncurrent liability | (91,852,000) | (103,927,000) |
Net deferred tax liability | (76,595,000) | (89,353,000) |
Reconciliation of beginning and ending amount of unrecognized tax benefits |  |  |
Balance at beginning of year | 590,000 | 2,135,000 | 6,460,000
Additions based on tax positions taken during a prior period | 0 |  |
Reductions based on tax positions taken during a prior period |  |  | (3,085,000)
Additions based on tax positions taken during the current period | 230,000 | 199,000 | 163,000
Reductions related to settlements with taxing authorities and lapses of statutes of limitations | (125,000) | (1,744,000) | (1,403,000)
Balance at end of year | 695,000 | 590,000 | 2,135,000
Unrecognized tax benefits, if recognized, would unfavorably affect the annual effective income tax rate | 700,000 |  |
Accrued interest related with uncertain tax positions | 100,000 | 100,000 |
Decrease in unrecognized tax benefits during the next twelve months based on the lapses of statutes of limitations for certain jurisdictions | (100,000) |  |
Compensation expense disallowed as per notice issued by IRS | 5,100,000 |  |
State |  |  |
Tax credit carryforwards |  |  |
Tax credit carryforwards | $ 2,700,000 | $ 3,000,000 |

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- Definition The sum of the differences between the effective income tax rate and domestic federal statutory income tax rate that can be explained by all tax credits generated or utilized under enacted tax laws during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=6889476&loc=d3e330036-122817 + Details
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- Definition The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 45 -Subparagraph a, b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 + Details
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- Definition The amount of the unrecognized tax benefit of a position taken for which it is reasonably possible that the total amount thereof will significantly increase or decrease within twelve months of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 48 -Paragraph 21 -Subparagraph d -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 17 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Carryforwards -URI http://asc.fasb.org/extlink&oid=6506874 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 48 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The gross amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Unrecognized Tax Benefit -URI http://asc.fasb.org/extlink&oid=6527854 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 48 -Paragraph 21 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The gross amount of increases in unrecognized tax benefits resulting from tax positions taken in prior period tax returns, excluding amounts pertaining to examined tax returns. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 48 -Paragraph 21 -Subparagraph a(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition This element represents the amount of interest expense accrued as of the date of the statement of financial position for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 48 -Paragraph 21 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 48 -Paragraph 15 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 48 -Paragraph 21 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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