Long-term Debt and Obligations Under Capital Leases (Details) (USD $)	9 Months Ended
Sep. 27, 2011 Year	Dec. 28, 2010
Long-term Debt and Obligations Under Capital Leases
Long-term debt and obligations under capital leases	$ 51,977,000	$ 52,180,000
Less current maturities	296,000	274,000
Long-term debt and obligations under capital leases, excluding current maturities	51,681,000	51,906,000
Installment loans, due 2011 - 2020
Long-term Debt and Obligations Under Capital Leases
Long-term debt	1,727,000	1,865,000
Weighted-average interest rate (as a percent)	10.57%	10.58%
Obligations under capital leases
Long-term Debt and Obligations Under Capital Leases
Long-term debt	250,000	315,000
Revolver
Long-term Debt and Obligations Under Capital Leases
Long-term debt	50,000,000	50,000,000
Revolving credit facility, maximum borrowing capacity	200,000,000
Revolving credit facility term (in years)	5
Percentage of commitment fee on unused credit facility, low end of range	0.15%
Percentage of commitment fee on unused credit facility, high end of range	0.35%
Weighted-average interest rate (as a percent)	4.09%	3.59%
Revolving credit facility outstanding	50,000,000
Revolving credit facility, remaining borrowing capacity	146,200,000
Letters of credit outstanding	$ 3,800,000
Revolving credit facility, minimum fixed charge coverage ratio	2.00 to 1.00
Debt instrument condition for additional borrowing of secured debt, based on percentage of consolidated tangible net worth (as a percent)	20.00%
Revolving credit facility, maximum leverage ratio	3.00 to 1.00
Revolver \| LIBOR
Long-term Debt and Obligations Under Capital Leases
Interest rate added to base rate (as a percent)	0.50%
Revolver \| Eurodollar
Long-term Debt and Obligations Under Capital Leases
Interest rate added to base rate (as a percent)	1.00%
LIBOR
Long-term Debt and Obligations Under Capital Leases
Interest rate added to base rate, low end of range (as a percent)	0.875%
Interest rate added to base rate, high end of range (as a percent)	1.875%

The high end of the range of percentage points added to the reference rate to compute the variable rate on the debt instrument.

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- Definition

The low end of the range of percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Represents the condition for additional borrowing of secured debt, based on the specified percentage on consolidated tangible net worth.

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- Definition

The maximum consolidated leverage ratio the entity is limited to under the covenant terms of a credit facility.

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The minimum consolidated fixed charge coverage ratio required to be maintained by the entity under the covenant terms of a credit facility.

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- Definition

Represents the term of the line of credit facility.

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- Definition

The high end of the fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

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- Definition

The low end of the fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

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- Definition

Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations.

+ References

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-Publisher FASB

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The percentage points added to the reference rate to compute the variable rate on the debt instrument.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Reflects the calculation as of the balance sheet date of the average interest rate weighted by the amount of debt outstanding by type or by instrument at that time.

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- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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Amount borrowed under the credit facility as of the balance sheet date.

+ References

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-Publisher SEC

-Name Regulation S-X (SX)

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 129

-Paragraph 2, 4

-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.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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- Definition

Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date. May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer, and after deducting unamortized discount or premiums, if any.

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- Definition

Sum of the carrying values as of the balance sheet date of all long-term debt, which is debt initially having maturities due after one year from the balance sheet date or beyond the operating cycle, if longer, but excluding the portions thereof scheduled to be repaid within one year or the normal operating cycle, if longer plus capital lease obligations due to be paid more than one year after the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

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Obligation related to long-term debt (excluding convertible debt) and capital leases, the portion which is due in one year or less in the future.

+ References

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