The minimum lease payment of commitment during the period.

No definition available.

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- Definition

Represents the reduction in interest expense due to change in fair value of the interest rate swap.

+ References

No definition available.

+ Details

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- Definition

The reference rate for the variable rate of the derivative.

+ References

No definition available.

+ Details

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- Definition

The amount of expected reduction in capital lease obligation within the next 12 months.

+ References

No definition available.

+ Details

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- Definition

The term of licensing agreement during the period.

+ References

No definition available.

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Balance Type:	na
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- Definition

Amount before accumulated depreciation of leased physical assets used in the normal conduct of business to produce goods and services.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=84164758&loc=d3e45014-112735

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Balance Type:	debit
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- Definition

The total gross amount less the charge for the use of the long-lived depreciable assets subject to a lease meeting the criteria for capitalization.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=84164817&loc=d3e45280-112737

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
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Balance Type:	credit
Period Type:	instant

- Definition

Description of any adjustments made to the stated rate to determine the effective rate.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
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Data Type:	xbrli:stringItemType
Balance Type:	na
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- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

+ Details

Name:	us-gaap_DebtInstrumentInterestRateEffectivePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of the hedged item as of the balance sheet date related to the derivative. For example, the hedged balance on a debt instrument.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

- Definition

The percentage points added to the reference rate to compute the variable rate on the interest rate derivative.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Fixed interest rate related to the interest rate derivative.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeFixedInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Nominal or face amount used to calculate payments on the derivative liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
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-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5579245-113959

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Data Type:	xbrli:monetaryItemType
Balance Type:	na
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- Definition

Variable interest rate in effect as of the balance sheet date related to the interest rate derivative.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Fair value as of the balance sheet date of all derivative liabilities designated as interest rate fair value hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The cash outflow for the obligation for a lease meeting the criteria for capitalization (with maturities exceeding one year or beyond the operating cycle of the entity, if longer).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash outflow for a borrowing supported by a written promise to pay an obligation.

+ References

+ Details

Name:	us-gaap_RepaymentsOfNotesPayable
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_BuildingAndBuildingImprovementsMember
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Data Type:	na
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Period Type:

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Data Type:	na
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- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_UnsecuredDebtMember
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Period Type:

- Details

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Long-Term Debt and Capital Lease Obligations (Details Textual) - USD ($)	3 Months Ended
	Mar. 29, 2018	Mar. 30, 2017	Mar. 01, 2018	Jan. 31, 2018	Dec. 28, 2017
Derivative, Amount of Hedged Item			$ 50,000,000	$ 25,000,000
Derivative Liability, Notional Amount	$ 25,000,000
Term Of Licensing Agreement	10 years
Commitment Minimum Lease Payments	$ 6,163,000
Repayments of Long-term Capital Lease Obligations	432,000	$ 255,000
Obligation To Be Reduced In Next 12 Months	5,484,000
Interest Rate Fair Value Hedge Liability at Fair Value	197,000
Digital Systems [Member]
Capital Leases, Balance Sheet, Assets by Major Class, Net	45,510,000				$ 45,510,000
Finite-Lived Intangible Assets, Accumulated Amortization	36,015,000				34,471,000
Furniture and Fixtures [Member]
Capital Leases, Balance Sheet, Assets by Major Class, Net	316,000				255,000
Capital Leased Assets, Gross	1,712,000				1,712,000
Building and Building Improvements [Member]
Capital Leases, Balance Sheet, Assets by Major Class, Net	2,706,000				2,300,000
Capital Leased Assets, Gross	25,648,000				$ 25,648,000
Furniture and Fixtures AND Building and Building Improvements [Member]
Repayments of Long-term Capital Lease Obligations	$ 808,000
Unsecured Senior Notes [Member]
Debt Instrument, Face Amount		$ 50,000,000
Debt Instrument, Interest Rate, Stated Percentage		4.32%
Interest Rate Swap [Member]
Derivative, Fixed Interest Rate			2.559%	0.96%
Derivative, Variable Interest Rate	1.938%
Decrease In Interest Expense	$ 13,000
Mortgage Notes [Member]
Debt Instrument, Face Amount		$ 15,000,000
Debt Instrument, Interest Rate, Basis for Effective Rate		2.75
Debt Instrument, Interest Rate, Effective Percentage		3.75%
Repayments of Notes Payable		$ 24,226,000
First Interest Rate Swap [Member]
Derivative, Fixed Interest Rate	2.687%
Derivative, Description of Variable Rate Basis	one-month LIBOR 1.938%
Derivative, Basis Spread on Variable Rate	1.938%
Second Interest Rate Swap [Member]
Derivative, Description of Variable Rate Basis	one-month LIBOR 1.938%
Derivative, Basis Spread on Variable Rate	1.938%