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

No definition available.

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	duration

- Definition

The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- 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
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

+ Details

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

- Definition

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

+ 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))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

+ Details

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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

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.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of the required periodic payments applied to principal.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Gross amount of debt extinguished.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Date the credit facility terminates, in CCYY-MM-DD format.

+ References

+ Details

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Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- 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

+ Details

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

- Details

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- Details

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- Details

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- Details

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Debt and Line of Credit (Narrative) (Details) - USD ($)			9 Months Ended
Debt and Line of Credit (Narrative) (Details) - USD ($)	May 17, 2018	Jul. 20, 2017	Oct. 28, 2018	Nov. 01, 2017	Oct. 07, 2016
Amended And Restated Loan Agreement [Member]
Debt Instrument [Line Items]
Line of credit maturity date			Jul. 31, 2019
Outstanding debt balance paid off	$ 27,500,000
Amended And Restated Loan Agreement [Member] \| September 29, 2017 through July 31, 2019 [Member]
Debt Instrument [Line Items]
Line of credit facility maximum borrowing capacity					$ 60,000,000
Amended And Restated Loan Agreement [Member] \| November 1, 2017 through December 31, 2017 [Member]
Debt Instrument [Line Items]
Line of credit facility maximum borrowing capacity				$ 80,000,000
Amended And Restated Loan Agreement [Member] \| January 1, 2018 through July 31, 2019 [Member]
Debt Instrument [Line Items]
Line of credit facility maximum borrowing capacity				$ 60,000,000
Credit Agreement [Member]
Debt Instrument [Line Items]
Line of credit facility maximum borrowing capacity	130,000,000
Debt instrument, effective rate			3.80%
Debt instrument description of variable interest rate			At the Company's option, the interest rate applicable to the Revolver or DDTL will be a floating rate equal to: (i) the base rate plus a margin of 25 to 100 basis points ("bps"), based upon the Company's rent adjusted leverage ratio, or (ii) a fixed rate for a one-, two-, three- or six-month interest period equal to LIBOR for such interest period plus a margin of 125 to 200 bps, based upon the Company's rent adjusted leverage ratio (effective rate of 3.8% at October 28, 2018).
Credit Agreement [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of credit facility maximum borrowing capacity	$ 80,000,000
Line of credit maturity date	May 17, 2023
Credit Agreement [Member] \| Delayed Draw Term Loan ("DDTL") [Member]
Debt Instrument [Line Items]
Line of credit facility maximum borrowing capacity	$ 50,000,000
Line of credit maturity date	May 17, 2023
Minimum [Member] \| Credit Agreement [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Debt instrument variable interest rate	0.25%
Minimum [Member] \| Credit Agreement [Member] \| LIBOR [Member]
Debt Instrument [Line Items]
Debt instrument variable interest rate	1.25%
Maximum [Member] \| Credit Agreement [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Debt instrument variable interest rate	1.00%
Maximum [Member] \| Credit Agreement [Member] \| LIBOR [Member]
Debt Instrument [Line Items]
Debt instrument variable interest rate	2.00%
SRV [Member] \| SRV Mortgage Term A Note [Member]
Debt Instrument [Line Items]
Debt, original balance			$ 800,000
Debt instrument, maturity date			Sep. 30, 2017
Required monthly principal payments			$ 3,300
Debt instrument stated percentage interest rate			3.10%
SRV [Member] \| SRV Mortgage Term A Note [Member] \| Debt Refinanced [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date		Sep. 30, 2022
Required monthly principal payments		$ 3,300
Debt instrument stated percentage interest rate		3.69%
SRV [Member] \| SRV Mortgage Term B Note [Member]
Debt Instrument [Line Items]
Debt, original balance		$ 800,000
Debt instrument, maturity date		Sep. 30, 2022
Required monthly principal payments		$ 3,300
Debt instrument stated percentage interest rate		3.69%