Debt - Additional Information (Details)	9 Months Ended
Jun. 29, 2019 USD ($)	Sep. 29, 2018 USD ($)
Debt Instrument [Line Items]
Fixed charge ratio, covenant one	1.0
Fixed charge ratio, covenant two	1.15
Outstanding debt	$ 39,821,000	$ 39,764,000
Letter of Credit
Debt Instrument [Line Items]
Unused borrowing capacity		$ 4,500,000
Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity	80,000,000.0
Credit Facility \| Letter of Credit
Debt Instrument [Line Items]
Unused borrowing capacity	$ 4,500,000
LIBOR
Debt Instrument [Line Items]
Interest rate, spread on variable rate	2.25%
LIBOR \| Credit Facility
Debt Instrument [Line Items]
Interest rate, spread on variable rate	2.50%

Debt Instrument, Fixed Charge Ratio, Covenant One1

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- Definition

Debt Instrument, Fixed Charge Ratio, Covenant Two

+ References

No definition available.

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- Definition

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

+ References

No definition available.

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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.

+ References

No definition available.

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- Definition

Amount of unused borrowing capacity under the long-term financing arrangement that is available to the entity as of the balance sheet date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
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