Notes Payable and Long-Term Debt (Narrative) (Details) - USD ($)	12 Months Ended
	Sep. 29, 2020	Sep. 24, 2019	May 07, 2020
Debt Instrument [Line Items]
Interest expense	$ 754,000	$ 755,000
Cadence Credit Facility [Member]
Debt Instrument [Line Items]
Loan agreement, increase amount	$ 17,000,000
Interest rate	0.25%
Weighted average interest rate	3.75%
Interest rate description	All borrowings under the Cadence Credit Facility, as amended, bear interest at a variable rate based upon the Company’s election of (i) 2.5% plus the base rate, which is the highest of the (a) Federal Funds Rate plus 0.5%, (b) the Cadence bank publicly-announced prime rate, and (c) LIBOR plus 1.0%, or (ii) LIBOR, with a 0.250% floor, plus 3.5%. Interest is due at the end of each calendar quarter if the Company selects to pay interest based on the base rate and at the end of each LIBOR period if it selects to pay interest based on LIBOR.
Payment of debt issuance costs	$ 292,000
Maturity date	Dec. 31, 2021
Minimum liquidity amount	$ 2,000,000
Letters of credit outstanding, amount	5,500,000
Letters of credit outstanding face value	157,500
Periodic principal payment amount	250,000
Paycheck Protection Program [Member] | Cadence Bank, N.A. [Member]
Debt Instrument [Line Items]
Weighted average interest rate			1.00%
Unsecured loan aggregate principal amount	5,200,000		$ 11,645,000
Monthly payments installment	$ 489,000