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Stockholders' Equity (Narrative) (Details) - USD ($) | 12 Months Ended
--- | ---
Sep. 25, 2018 | Sep. 26, 2017
Schedule Of Stockholders Equity [Line Items] |  |  |
Preferred stock, shares authorized |  | 5,000,000 | 5,000,000
Common stock, shares authorized |  | 50,000,000 | 50,000,000
Common stock, shares outstanding |  | 12,481,162 | 12,427,280
Common stock, par value |  | $ 0.001 | $ 0.001
Stock based compensation expense |  | $ 417,000 | $ 748,000
Stock option exercise |  | $ 29,000 |
Stock option exercise, shares |  | 9,397 |
Aggregate intrinsic value of outstanding options |  | $ 787,000 |
Incentive Stock Option [Member] |  |  |
Schedule Of Stockholders Equity [Line Items] |  |  |
Stock options granted, shares |  | 18,274 | 163,992
Incentive Stock Option [Member] | Minimum [Member] |  |  |
Schedule Of Stockholders Equity [Line Items] |  |  |
Stock options granted, exercise price |  | $ 2.70 | $ 3.05
Stock options granted, per-share weighted average fair value |  | 1.65 | 2.17
Incentive Stock Option [Member] | Maximum [Member] |  |  |
Schedule Of Stockholders Equity [Line Items] |  |  |
Stock options granted, exercise price |  | 2.73 | 3.45
Stock options granted, per-share weighted average fair value |  | $ 1.95 | $ 2.49
Incentive and Non-Statutory Stock Options [Member] |  |  |
Schedule Of Stockholders Equity [Line Items] |  |  |
Stock options granted, shares |  | 129,381 |
Expected term (years) | [1] | 7 years 6 months |
Incentive and Non-Statutory Stock Options [Member] | Minimum [Member] |  |  |
Schedule Of Stockholders Equity [Line Items] |  |  |
Stock options granted, exercise price |  | $ 3.55 |
Stock options granted, per-share weighted average fair value |  | 2.08 |
Expected term (years) |  |  | 6 years 6 months
Incentive and Non-Statutory Stock Options [Member] | Maximum [Member] |  |  |
Schedule Of Stockholders Equity [Line Items] |  |  |
Stock options granted, exercise price |  | 4.25 |
Stock options granted, per-share weighted average fair value |  | $ 2.52 |
Expected term (years) |  |  | 7 years 6 months
Restricted Stock [Member] |  |  |
Schedule Of Stockholders Equity [Line Items] |  |  |
Restricted stock granted, shares |  | 97,544 | 103,440
Restricted stock granted, weighted average grant date fair value per share |  | $ 2.70 |
Vesting period |  | 3 years | 3 years
Remaining total unrecognized compensation cost related to unvested stock-based arrangements |  | $ 341,000 |
Employee service share-based compensation, nonvested awards, total compensation cost not yet recognized, period for recognition |  | 1 year 7 months 6 days |
Restricted Stock [Member] | Minimum [Member] |  |  |
Schedule Of Stockholders Equity [Line Items] |  |  |
Restricted stock granted, weighted average grant date fair value per share |  | $ 2.70 | $ 3.15
Restricted Stock [Member] | Maximum [Member] |  |  |
Schedule Of Stockholders Equity [Line Items] |  |  |
Restricted stock granted, weighted average grant date fair value per share |  | $ 3.55 | $ 3.20
Stock Options [Member] |  |  |
Schedule Of Stockholders Equity [Line Items] |  |  |
Stock options granted, shares | [2] | 147,655 |
Stock options granted, exercise price | [2] | $ 3.68 |
Remaining total unrecognized compensation cost related to unvested stock-based arrangements |  | $ 431,000 |
Employee service share-based compensation, nonvested awards, total compensation cost not yet recognized, period for recognition |  | 2 years 4 months 6 days |
Stock option exercise, shares |  | 9,398 |
Replacement Options [Member] |  |  |
Schedule Of Stockholders Equity [Line Items] |  |  |
Stock options granted, shares |  | 49,491 |
Stock options granted, exercise price |  | $ 4.25 |
Vesting period |  | 10 years |
Percentage of vested options |  | 100.00% |
Two Thousand Eight Equity Incentive Compensation Plan [Member] |  |  |
Schedule Of Stockholders Equity [Line Items] |  |  |
Shares authorized to issue under plan |  | 1,500,000 |
2018 Plan [Member] |  |  |
Schedule Of Stockholders Equity [Line Items] |  |  |
Shares authorized to issue under plan |  | 750,000 |
Shares available for future grants |  | 499,605 |
2018 Plan [Member] | Restricted Stock [Member] |  |  |
Schedule Of Stockholders Equity [Line Items] |  |  |
Restricted stock granted, shares |  | 60,507 |
Restricted stock granted, weighted average grant date fair value per share |  | $ 3.55 |
Vesting period |  | 3 years |
Exchange Program [Member] |  |  |
Schedule Of Stockholders Equity [Line Items] |  |  |
Stock options granted, shares |  | 129,025 |
Stock options granted, per-share weighted average fair value |  | $ 2.08 |
Percentage of vested options |  | 100.00% |
Expected volatility |  | 53.71% |
Risk-free interest rate |  | 2.83% |
Expected term (years) |  | 5 years |
Exchange Program [Member] | Minimum [Member] |  |  |
Schedule Of Stockholders Equity [Line Items] |  |  |
Stock options granted, exercise price |  | $ 7.79 |
Exchange Program [Member] | Maximum [Member] |  |  |
Schedule Of Stockholders Equity [Line Items] |  |  |
Stock options granted, exercise price |  | $ 9.17 |
[1] | Excluding options issued in the exchange program
[2] | In connection with the Exchange Program, 129,025 options to purchase common stock were canceled, and 49,491 Replacement Options were granted.

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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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