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Share-Based Employee Compensation (Narrative) (Details) $ / shares in Units, $ in Millions |  | 12 Months Ended
--- | --- | ---
Jul. 31, 2020 shares | Oct. 02, 2022 USD ($) day $ / shares shares | Oct. 03, 2021 USD ($) $ / shares shares | Sep. 27, 2020 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Value of shares issued in connection with director retirements (less than) | $ |  |  |  | $ 0.1
Del Taco RSUs subject to accelerated vesting |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period |  | 4 years |  |
Awards outstanding (in shares) |  | 236,606 | 141,197 |
Total unrecognized compensation cost related to stock options granted | $ |  | $ 9.5 |  |
Weighted-average period for unrecognized compensation cost, (in years) |  | 2 years 4 months 24 days |  |
Weighted-average grant-date fair value (in usd per share) | $ / shares |  | $ 78.28 | $ 95.44 | $ 73.94
Total fair value of awards vested | $ |  | $ 2.5 | $ 4.3 | $ 8.7
Modified restricted stock units vested in period (in shares) |  | 28,600 |  |
Modified Restricted Stock Units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Modified restricted stock units vested in period (in shares) | 23,128 |  |  |
Del Taco options subject to accelerated vesting |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period |  | 3 years |  |
Total unrecognized compensation cost related to stock options granted | $ |  | $ 0.1 |  |
Weighted-average period for unrecognized compensation cost, (in years) |  | 2 months 12 days |  |
Option grants contractual term |  | 7 years |  |
Total intrinsic value of stock options exercised | $ |  | $ 0.1 | $ 1.6 | $ 0.7
Performance share awards |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period |  | 3 years |  |
Awards outstanding (in shares) |  | 65,382 | 35,097 |
Total unrecognized compensation cost related to stock options granted | $ |  | $ 2.7 |  |
Weighted-average period for unrecognized compensation cost, (in years) |  | 1 year 9 months 18 days |  |
Weighted-average grant-date fair value (in usd per share) | $ / shares |  | $ 78.95 | $ 88.88 | $ 81.02
Total fair value of awards vested | $ |  | $ 0.1 | $ 0.6 | $ 0.5
Modified restricted stock units vested in period (in shares) |  | 6,905 |  |
Del Taco RSAs subject to accelerated vesting |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Awards outstanding (in shares) |  | 4,670 | 0 |
Total unrecognized compensation cost related to stock options granted | $ |  | $ 0.2 |  |
Weighted-average period for unrecognized compensation cost, (in years) |  | 4 months 24 days |  |
Weighted-average grant-date fair value (in usd per share) | $ / shares |  | $ 82.33 |  |
Total fair value of awards vested | $ |  | $ 0.7 |  |
Deferred Compensation for Non Management Directors |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Awards outstanding (in shares) |  | 116,274 | 109,463 |
Threshold trading days | day |  | 10 |  |
Shares issued in connection with director retirement (in shares) |  | 0 | 0 | 204
Minimum | Del Taco RSUs subject to accelerated vesting |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Restricted stock units vested, percentage |  | 50.00% |  |
Minimum | Performance share awards |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Performance share awards vesting rights, percentage |  | 0.00% |  |
Maximum | Performance share awards |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Performance share awards vesting rights, percentage |  | 150.00% |  |
Executive Officers | Del Taco RSUs subject to accelerated vesting |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Awards outstanding (in shares) |  | 75,791 |  |
Non-Management Directors | Del Taco RSUs subject to accelerated vesting |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period |  | 12 months |  |
Awards outstanding (in shares) |  | 74,830 |  |
Management | Del Taco RSUs subject to accelerated vesting |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period |  | 3 years |  |
Awards outstanding (in shares) |  | 85,985 |  |
Two Thousand Four Stock Incentive Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Authorized (in shares) |  | 11,600,000 |  |
Common stock available for future issuance (in shares) |  | 1,479,033 |  |
Del Taco Restaurants, Inc. 2015 Omnibus Incentive Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Common stock available for future issuance (in shares) |  | 174,553 |  |
Deferred Compensation Plan for Non-Management Directors |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Authorized (in shares) |  | 350,000 |  |
Common stock available for future issuance (in shares) |  | 142,918 |  |

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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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 (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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