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Unit-Based Compensation Arrangements - Additional Information (Details) - USD ($) | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 25, 2022 | Dec. 25, 2021 | Jun. 26, 2021 | Dec. 26, 2020 | Jun. 25, 2022 | Jun. 26, 2021 | Sep. 25, 2021 | Jul. 31, 2019
Distribution Equivalent Rights Plan [Member] |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Compensation expense | $ 295,000 |  | $ 216,000 |  | $ 889,000 | $ 629,000 |  |
Distribution Equivalent Rights Plan, terms |  |  |  |  | On January 17, 2017, the Partnership adopted the Distribution Equivalent Rights Plan (the “DER Plan”), which gives the Compensation Committee of the Partnership’s Board of Supervisors discretion to award distribution equivalent rights (“DERs”) to executive officers of the Partnership. Once awarded, DERs entitle the grantee to a cash payment each time the Board of Supervisors declares a cash distribution on the Partnership’s Common Units, which cash payment will be equal to an amount calculated by multiplying the number of unvested restricted units which are held by the grantee on the record date of the distribution, by the amount of the declared distribution per Common Unit. |  |  |
2009 Restricted Unit Plan [Member] |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Total number of Common Units authorized for issuance (in units) |  |  |  |  |  |  |  | 2,400,000
Awards Granted |  |  |  |  | 884,658 |  |  |
Aggregate grant date fair value of restricted units awarded |  |  |  |  | $ 11,471 |  |  |
2009 and 2018 Restricted Unit Plan [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Total number of Common Units authorized for issuance (in units) | 3,525,000 |  |  |  | 3,525,000 |  |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Unrecognized compensation cost | $ 6,400,000 |  |  |  | $ 6,400,000 |  |  |
Weighted-average recognition period of compensation cost |  |  |  |  | 1 year |  |  |
Compensation expense | $ 2,813,000 |  | 2,571,000 |  | $ 8,422,000 | 7,524,000 |  |
Restricted Stock Units (RSUs) [Member] | Maximum [Member] | Vesting each of the first three anniversaries of the award grant date [Member] |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Restricted unit awards vesting percentage |  |  |  |  | 33.33% |  |  |
2018 Restricted Unit Plan [Member] |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Additional number of Common Units authorized for issuance (in units) |  |  |  |  | 1,725,000 |  |  |
2018 Restricted Unit Plan [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Total number of Common Units authorized for issuance (in units) | 1,800,000 |  |  |  | 1,800,000 |  |  |
Long-Term Incentive Plan [Member] |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Long-Term Incentive Plan, terms of award |  |  |  |  | The LTIPs are non-qualified, unfunded, long-term incentive plans for executive officers and key employees that provide for payment, in the form of cash, of an award of equity-based compensation at the end of a three-year performance period. |  |  |
Measurement period of average distribution coverage ratio |  |  |  |  | 3 years |  |  |
Long-Term Incentive Plan, compensation earned, description |  |  |  |  | . The level of compensation earned under the fiscal 2021 award is evaluated using two separate measurement components: (i) 75% weight based on the level of average distributable cash flow of the Partnership over the three-year measurement period; and (ii) 25% weight based on the achievement of certain operating and strategic objectives, set by the Compensation Committee of the Board of Supervisors, over that award’s three-year measurement period. The level of compensation earned under the fiscal 2022 award, and measurement periods thereafter, is also evaluated using two separate measurement components: (i) 50% weight based on the level of average distributable cash flow of the Partnership over the three-year measurement period; and (ii) 50% weight based on the achievement of certain operating and strategic objectives, set by the Compensation Committee of the Board of Supervisors for that award’s three-year measurement period. |  |  |
Compensation expense (income) | $ 2,227,000 |  | $ 620,000 |  | $ 5,499,000 | $ 3,696,000 |  |
Liability included within accrued employment and benefit costs (or other liabilities, as applicable) related to estimated future payments under the LTIP | $ 10,698,000 |  |  |  | $ 10,698,000 |  | $ 9,184,000 |
Cash payouts |  | $ 3,985,000 |  | $ 3,354,000 |  |  |  |

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