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Unit-Based Compensation Arrangements - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 29, 2019 | Jun. 30, 2018 | Jun. 29, 2019 | Jun. 30, 2018 | Sep. 29, 2018
Distribution Equivalent Rights Plan [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Compensation expense | $ 264 | $ 201 | $ 784 | $ 609 |
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 |  | 2,400,000 |  |
Restricted Unit Plans, terms of award |  |  | Unless otherwise stipulated by the Compensation Committee of the Partnership’s Board of Supervisors on or before the grant date, all currently outstanding restricted unit awards will vest 33.33% on each of the first three anniversaries of the award grant date. Participants in the Restricted Unit Plans are not eligible to receive quarterly distributions on, or vote, their respective restricted units until vested. Restricted units cannot be sold or transferred prior to vesting. The value of the restricted unit is established by the market price of the Common Unit on the date of grant, net of estimated future distributions during the vesting period. Restricted units are subject to forfeiture in certain circumstances as defined in the Restricted Unit Plans documents. Compensation expense for the unvested awards is recognized ratably over the vesting periods and is net of estimated forfeitures. |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Awards Granted |  |  | 618,268 |  |
Aggregate grant date fair value of restricted units awarded |  |  | $ 11,212 |  |
Unrecognized compensation cost | $ 5,340 |  | $ 5,340 |  |
Weighted-average recognition period of compensation cost |  |  | 1 year |  |
Compensation expense | $ 2,280 | 1,715 | $ 8,855 | 6,862 |
Restricted Stock Units (RSUs) [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 |  |
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% |  |
Long-Term Incentive Plan [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Long-Term Incentive Plan, terms of award |  |  | The LTIP is a non-qualified, unfunded, long-term incentive plan for executive officers and key employees that provides 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 |  |
Compensation expense | $ 1,271 | $ 595 | $ 4,470 | $ 2,719 |
Liability included within accrued employment and benefit costs (or other liabilities, as applicable) related to estimated future payments under the LTIP | $ 9,286 |  | $ 9,286 |  | $ 4,817

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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