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Unit-Based Compensation Arrangements - Additional Information (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 28, 2019
Sep. 29, 2018
Sep. 30, 2017
Distribution Equivalent Rights Plan [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Compensation expense $ 1,048 $ 810  
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 618,268 424,431 323,715
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, 33.33% of all outstanding awards under the Restricted Unit Plans will vest 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 each 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. 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]      
Unrecognized compensation cost $ 3,660    
Weighted-average recognition period of compensation cost 1 year 2 months 12 days    
Compensation expense $ 10,521 $ 8,198 $ 7,286
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    
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 $ 5,385 3,180 (389)
Cash payouts $ 0 $ 0 $ 0