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LONG-TERM INCENTIVE PLAN - Additional Information (Detail)
$ in Millions
3 Months Ended
Jun. 27, 2019
USD ($)
shares
Apr. 15, 2019
Installment
shares
Sep. 30, 2019
shares
Jun. 30, 2019
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation arrangement by share-based payment award, award vesting commencing date   Jul. 15, 2019    
Share-based compensation arrangement by share-based payment award, award vesting period   4 years    
Share-based compensation arrangement by share-based payment award,vesting period grant date   3 months    
Threshold Performance Condition, For Year 2019        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting percentage   25.00%    
Target Performance Condition, For Year 2020        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting percentage   50.00%    
Maximum Performance Condition, For Year 2021        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting percentage   100.00%    
Restricted phantom units | Amended and Restated 2019 Long-Term Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation arrangement by share-based payment award, equity instruments other than options, grants in Period 238,553 1,015,047    
Phantom Units Subject to Time-based Vesting        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of equal annual installments | Installment   3    
Share-based compensation arrangement by share-based payment award, award vesting commencing date   Apr. 03, 2020    
Phantom Units Subject to Time-based Vesting | Amended and Restated 2019 Long-Term Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation arrangement by share-based payment award, equity instruments other than options, grants in Period   494,421    
Phantom Units Subject to Performance-based Vesting | Amended and Restated 2019 Long-Term Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation arrangement by share-based payment award, equity instruments other than options, grants in Period   520,626    
Restricted Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation arrangement by share-based payment award, equity instruments other than options, grants in Period     31,607 31,295
Share-based compensation arrangement by share-based payment award, equity instruments other than options, vested in period     49,379 48,924
Share-based compensation arrangement by share-based payment award, equity instruments other than options, settled in period     17,772 17,629
Restricted Units | Officer        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation arrangement by share-based payment award, equity instruments other than options, grants in Period   275,000    
Phantom and Restricted Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation arrangement by share-based payment award, equity instruments other than options, grants in Period 975,142      
Share-based compensation arrangement by share-based payment award, equity instruments other than options, vested in period 1,351,493      
Share-based compensation arrangement by share-based payment award, equity instruments other than options, settled in period 376,351      
Unit-based compensation expense recognized | $ $ 2.2