Post-effective amendment to a registration statement that is not immediately effective upon filing

PENSION AND OTHER RETIREMENTS BENEFITS - Narrative (Details)

v3.21.1
PENSION AND OTHER RETIREMENTS BENEFITS - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Jun. 25, 2020
Dec. 31, 2019
Dec. 31, 2018
Jun. 26, 2020
Defined Benefit Plan Disclosure              
Net pension asset (liability)     $ (8,054) $ (9,205) $ (7,641)    
Defined contribution plan, cost     200 300 300 $ 300  
Nonqualified Plan              
Defined Benefit Plan Disclosure              
Pension benefit obligation     10,300 9,700 9,000    
Pension Plan              
Defined Benefit Plan Disclosure              
Pension benefit obligation     41,112 39,879 37,854 34,000 $ 39,879
Total pension plan assets measured at fair value     33,058 30,674 30,213 25,800  
Net periodic benefit cost $ (115) $ 105 (169) 126 2,438 2,170  
Pension Plan | Foreign Plan              
Defined Benefit Plan Disclosure              
Net pension asset (liability)     (3,300)   (2,800)    
Pension benefit obligation     6,300   5,600    
Total pension plan assets measured at fair value     3,000   2,800    
Net periodic benefit cost     $ 200 $ 300 $ 300 $ 500