Segment reporting - (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 26, 2020
USD ($)
country
Sep. 28, 2019
USD ($)
Sep. 26, 2020
USD ($)
segment
country
Sep. 28, 2019
USD ($)
Mar. 28, 2020
USD ($)
Segment reporting          
Number of reportable segments | segment     2    
Segment reporting          
Sales $ 248,241 $ 236,432 $ 399,927 $ 445,952  
Adjusted EBITDA 44,083 22,426 48,546 33,069  
Interest expense, net 4,491 5,402 9,441 11,111  
Assets $ 1,108,054 1,140,572 $ 1,108,054 1,140,572 $ 1,166,814
Elfa          
Segment reporting          
Number of countries in which products are sold on wholesale basis | country 30   30    
Operating segments | TCS          
Segment reporting          
Sales $ 233,004 221,235 $ 372,390 416,311  
Adjusted EBITDA 38,278 18,661 40,003 28,896  
Interest expense, net 4,395 5,289 9,242 10,904  
Assets 1,012,629 1,049,096 1,012,629 1,049,096  
Operating segments | Elfa          
Segment reporting          
Sales 15,237 15,197 27,537 29,641  
Adjusted EBITDA 5,736 5,950 8,673 8,037  
Interest expense, net 96 113 199 207  
Assets 102,180 98,166 102,180 98,166  
lntersegment          
Segment reporting          
Sales (14,892) (20,865) (23,584) (32,415)  
Adjusted EBITDA 69 (2,185) (130) (3,864)  
Assets (6,755) (6,690) (6,755) (6,690)  
lntersegment | Elfa          
Segment reporting          
Sales $ 14,892 $ 20,865 $ 23,584 $ 32,415