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Shareholders' equity - Common stock (Details)
$ / shares in Units, $ in Thousands
12 Months Ended
Mar. 31, 2018
$ / shares
shares
Mar. 28, 2020
USD ($)
Vote
$ / shares
shares
Mar. 30, 2019
$ / shares
shares
Apr. 01, 2017
$ / shares
Shareholders' equity        
Common stock, par value (in dollars per share) | $ / shares   $ 0.01 $ 0.01 $ 0.01
Common stock, shares authorized   250,000,000 250,000,000  
Common stock, shares issued   48,316,559 48,142,319  
Common stock        
Shareholders' equity        
Shares issued 27,073      
Issue price (in dollars per share) | $ / shares $ 4.99      
Number of votes per share entitled to holders | Vote   1    
Redemptions or sinking fund provisions | $   $ 0