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Related party transactions - Narrative (Details) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
Jan. 31, 2018
Mar. 28, 2020
Mar. 30, 2019
Dec. 28, 2019
Jul. 03, 2014
Related Party Transaction          
Net sales   $ 710,100,000 $ 804,900,000    
Dividends received from equity method investees   0 0    
Effects of change in ownership interest     15,000,000.0    
Sponsor | Former transaction and monitoring fee agreement          
Related Party Transaction          
Related party transaction, fee as a percentage of EBITDA         1.00%
Related party transaction, expenses incurred   1,700,000   $ 1,800,000  
Sponsor | Support and services agreement          
Related Party Transaction          
Related party transaction, ownership percentage threshold which terminates milestone payment 5.00%        
Related party transaction, fair value of equity threshold which terminates milestone payment $ 25,000,000.0        
Equity method investees          
Related Party Transaction          
Sales   300,000 $ 300,000    
Payables to related parties   $ 200,000   $ 200,000