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Related party transactions - Narrative (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Jan. 31, 2018
Sep. 28, 2019
Mar. 30, 2019
Sep. 29, 2018
Sep. 28, 2019
Sep. 29, 2018
Dec. 29, 2018
Jul. 03, 2014
Related Party Transaction [Line Items]                
Dividends received from equity method investees   $ 0   $ 0 $ 0 $ 400,000    
Effects of change in ownership interest     $ 15,000,000          
Blackstone, The Sponsor | Former transaction and monitoring fee agreement                
Related Party Transaction [Line Items]                
Related party transaction, fee as a percentage of EBITDA               1.00%
Related party transaction, expenses incurred   1,100,000   $ 1,900,000 4,900,000 $ 5,900,000    
Blackstone, The Sponsor | New monitoring fee agreement                
Related Party Transaction [Line Items]                
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              
Blackstone, The Sponsor | Support and services agreement                
Related Party Transaction [Line Items]                
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              
Blackstone, The Sponsor | Underwriting fees                
Related Party Transaction [Line Items]                
Related party transaction, expenses incurred $ 3,200,000              
Equity method investees                
Related Party Transaction [Line Items]                
Payables to related parties   $ 200,000     $ 200,000   $ 100,000