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Share-based compensation - Summary of Key Inputs (Details) - USD ($)
$ in Thousands
Jan. 02, 2018
May 26, 2017
Total Shareholder Return    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Percentage of Total Award 50.00% 50.00%
Grant Date Fair Value by Component $ 860 $ 770
Volatility 26.13% 27.02%
Interest Rate 2.00% 1.39%
Dividend Yield 0.00% 0.00%
Adjusted EBITDA Comparison    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Percentage of Total Award 50.00% 50.00%
Grant Date Fair Value by Component $ 1,475 $ 1,350
Volatility 0.00% 0.00%
Interest Rate 0.00% 0.00%
Dividend Yield 0.00% 0.00%