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Stock-based compensation - Restricted Stock Unit Activity (Details) - Restricted Stock Units - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Dec. 29, 2018
Sep. 29, 2018
Number of Units    
Outstanding, beginning balance (in shares) 0  
Forfeited (in shares) 579,841  
Exercised (in shares) 0  
Granted (in shares) 0  
Outstanding, ending balance (in shares) 579,841  
Weighted Average Grant Date Fair Value    
Outstanding, beginning balance (in usd per share) $ 0.00  
Outstanding, ending balance (in usd per share) $ 14.91  
Additional Information    
Options vested and expected to vest 434,360  
Options vested and expected to vest - Weighted Average Exercise Price (in USD per share) $ 14.92  
Options vested and expected to vest - Weighted Average Intrinsic Value $ 4,209  
Weighted Average Intrinsic Value $ 5,619 $ 0