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Fair Value - Quantitative Information Used in Fair Value Calculation of Level 3 Liabilities (Details) - $ / shares
12 Months Ended
Dec. 28, 2016
Sep. 29, 2017
Sep. 30, 2016
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]      
Discount rate 8.50%    
Unobservable Inputs (Level 3) | Discounted cash flow | Fair Value, Measurements, Recurring | Contingent consideration      
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]      
Discount rate   9.20% 12.90%
Expected term     1 year
Unobservable Inputs (Level 3) | Discounted cash flow | Fair Value, Measurements, Recurring | Contingent consideration | Minimum      
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]      
Probability of achievement   70.00%  
Expected term   2 months  
Unobservable Inputs (Level 3) | Discounted cash flow | Fair Value, Measurements, Recurring | Contingent consideration | Maximum      
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]      
Probability of achievement   100.00%  
Expected term   8 months  
Unobservable Inputs (Level 3) | Black-scholes model | Fair Value, Measurements, Recurring | Common stock warrant liability      
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]      
Discount rate   1.62% 1.14%
Expected term   3 years 2 months 23 days 4 years 2 months 23 days
Volatility   44.90% 43.20%
Exercise price (in USD per share)   $ 14.05 $ 14.05
Share price (in USD per share)   $ 44.61 $ 42.34
Dividend rate   0.00% 0.00%