Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Summary of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details)

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Fair Value Measurements - Summary of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - Recurring - USD ($)
$ in Thousands
Jun. 29, 2019
Sep. 29, 2018
Jun. 30, 2018
Assets:      
Short term investments $ 119    
Total assets 119    
Liabilities:      
Liabilities, fair value disclosure 7,824 $ 8,224 $ 7,645
Liability for contingent consideration      
Liabilities:      
Liabilities, fair value disclosure 7,824 8,224 7,645
Level 1      
Assets:      
Short term investments 119    
Total assets 119    
Liabilities:      
Liabilities, fair value disclosure 0 0 0
Level 1 | Liability for contingent consideration      
Liabilities:      
Liabilities, fair value disclosure 0 0 0
Level 2      
Assets:      
Short term investments 0    
Total assets 0    
Liabilities:      
Liabilities, fair value disclosure 0 0 0
Level 2 | Liability for contingent consideration      
Liabilities:      
Liabilities, fair value disclosure 0 0 0
Level 3      
Assets:      
Short term investments 0    
Total assets 0    
Liabilities:      
Liabilities, fair value disclosure 7,824 8,224 7,645
Level 3 | Liability for contingent consideration      
Liabilities:      
Liabilities, fair value disclosure $ 7,824 $ 8,224 $ 7,645