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Fair value measurements (Tables)
12 Months Ended
Sep. 29, 2018
Fair Value Disclosures [Abstract]  
Summary of fair value measurements by level for the assets measured on a recurring basis
The following table summarizes fair value measurements by level for the assets measured at fair value on a recurring basis as of September 29, 2018 and September 30, 2017:
 
2018
(In thousands)
Level 1
 
Level 2
 
Level 3
 
Total
Assets:
 
 
 
 
 
 
 
Money market funds (cash equivalents)
$
140,588

 
$

 
$

 
$
140,588


 
2017
(In thousands)
Level 1
 
Level 2
 
Level 3
 
Total
Assets:
 
 
 
 
 
 
 
Money market funds (cash equivalents)
$
40,072

 
$

 
$

 
$
40,072