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Fair value measurements (Tables)
 12 Months Ended
Sep. 28, 2019
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 28, 2019 and September 29, 2018:
 
2019
(In thousands)
Level 1
 
Level 2
 
Level 3
 
Total
Assets:
 
 
 
 
 
 
 
Money market funds (cash equivalents)
$
267,806

 
$
—

 
$
—

 
$
267,806


 
2018
(In thousands)
Level 1
 
Level 2
 
Level 3
 
Total
Assets:
 
 
 
 
 
 
 
Money market funds (cash equivalents)
$
140,588

 
$
—

 
$
—

 
$
140,588