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Investments (Tables)
 12 Months Ended
Sep. 27, 2019
Investments, Debt and Equity Securities [Abstract]  
Summary of Available for Sale Investments The amortized cost, gross unrealized holding gains or losses and fair value of our available-for-sale investments by major investments type as of September 27, 2019 and September 28, 2018 are summarized in the tables below (in thousands): 
 
September 27, 2019
 
Amortized Cost
Gross Unrealized Holding Gains
Gross Unrealized Holding Losses
Aggregate Fair Value
Corporate bonds
 
$
29,578

 
$
112

 
$
(93
)
 
$
29,597

Commercial paper
 
71,646

 
1

 
(18
)
 
71,629

Total investments
 
$
101,224

 
$
113

 
$
(111
)
 
$
101,226


 
September 28, 2018
 
Amortized Cost
Gross Unrealized Holding Gains
Gross Unrealized Holding Losses
Aggregate Fair Value
Corporate bonds
 
$
28,731

 
$
—

 
$
(460
)
 
$
28,271

Commercial paper
 
69,966

 
—

 
(16
)
 
69,950

Total investments
 
$
98,697

 
$
—

 
$
(476
)
 
$
98,221
Summary of Contractual Maturities of Investments
The contractual maturities of available-for-sale investments were as follows (in thousands):
 
September 27, 2019
Less than 1 year
$
75,233

Over 1 year
25,993

Total investments
$
101,226