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Short Term Investments (Tables)
 6 Months Ended
Apr. 03, 2020
Investments, Debt and Equity Securities [Abstract]  
Summary of Available for Sale Investments
Our short-term investments include corporate bonds and commercial paper and are classified as available-for-sale and are summarized in the tables below (in thousands):
 
April 3, 2020
 
Amortized
Cost
 
Gross
Unrealized
Holding Gains
  
Gross
Unrealized
Holding Losses
 
Aggregate Fair
Value
Corporate bonds
$
29,778

  
$
—

 
$
(1,291
)
 
$
28,487

Commercial paper
72,364

 
28

 
(32
)
 
72,360

Total short-term investments
$
102,142

  
$
28

 
$
(1,323
)
 
$
100,847

 
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 short-term investments
$
101,224

 
$
113

 
$
(111
)
 
$
101,226
Summary of Contractual Maturities of Investments
The contractual maturities of available-for-sale investments were as follows (in thousands):
 
April 3, 2020
 
September 27, 2019
Less than 1 year
$
77,862

 
$
75,233

Over 1 year
22,985

 
25,993

Total short-term investments
$
100,847

 
$
101,226