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Short Term Investments
 9 Months Ended
Jul. 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):
 July 3, 2020
 Amortized
Cost		 Gross
Unrealized
Holding Gains 		  Gross
Unrealized
Holding Losses		 Aggregate Fair
Value
Corporate bonds$30,097    $354  $(179) $30,272  
Commercial paper102,749  247  (20) 102,976  
Total short-term investments$132,846    $601  $(199) $133,248  
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 paper71,646  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):
 July 3, 2020 September 27, 2019
Less than 1 year$109,156  $75,233  
Over 1 year24,092  25,993  
Total short-term investments$133,248  $101,226