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Marketable Securities
 6 Months Ended
Mar. 28, 2020
Marketable Securities [Abstract]  
Marketable Securities Marketable Securities
The amortized cost and fair value of marketable securities as of March 28, 2020 and September 30, 2019 were as follows:
(in thousands)
March 28, 2020

Amortized cost
 
Gross unrealized
gains
 
Gross unrealized losses
 
Fair value
Commercial paper
$
1,482

 
$
—

 
$
—

 
$
1,482

Corporate notes/bonds
55,884

 
85

 
(510
)
 
55,459


$
57,366

 
$
85

 
$
(510
)
 
$
56,941


(in thousands)
September 30, 2019

Amortized cost
 
Gross unrealized
gains
 
Gross unrealized losses
 
Fair value
Commercial paper
$
999

 
$
—

 
$
—

 
$
999

Corporate notes/bonds
56,318

 
146

 
(28
)
 
56,436


$
57,317

 
$
146

 
$
(28
)
 
$
57,435


Our investment portfolio consists of certificates of deposit, commercial paper, corporate notes/bonds and government securities that have a maximum maturity of three years. The longer the duration of these securities, the more susceptible they are to changes in market interest rates and bond yields. All unrealized losses are due to changes in market interest rates, bond yields and/or credit ratings.
We review our investments to identify and evaluate investments that have an indication of possible impairment. We concluded that, at March 28, 2020, the unrealized losses were temporary.
The following tables summarize the fair value and gross unrealized losses aggregated by category and the length of time that individual securities have been in a continuous unrealized loss position as of March 28, 2020 and September 30, 2019.
(in thousands)

March 28, 2020
 
Less than twelve months
 
Greater than twelve months
 
Total
 
Fair Value
 
Gross unrealized loss
 
Fair Value
 
Gross unrealized loss
 
Fair Value
 
Gross unrealized loss
Corporate notes/bonds
$
44,598

 
$
(510
)
 
$
—

 
$
—

 
$
44,598

 
$
(510
)
(in thousands)

September 30, 2019
 
Less than twelve months
 
Greater than twelve months
 
Total
 
Fair Value
 
Gross unrealized loss
 
Fair Value
 
Gross unrealized loss
 
Fair Value
 
Gross unrealized loss
Corporate notes/bonds
$
12,419

 
$
(14
)
 
$
16,369

 
$
(14
)
 
$
28,788

 
$
(28
)

The following table presents our marketable securities by contractual maturity date as of March 28, 2020 and September 30, 2019.
(in thousands)
March 28, 2020
 
September 30, 2019

Amortized cost
 
Fair value
 
Amortized cost
 
Fair value
Due in one year or less
$
34,305

 
$
34,135

 
$
27,725

 
$
27,735

Due after one year through three years
23,061

 
22,806

 
29,592

 
29,700


$
57,366

 
$
56,941

 
$
57,317

 
$
57,435