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Marketable Securities
 3 Months Ended
Dec. 29, 2018
Marketable Securities [Abstract]  
Marketable Securities
Marketable Securities
The amortized cost and fair value of marketable securities as of December 29, 2018 and September 30, 2018 were as follows:

December 29, 2018

Amortized cost
 
Gross unrealized gains
 
Gross unrealized losses
 
Fair value
 
(in thousands)
Certificates of deposit
$
221

 
$
—

 
$
(1
)
 
$
220

Commercial paper
1,961

 
—

 
(5
)
 
1,956

Corporate notes/bonds
52,868

 
6

 
(394
)
 
52,480

U.S. government agency securities
1,000

 
—

 
(5
)
 
995


$
56,050

 
$
6

 
$
(405
)
 
$
55,651


September 30, 2018

Amortized cost
 
Gross unrealized gains
 
Gross unrealized losses
 
Fair value
 
(in thousands)
Certificates of deposit
$
220

 
$
—

 
$
(1
)
 
$
219

Corporate notes/bonds
55,140

 
—

 
(403
)
 
54,737

U.S. government agency securities
1,004

 
—

 
(9
)
 
995


$
56,364

 
$
—

 
$
(413
)
 
$
55,951


Our investment portfolio consists of certificates of deposit, commercial paper, corporate notes/bonds and government securities that have a maximum maturity of two 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 December 29, 2018, 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 December 29, 2018 and September 30, 2018.
 
December 29, 2018
 
Less than twelve months
 
Greater than twelve months
 
Total
 
Fair Value
 
Gross unrealized loss
 
Fair Value
 
Gross unrealized loss
 
Fair Value
 
Gross unrealized loss
 
(in thousands)
Certificates of deposit
$
—

 
$
—

 
$
220

 
$
(1
)
 
$
220

 
$
(1
)
Commercial paper
1,956

 
(5
)
 
—

 
—

 
1,956

 
(5
)
Corporate notes/bonds
22,303

 
(119
)
 
27,695

 
(275
)
 
49,998

 
(394
)
U.S. government agency securities
—

 
—

 
995

 
(5
)
 
995

 
(5
)
 
$
24,259

 
$
(124
)
 
$
28,910

 
$
(281
)
 
$
53,169

 
$
(405
)

 
September 30, 2018
 
Less than twelve months
 
Greater than twelve months
 
Total
 
Fair Value
 
Gross unrealized loss
 
Fair Value
 
Gross unrealized loss
 
Fair Value
 
Gross unrealized loss
 
(in thousands)
Certificates of deposit
$
219

 
$
(1
)
 
$
—

 
$
—

 
$
219

 
$
(1
)
Corporate notes/bonds
24,067

 
(70
)
 
30,670

 
(333
)
 
54,737

 
(403
)
U.S. government agency securities
—

 
—

 
995

 
(9
)
 
995

 
(9
)
 
$
24,286

 
$
(71
)
 
$
31,665

 
$
(342
)
 
$
55,951

 
$
(413
)


The following table presents our available-for-sale marketable securities by contractual maturity date as of December 29, 2018 and September 30, 2018.

December 29, 2018
 
September 30, 2018

Amortized cost
 
Fair value
 
Amortized cost
 
Fair value
 
(in thousands)
 
(in thousands)
Due in one year or less
$
25,544

 
$
25,430

 
$
25,792

 
$
25,670

Due after one year through three years
30,506

 
30,221

 
30,572

 
30,281


$
56,050

 
$
55,651

 
$
56,364

 
$
55,951