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Marketable Securities (Tables)
 9 Months Ended
Jul. 01, 2017
Marketable Securities [Abstract]  
Marketable Securities
The amortized cost and fair value of marketable securities as of July 1, 2017 and September 30, 2016 were as follows:

July 1, 2017

Amortized cost
 
Gross unrealized gains
 
Gross unrealized losses
 
Fair value
 
(in thousands)
Certificates of deposit
$
441

 
$
—

 
$
—

 
$
441

Corporate notes/bonds
47,519

 
—

 
(165
)
 
47,354

US government agency securities
2,401

 
—

 
(7
)
 
2,394


$
50,361

 
$
—

 
$
(172
)
 
$
50,189


September 30, 2016

Amortized cost
 
Gross unrealized gains
 
Gross unrealized losses
 
Fair value
 
(in thousands)
Certificates of deposit
$
681

 
$
—

 
$
—

 
$
681

Commercial paper
11,945

 
—

 
(20
)
 
11,925

Corporate notes/bonds
34,701

 
—

 
(100
)
 
34,601

US government agency securities
2,411

 
—

 
(2
)
 
2,409


$
49,738

 
$
—

 
$
(122
)
 
$
49,616
Investments Classified by Contractual Maturity Date
The following table presents our available-for-sale marketable securities by contractual maturity date as of July 1, 2017 and September 30, 2016.

July 1, 2017
 
September 30, 2016

Amortized cost
 
Fair value
 
Amortized cost
 
Fair value
 
(in thousands)
 
(in thousands)
Due in one year or less
$
19,129

 
$
19,095

 
$
18,585

 
$
18,549

Due after one year through three years
31,232

 
31,094

 
31,153

 
31,067


$
50,361

 
$
50,189

 
$
49,738

 
$
49,616