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Marketable Securities
 12 Months Ended
Sep. 30, 2015
Marketable Securities [Abstract]  
MARKETABLE SECURITIES
MARKETABLE SECURITIES
Our marketable securities consist of certificates of deposit, commercial paper, corporate bonds and government municipal bonds. We analyze our available-for-sale marketable securities for impairment on an ongoing basis. When we perform this analysis, we consider factors such as the length of time and extent to which the securities have been in an unrealized loss position and the trend of any unrealized losses. We also consider whether an unrealized loss is a temporary loss or an other-than-temporary loss such as: (a) whether we have the intent to sell the security, or (b) whether it is more likely than not that we will be required to sell the security before its anticipated recovery, or (c) permanent impairment due to bankruptcy or insolvency.
In order to estimate the fair value for each security in our investment portfolio, we obtain quoted market prices and trading activity for each security where available. We obtain relevant information from our investment advisor and, if warranted, also
6. MARKETABLE SECURITIES (CONTINUED)
may review the financial solvency of certain security issuers. As of September 30, 2015, 44 of our 81 securities that we held were trading below our amortized cost basis. We determined each decline in value to be temporary based upon the above described factors. We expect to realize the fair value of these securities, plus accrued interest, either at the time of maturity or when the security is sold. All of our current holdings are classified as available-for-sale marketable securities and are recorded at fair value on our consolidated balance sheet with the unrealized gains and losses recorded in accumulated other comprehensive loss. All of our current marketable securities will mature in less than one year and our non-current marketable securities will mature in less than 3 years. We received proceeds from the sale of our available-for-sale marketable securities of $38.0 million, $47.4 million and $63.1 million for fiscal 2015, 2014 and 2013, respectively.
At September 30, 2015 our marketable securities were (in thousands):
 
Amortized
Cost (1)
 
Unrealized
Gains
 
Unrealized
Losses
 
Fair Value (1)
Current marketable securities:
 
 
 
 
 
 
 
Corporate bonds
$
31,753

 
$
—

 
$
(39
)
 
$
31,714

Commercial paper
7,986

 
—

 
(1
)
 
7,985

Certificates of deposit
6,253

 
8

 
—

 
6,261

Government municipal bonds
1,232

 
—

 
—

 
1,232

Current marketable securities
47,224

 
8

 
(40
)
 
47,192

Non-current marketable securities:
 
 
 
 
 
 
 
Corporate bonds
4,138

 
—

 
(13
)
 
4,125

Certificates of deposit
7,511

 
3

 
(7
)
 
7,507

Government municipal bonds
1,996

 
—

 
(3
)
 
1,993

Non-current marketable securities
13,645

 
3

 
(23
)
 
13,625

Total marketable securities
$
60,869

 
$
11

 
$
(63
)
 
$
60,817

(1)
Included in amortized cost and fair value is purchased and accrued interest of $252.
At September 30, 2014 our marketable securities were (in thousands):
 
Amortized
Cost (1)
 
Unrealized
Gains
 
Unrealized
Losses
 
Fair Value (1)
Current marketable securities:
 
 
 
 
 
 
 
Corporate bonds
$
24,668

 
$
1

 
$
(22
)
 
$
24,647

Commercial paper
3,998

 
—

 
(1
)
 
3,997

Certificates of deposit
4,252

 
2

 
—

 
4,254

Current marketable securities
32,918

 
3

 
(23
)
 
32,898

Non-current marketable securities:
 
 
 
 
 
 
 
Corporate bonds
2,051

 
—

 
(4
)
 
2,047

Certificates of deposit
9,502

 
14

 
(22
)
 
9,494

Non-current marketable securities
11,553

 
14

 
(26
)
 
11,541

Total marketable securities
$
44,471

 
$
17

 
$
(49
)
 
$
44,439

(1)
Included in amortized cost and fair value is purchased and accrued interest of $629.
6. MARKETABLE SECURITIES (CONTINUED)
The following tables show the fair values and gross unrealized losses of our available-for-sale securities that have been in a continuous unrealized loss position deemed to be temporary, aggregated by investment category (in thousands):
 
September 30, 2015
 
Less than 12 Months
 
More than 12 Months
 
Fair Value
 
Unrealized Losses
 
Fair Value
 
Unrealized Losses
Corporate bonds
$
33,664

 
$
(52
)
 
$
—

 
$
—

Commercial paper
5,987

 
(1
)
 
—

 
—

Certificates of deposit
4,244

 
(6
)
 
499

 
(1
)
Government municipal bonds
3,159

 
(3
)
 
—

 
—

Total
$
47,054

 
$
(62
)
 
$
499

 
$
(1
)

 
September 30, 2014
 
Less than 12 Months
 
More than 12 Months
 
Fair Value
 
Unrealized Losses
 
Fair Value
 
Unrealized Losses
Corporate bonds
$
23,475

 
$
(26
)
 
$
—

 
$
—

Commercial paper
3,998

 
(1
)
 
—

 
—

Certificates of deposit
2,980

 
(20
)
 
748

 
(2
)
Total
$
30,453

 
$
(47
)
 
$
748

 
$
(2
)