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Marketable Securities (Tables)
12 Months Ended
Sep. 30, 2014
Marketable Securities [Abstract]  
Schedule of Marketable Securities
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 $213.
At September 30, 2013 our marketable securities were (in thousands):
 
Amortized
Cost (1)
 
Unrealized
Gains
 
Unrealized
Losses
 
Fair Value (1)
Current marketable securities:
 
 
 
 
 
 
 
Corporate bonds
$
35,161

 
$
10

 
$
(30
)
 
$
35,141

Certificates of deposit
1,753

 

 
(2
)
 
1,751

Government municipal bonds
10,115

 

 
(1
)
 
10,114

Current marketable securities
47,029

 
10

 
(33
)
 
47,006

Non-current marketable securities:
 
 
 
 
 
 
 
Corporate bonds
6,439

 

 
(6
)
 
6,433

Certificates of deposit
11,003

 

 
(47
)
 
10,956

Non-current marketable securities
$
17,442

 
$

 
$
(53
)
 
$
17,389

Total marketable securities
$
64,471

 
$
10

 
$
(86
)
 
$
64,395

(1)
Included in amortized cost and fair value is purchased and accrued interest of $629.
Schedule of Unrealized Losses on Available-for-Sale Securities
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, 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
)

7. MARKETABLE SECURITIES (CONTINUED)
 
September 30, 2013
 
Less than 12 Months
 
More than 12 Months
 
Fair Value
 
Unrealized Losses
 
Fair Value
 
Unrealized Losses
Corporate bonds
$
29,911

 
$
(35
)
 
$
2,001

 
$
(1
)
Certificates of deposit
12,451

 
(49
)
 

 

Government municipal bonds
6,182

 
(1
)
 

 

Total
$
48,544

 
$
(85
)
 
$
2,001

 
$
(1
)