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Marketable Securities (Tables)
6 Months Ended
Mar. 31, 2015
Marketable Securities [Abstract]  
Schedule of Marketable Securities
At March 31, 2015 our marketable securities were (in thousands):
 
Amortized
Cost (1)
 
Unrealized
Gains
 
Unrealized
Losses
 
Fair Value (1)
Current marketable securities:
 
 
 
 
 
 
 
Corporate bonds
$
30,255

 
$

 
$
(41
)
 
$
30,214

Commercial paper
2,000

 

 

 
2,000

Certificates of deposit
7,002

 
7

 
(3
)
 
7,006

Current marketable securities
39,257

 
7

 
(44
)
 
39,220

Non-current marketable securities:
 
 
 
 
 
 
 
Corporate bonds
3,048

 

 
(10
)
 
3,038

Certificates of deposit
4,502

 
12

 
(2
)
 
4,512

Non-current marketable securities
7,550

 
12

 
(12
)
 
7,550

Total marketable securities
$
46,807

 
$
19

 
$
(56
)
 
$
46,770

(1)
Included in amortized cost and fair value is purchased and accrued interest of $155.

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.
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 marketable securities that have been in a continuous unrealized loss position deemed to be temporary, aggregated by investment category (in thousands):
 
March 31, 2015
 
Less than 12 Months
 
More than 12 Months
 
Fair Value
 
Unrealized Losses
 
Fair Value
 
Unrealized Losses
Corporate bonds
$
33,101

 
$
(51
)
 
$

 
$

Certificates of deposit
3,995

 
(5
)
 

 

Total
$
37,096

 
$
(56
)
 
$

 
$

 
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
)