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Marketable Securities (Tables)
 6 Months Ended
Mar. 31, 2014
Marketable Securities [Abstract]  
Schedule of Marketable Securities
At March 31, 2014 our marketable securities were (in thousands):
 
Amortized
Cost (1)
 
Unrealized
Gains
 
Unrealized
Losses
 
Fair Value (1)
Current marketable securities:
 
 
 
 
 
 
 
Corporate bonds
$
36,180

 
$
10

 
$
(24
)
 
$
36,166

Certificates of deposit
2,752

 
—

 
—

 
2,752

Government municipal bonds
6,116

 
1

 
—

 
6,117

Current marketable securities
45,048

 
11

 
(24
)
 
45,035

Non-current marketable securities:
 
 
 
 
 
 
 
Corporate bonds
2,050

 
—

 
(8
)
 
2,042

Certificates of deposit
8,752

 
15

 
(5
)
 
8,762

Non-current marketable securities
10,802

 
15

 
(13
)
 
10,804

Total marketable securities
$
55,850

 
$
26

 
$
(37
)
 
$
55,839

(1)
Included in amortized cost and fair value is purchased and accrued interest of $583.

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 marketable securities that have been in a continuous unrealized loss position deemed to be temporary, aggregated by investment category (in thousands):

 
March 31, 2014
 
Less than 12 Months
 
More than 12 Months
 
Fair Value
 
Unrealized Losses
 
Fair Value
 
Unrealized Losses
Corporate bonds
$
21,587

 
$
(24
)
 
$
10,730

 
$
(8
)
Certificates of deposit
2,998

 
(2
)
 
747

 
(3
)
Total
$
24,585

 
$
(26
)
 
$
11,477

 
$
(11
)

 
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
)