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Marketable Securities (Tables)
 12 Months Ended
Sep. 30, 2013
Marketable Securities [Abstract]  
Schedule of Marketable Securities
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.
At September 30, 2012 our marketable securities were (in thousands):
 
Amortized
Cost (1)
 
Unrealized
Gains
 
Unrealized
Losses
 
Fair Value (1)
Current marketable securities:
 
 
 
 
 
 
 
Corporate bonds
$
39,306

 
$
14

 
$
(19
)
 
$
39,301

Commercial paper
2,000

 
—

 
—

 
2,000

Certificates of deposit
7,262

 
—

 
(4
)
 
7,258

Government municipal bonds
9,814

 
1

 
(2
)
 
9,813

Current marketable securities
58,382

 
15

 
(25
)
 
58,372

Non-current marketable securities:
 
 
 
 
 
 
 
Corporate bonds
2,019

 
—

 
(3
)
 
2,016

Total marketable securities
$
60,401

 
$
15

 
$
(28
)
 
$
60,388

(1)
Included in amortized cost and fair value is purchased and accrued interest of $485.
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, 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
)

 
September 30, 2012
 
Less than 12 Months
 
More than 12 Months
 
Fair Value
 
Unrealized Losses
 
Fair Value
 
Unrealized Losses
Corporate bonds
$
6,246

 
$
(22
)
 
$
—

 
$
—

Commercial paper
2,000

 
—

 
—

 
—

Certificates of deposit
5,114

 
(4
)
 
—

 
—

Government municipal bonds
21,143

 
(2
)
 
—

 
—

Total
$
34,503

 
$
(28
)
 
$
—

 
$
—