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Marketable Securities (Tables)
 3 Months Ended
Dec. 31, 2012
Marketable Securities [Abstract]  
Schedule of Marketable Securities
At December 31, 2012 our marketable securities were (in thousands):
 
Amortized
Cost (1)
 
Unrealized
Gains
 
Unrealized
Losses (2)
 
Fair Value (1)
Current marketable securities:
 
 
 
 
 
 
 
Corporate bonds
$
31,486

 
$
6

 
$
(6
)
 
$
31,486

Commercial paper
1,999

 
—

 
(2
)
 
1,997

Certificates of deposit
5,760

 
—

 
(1
)
 
5,759

Government municipal bonds
10,272

 
—

 
(2
)
 
10,270

Current marketable securities
49,517

 
6

 
(11
)
 
49,512

Non-current marketable securities:
 
 
 
 
 
 
 
Corporate bonds
1,940

 
—

 
(5
)
 
1,935

Government municipal bonds
1,344

 
—

 
(1
)
 
1,343

Non-current marketable securities
3,284

 
—

 
(6
)
 
3,278

Total marketable securities
$
52,801

 
$
6

 
$
(17
)
 
$
52,790

(1)
Included in amortized cost and fair value is purchased and accrued interest of $422.
(2)
The aggregate related fair value of securities with unrealized losses as of December 31, 2012 was $33,589. These investments have been in an unrealized loss position for less than twelve months.
5. MARKETABLE SECURITIES (CONTINUED)
At September 30, 2012 our marketable securities were (in thousands):
 
Amortized
Cost (1)
 
Unrealized
Gains
 
Unrealized
Losses (2)
 
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.
(2)
The aggregate related fair value of securities with unrealized losses as of September 30, 2012 was $34,503. These investments have been in an unrealized loss position for less than twelve months.