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Marketable Securities (Tables)
 9 Months Ended
Jun. 30, 2012
Marketable Securities [Abstract]  
Schedule of Marketable Securities
At June 30, 2012 our marketable securities were (in thousands):
 
Amortized
Cost (1)
 
Unrealized
Gains
 
Unrealized
Losses (2)
 
Fair Value (1)
Current marketable securities:
 
 
 
 
 
 
 
Corporate bonds
$
43,666

 
$
9

 
$
(54
)
 
$
43,621

Commercial paper
4,997

 
1

 
—

 
4,998

Certificates of deposit
8,012

 
—

 
(5
)
 
8,007

Government municipal bonds
9,652

 
4

 
—

 
9,656

Current marketable securities
66,327

 
14

 
(59
)
 
66,282

Non-current marketable securities:
 
 
 
 
 
 
 
Corporate bonds
1,831

 
—

 
(14
)
 
1,817

Certificates of deposit
500

 
—

 
(1
)
 
499

Government municipal bonds
2,847

 
—

 
(1
)
 
2,846

Non-current marketable securities
5,178

 
—

 
(16
)
 
5,162

Total marketable securities
$
71,505

 
$
14

 
$
(75
)
 
$
71,444

(1)
Included in amortized cost and fair value is purchased and accrued interest of $644.
(2)
The aggregate related fair value of securities with unrealized losses as of June 30, 2012 was $49,846.
5. MARKETABLE SECURITIES (CONTINUED)
At September 30, 2011 our marketable securities were (in thousands):
 
Amortized
Cost (1)
 
Unrealized
Gains
 
Unrealized
Losses (2)
 
Fair Value (1)
Current marketable securities:
 
 
 
 
 
 
 
Corporate bonds
$
22,694

 
$
18

 
$
(144
)
 
$
22,568

Commercial paper
4,998

 
—

 
(3
)
 
4,995

Certificates of deposit
8,775

 
—

 
(9
)
 
8,766

Government municipal bonds
15,200

 
3

 
(8
)
 
15,195

Current marketable securities
51,667

 
21

 
(164
)
 
51,524

Non-current marketable securities:
 
 
 
 
 
 
 
Corporate bonds
1,613

 
—

 
(10
)
 
1,603

Total marketable securities
$
53,280

 
$
21

 
$
(174
)
 
$
53,127

(1)
Included in amortized cost and fair value is purchased and accrued interest of $478.
(2)
The aggregate related fair value of securities with unrealized losses as of September 30, 2011 was $43,755.