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Marketable Securities (Tables)
 9 Months Ended
Jun. 30, 2015
Marketable Securities [Abstract]  
Schedule of Marketable Securities
At June 30, 2015 our marketable securities were (in thousands):
 
Amortized
Cost (1)
 
Unrealized
Gains
 
Unrealized
Losses
 
Fair Value (1)
Current marketable securities:
 
 
 
 
 
 
 
Corporate bonds
$
28,065

 
$
—

 
$
(31
)
 
$
28,034

Commercial paper
3,991

 
—

 
(4
)
 
3,987

Certificates of deposit
5,502

 
4

 
—

 
5,506

Current marketable securities
37,558

 
4

 
(35
)
 
37,527

Non-current marketable securities:
 
 
 
 
 
 
 
Corporate bonds
3,723

 
—

 
(14
)
 
3,709

Certificates of deposit
4,504

 
13

 
—

 
4,517

Government municipal bonds
1,246

 
—

 
(1
)
 
1,245

Non-current marketable securities
9,473

 
13

 
(15
)
 
9,471

Total marketable securities
$
47,031

 
$
17

 
$
(50
)
 
$
46,998

(1)
Included in amortized cost and fair value is purchased and accrued interest of $262.

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):
 
June 30, 2015
 
Less than 12 Months
 
More than 12 Months
 
Fair Value
 
Unrealized Losses
 
Fair Value
 
Unrealized Losses
Corporate bonds
$
26,499

 
$
(44
)
 
$
5,002

 
$
(1
)
Commercial paper
1,991

 
(4
)
 
—

 
—

Government municipal bonds
1,230

 
(1
)
 
—

 
—

Total
$
29,720

 
$
(49
)
 
$
5,002

 
$
(1
)
 
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
)