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Marketable Securities (Tables)
 12 Months Ended
Sep. 30, 2015
Marketable Securities [Abstract]  
Schedule of Marketable Securities
At September 30, 2015 our marketable securities were (in thousands):
 
Amortized
Cost (1)
 
Unrealized
Gains
 
Unrealized
Losses
 
Fair Value (1)
Current marketable securities:
 
 
 
 
 
 
 
Corporate bonds
$
31,753

 
$
—

 
$
(39
)
 
$
31,714

Commercial paper
7,986

 
—

 
(1
)
 
7,985

Certificates of deposit
6,253

 
8

 
—

 
6,261

Government municipal bonds
1,232

 
—

 
—

 
1,232

Current marketable securities
47,224

 
8

 
(40
)
 
47,192

Non-current marketable securities:
 
 
 
 
 
 
 
Corporate bonds
4,138

 
—

 
(13
)
 
4,125

Certificates of deposit
7,511

 
3

 
(7
)
 
7,507

Government municipal bonds
1,996

 
—

 
(3
)
 
1,993

Non-current marketable securities
13,645

 
3

 
(23
)
 
13,625

Total marketable securities
$
60,869

 
$
11

 
$
(63
)
 
$
60,817

(1)
Included in amortized cost and fair value is purchased and accrued interest of $252.
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 $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 securities that have been in a continuous unrealized loss position deemed to be temporary, aggregated by investment category (in thousands):
 
September 30, 2015
 
Less than 12 Months
 
More than 12 Months
 
Fair Value
 
Unrealized Losses
 
Fair Value
 
Unrealized Losses
Corporate bonds
$
33,664

 
$
(52
)
 
$
—

 
$
—

Commercial paper
5,987

 
(1
)
 
—

 
—

Certificates of deposit
4,244

 
(6
)
 
499

 
(1
)
Government municipal bonds
3,159

 
(3
)
 
—

 
—

Total
$
47,054

 
$
(62
)
 
$
499

 
$
(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
)