| Summary of Marketable Securities |
At October 31, 2012, marketable securities consisted of the following (in thousands):
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |
|
Amortized
Cost |
|
|
Unrealized
Gains |
|
|
Unrealized Losses |
|
|
Aggregate
Fair Value |
|
|
U.S. agency obligations
|
|
$ |
608,658 |
|
|
$ |
22 |
|
|
$ |
(5 |
) |
|
$ |
608,675 |
|
|
U.S. treasury securities
|
|
|
70,147 |
|
|
|
— |
|
|
|
(1 |
) |
|
|
70,146 |
|
|
Commercial paper
|
|
|
42,697 |
|
|
|
— |
|
|
|
— |
|
|
|
42,697 |
|
|
Certificates of deposit
|
|
|
250 |
|
|
|
— |
|
|
|
— |
|
|
|
250 |
|
|
U.S. corporate securities
|
|
|
12,026 |
|
|
|
2 |
|
|
|
(1 |
) |
|
|
12,027 |
|
|
Municipal securities
|
|
|
1,361 |
|
|
|
— |
|
|
|
(1 |
) |
|
|
1,360 |
|
|
Money market funds
|
|
|
51,047 |
|
|
|
— |
|
|
|
— |
|
|
|
51,047 |
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |
|
$ |
786,186 |
|
|
$ |
24 |
|
|
$ |
(8 |
) |
|
$ |
786,202 |
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Included in cash and cash equivalents
|
|
$ |
431,805 |
|
|
$ |
2 |
|
|
$ |
(2 |
) |
|
$ |
431,805 |
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Included in marketable securities
|
|
$ |
354,381 |
|
|
$ |
22 |
|
|
$ |
(6 |
) |
|
$ |
354,397 |
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
At January 31, 2012, marketable
securities consisted of the following (in thousands):
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |
|
Amortized
Cost |
|
|
Unrealized
Gains |
|
|
Unrealized Losses |
|
|
Aggregate
Fair Value |
|
|
U.S. agency obligations
|
|
$ |
14,316 |
|
|
$ |
— |
|
|
$ |
— |
|
|
$ |
14,316 |
|
|
Commercial paper
|
|
|
23,785 |
|
|
|
1 |
|
|
|
(1 |
) |
|
|
23,785 |
|
|
U.S. corporate securities
|
|
|
20,391 |
|
|
|
— |
|
|
|
(11 |
) |
|
|
20,380 |
|
|
Municipal securities
|
|
|
15,125 |
|
|
|
1 |
|
|
|
(1 |
) |
|
|
15,125 |
|
|
Money market funds
|
|
|
27,152 |
|
|
|
— |
|
|
|
— |
|
|
|
27,152 |
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |
|
$ |
100,769 |
|
|
$ |
2 |
|
|
$ |
(13 |
) |
|
$ |
100,758 |
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Included in cash and cash equivalents
|
|
$ |
47,125 |
|
|
$ |
— |
|
|
$ |
(1 |
) |
|
$ |
47,124 |
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Included in marketable securities
|
|
$ |
53,644 |
|
|
$ |
2 |
|
|
$ |
(12 |
) |
|
$ |
53,634 |
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|