Investments (Tables)
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9 Months Ended |
Oct. 31, 2017 |
Investments, Debt and Equity Securities [Abstract] |
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Schedule of Marketable Securities |
At October 31, 2017, marketable securities consisted of the following (in thousands): | | | | | | | | | | | | | | | | | Investments classified as Marketable Securities | Amortized Cost | | Unrealized Gains | | Unrealized Losses | | Fair Value | Corporate notes and obligations | $ | 939,959 |
| | $ | 2,246 |
| | $ | (2,435 | ) | | $ | 939,770 |
| U.S. treasury securities | 137,172 |
| | 29 |
| | (491 | ) | | 136,710 |
| Mortgage backed obligations | 98,226 |
| | 22 |
| | (532 | ) | | 97,716 |
| Asset backed securities | 202,180 |
| | 96 |
| | (219 | ) | | 202,057 |
| Municipal securities | 56,387 |
| | 81 |
| | (201 | ) | | 56,267 |
| Foreign government obligations | 68,845 |
| | 2 |
| | (524 | ) | | 68,323 |
| U.S. agency obligations | 10,506 |
| | 1 |
| | (9 | ) | | 10,498 |
| Covered bonds | 45,485 |
| | 63 |
| | (61 | ) | | 45,487 |
| Total marketable securities | $ | 1,558,760 |
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| $ | 2,540 |
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| $ | (4,472 | ) |
| $ | 1,556,828 |
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At January 31, 2017, marketable securities consisted of the following (in thousands): | | | | | | | | | | | | | | | | | Investments classified as Marketable Securities | Amortized Cost | | Unrealized Gains | | Unrealized Losses | | Fair Value | Corporate notes and obligations | $ | 321,284 |
| | $ | 887 |
| | $ | (1,531 | ) | | $ | 320,640 |
| U.S. treasury securities | 62,429 |
| | 68 |
| | (674 | ) | | 61,823 |
| Mortgage backed obligations | 74,882 |
| | 39 |
| | (669 | ) | | 74,252 |
| Asset backed securities | 101,913 |
| | 74 |
| | (197 | ) | | 101,790 |
| Municipal securities | 33,523 |
| | 35 |
| | (183 | ) | | 33,375 |
| Foreign government obligations | 10,491 |
| | 3 |
| | (36 | ) | | 10,458 |
| Total marketable securities | $ | 604,522 |
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| $ | 1,106 |
|
| $ | (3,290 | ) |
| $ | 602,338 |
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Schedule of Short-Term and Long-Term Marketable Securities |
The contractual maturities of the investments classified as marketable securities are as follows (in thousands): | | | | | | | | | | As of | | October 31, 2017 | | January 31, 2017 | Due within 1 year | $ | 226,929 |
| | $ | 104,631 |
| Due in 1 year through 5 years | 1,314,352 |
| | 494,127 |
| Due in 5 years through 10 years | 15,547 |
| | 3,580 |
| | $ | 1,556,828 |
| | $ | 602,338 |
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Schedule of Marketable Securities in a Unrealized Loss Position |
As of October 31, 2017, the following marketable securities were in an unrealized loss position (in thousands): | | | | | | | | | | | | | | | | | | | | | | | | | | Less than 12 Months | | 12 Months or Greater | | Total | | Fair Value | | Unrealized Losses | | Fair Value | | Unrealized Losses | | Fair Value | | Unrealized Losses | Corporate notes and obligations | $ | 424,101 |
| | $ | (2,052 | ) | | $ | 28,653 |
| | $ | (383 | ) | | $ | 452,754 |
| | $ | (2,435 | ) | U.S. treasury securities | 114,724 |
| | (491 | ) | | 0 |
| | 0 |
| | 114,724 |
| | (491 | ) | Mortgage backed obligations | 68,841 |
| | (315 | ) | | 16,564 |
| | (217 | ) | | 85,405 |
| | (532 | ) | Asset backed securities | 126,186 |
| | (210 | ) | | 3,461 |
| | (9 | ) | | 129,647 |
| | (219 | ) | Municipal securities | 30,671 |
| | (148 | ) | | 2,788 |
| | (53 | ) | | 33,459 |
| | (201 | ) | Foreign government obligations | 62,697 |
| | (520 | ) | | 1,027 |
| | (4 | ) | | 63,724 |
| | (524 | ) | U.S. agency obligations | 6,746 |
| | (9 | ) | | 0 |
| | 0 |
| | 6,746 |
| | (9 | ) | Covered bonds | 5,861 |
| | (61 | ) | | 0 |
| | 0 |
| | 5,861 |
| | (61 | ) | | $ | 839,827 |
| | $ | (3,806 | ) | | $ | 52,493 |
| | $ | (666 | ) | | $ | 892,320 |
| | $ | (4,472 | ) |
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Schedule of Components of Investment Income |
The components of investment income are presented below (in thousands): | | | | | | | | | | | | | | | | | | Three Months Ended October 31, | | Nine Months Ended October 31, | | 2017 | | 2016 | | 2017 | | 2016 | Interest income | $ | 10,038 |
| | $ | 3,642 |
| | $ | 24,433 |
| | $ | 17,961 |
| Realized gains | 258 |
| | 210 |
| | 770 |
| | 7,771 |
| Realized losses | (247 | ) | | (143 | ) | | (1,134 | ) | | (1,985 | ) | Total investment income | $ | 10,049 |
| | $ | 3,709 |
| | $ | 24,069 |
| | $ | 23,747 |
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