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Marketable Securities (Tables) | 3 Months Ended
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Apr. 30, 2015
Investments Debt And Equity Securities [Abstract] |
Summary of Cash Equivalents and Marketable Securities | The following is a summary of our cash equivalents and marketable securities as of April 30, 2015 (in thousands).
|  | April 30, 2015 |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Estimated |
|  | Cost |  |  | Gain |  |  | Loss |  |  | Fair Value |
Corporate paper |  | $ | 62,496 |  |  | $ | 10 |  |  | $ | (1 | ) |  | $ | 62,505 |
U.S. government agency obligations |  |  | 20,295 |  |  |  | 1 |  |  |  | (1 | ) |  |  | 20,295 |
Corporate debt securities |  |  | 15,518 |  |  |  | 4 |  |  |  | (7 | ) |  |  | 15,515 |
Asset-backed securities |  |  | 15,335 |  |  |  | 1 |  |  |  | (2 | ) |  |  | 15,334 |
U.S. government obligations |  |  | 12,037 |  |  |  | — |  |  |  | (2 | ) |  |  | 12,035 |
|  | $ | 125,681 |  |  | $ | 16 |  |  | $ | (13 | ) |  | $ | 125,684 |
Included in cash and cash equivalents |  | $ | 21,692 |  |  | $ | 3 |  |  | $ | — |  |  | $ | 21,695 |
Included in marketable investments |  | $ | 103,989 |  |  | $ | 13 |  |  | $ | (13 | ) |  | $ | 103,989 |
Amortized Cost and Estimated Fair Value of Cash Equivalents and Marketable Securities by Contractual Maturity | The amortized cost and estimated fair value of our cash equivalents and marketable securities as of April 30, 2015 are shown below by contractual maturity (in thousands).
|  | April 30, 2015 |
|  | Amortized |  |  | Estimated |
|  | Cost |  |  | Fair Value |
Less than one year |  | $ | 112,196 |  |  | $ | 112,200 |
Due in one to five years |  |  | 13,485 |  |  |  | 13,484 |
|  | $ | 125,681 |  |  | $ | 125,684 |

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- Definition Tabular disclosure of marketable securities. This may consist of investments in certain debt and equity securities, short-term investments and other assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49167202&loc=d3e26610-111562 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=49167202&loc=d3e26626-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2,12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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