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Marketable Securities (Tables) | 6 Months Ended
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Jul. 31, 2015
Amortized Cost, Gross Unrealized Gains (Losses) and Fair Value of Available-For-Sale Securities | The amortized cost, gross unrealized gains (losses) and fair value of available-for-sale securities by major security type and class of security as of July 31, 2015, January 31, 2015 and July 31, 2014 were as follows:
|  | Amortized Cost |  |  | Unrealized Gains |  |  | Unrealized (Losses) |  |  | Fair Value |
As of July 31, 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Municipal and pre-refunded municipal bonds |  | $ | 31,983 |  |  | $ | 43 |  |  | $ | (1 | ) |  | $ | 32,025 |
Corporate bonds |  |  | 37,961 |  |  |  | 1 |  |  |  | (60 | ) |  |  | 37,902 |
Certificates of deposit |  |  | 1,999 |  |  |  | — |  |  |  | — |  |  |  | 1,999 |
|  |  | 71,943 |  |  |  | 44 |  |  |  | (61 | ) |  |  | 71,926 |
Long-term Investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Municipal and pre-refunded municipal bonds |  |  | 45,405 |  |  |  | 110 |  |  |  | (6 | ) |  |  | 45,509 |
Corporate bonds |  |  | 17,835 |  |  |  | 1 |  |  |  | (39 | ) |  |  | 17,797 |
Certificates of deposit |  |  | 4,436 |  |  |  | — |  |  |  | — |  |  |  | 4,436 |
Mutual funds, held in rabbi trust |  |  | 4,964 |  |  |  | 66 |  |  |  | (8 | ) |  |  | 5,022 |
|  |  | 72,640 |  |  |  | 177 |  |  |  | (53 | ) |  |  | 72,764 |
|  | $ | 144,583 |  |  | $ | 221 |  |  | $ | (114 | ) |  | $ | 144,690 |
As of January 31, 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Municipal and pre-refunded municipal bonds |  | $ | 30,509 |  |  | $ | 41 |  |  | $ | (2 | ) |  | $ | 30,548 |
Corporate bonds |  |  | 56,594 |  |  |  | 20 |  |  |  | (24 | ) |  |  | 56,590 |
Certificates of deposit |  |  | 11,127 |  |  |  | 5 |  |  |  | — |  |  |  | 11,132 |
Treasury bills |  |  | 2,033 |  |  |  | 3 |  |  |  | — |  |  |  | 2,036 |
Commercial paper |  |  | 3,938 |  |  |  | 2 |  |  |  | — |  |  |  | 3,940 |
|  |  | 104,201 |  |  |  | 71 |  |  |  | (26 | ) |  |  | 104,246 |
Long-term Investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Municipal and pre-refunded municipal bonds |  |  | 42,840 |  |  |  | 113 |  |  |  | (6 | ) |  |  | 42,947 |
Corporate bonds |  |  | 46,754 |  |  |  | 22 |  |  |  | (40 | ) |  |  | 46,736 |
Certificates of deposit |  |  | 3,066 |  |  |  | — |  |  |  | — |  |  |  | 3,066 |
Mutual funds, held in rabbi trust |  |  | 3,816 |  |  |  | 16 |  |  |  | (54 | ) |  |  | 3,778 |
Treasury bills |  |  | 7,111 |  |  |  | 9 |  |  |  | — |  |  |  | 7,120 |
Federal government agencies |  |  | 799 |  |  |  | 2 |  |  |  | — |  |  |  | 801 |
|  |  | 104,386 |  |  |  | 162 |  |  |  | (100 | ) |  |  | 104,448 |
|  | $ | 208,587 |  |  | $ | 233 |  |  | $ | (126 | ) |  | $ | 208,694 |
As of July 31, 2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Municipal and pre-refunded municipal bonds |  | $ | 29,022 |  |  | $ | 29 |  |  | $ | (1 | ) |  | $ | 29,050 |
Corporate bonds |  |  | 55,849 |  |  |  | 50 |  |  |  | (15 | ) |  |  | 55,884 |
Certificates of deposit |  |  | 14,348 |  |  |  | 9 |  |  |  | — |  |  |  | 14,357 |
Treasury bills |  |  | 4,530 |  |  |  | 4 |  |  |  | — |  |  |  | 4,534 |
Commercial paper |  |  | 2,892 |  |  |  | 4 |  |  |  | — |  |  |  | 2,896 |
|  |  | 106,641 |  |  |  | 96 |  |  |  | (16 | ) |  |  | 106,721 |
Long-term Investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Municipal and pre-refunded municipal bonds |  |  | 45,387 |  |  |  | 107 |  |  |  | (18 | ) |  |  | 45,476 |
Corporate bonds |  |  | 93,086 |  |  |  | 96 |  |  |  | (143 | ) |  |  | 93,039 |
Certificates of deposit |  |  | 2,493 |  |  |  | — |  |  |  | — |  |  |  | 2,493 |
Mutual funds, held in rabbi trust |  |  | 3,026 |  |  |  | 68 |  |  |  | (5 | ) |  |  | 3,089 |
Treasury bills |  |  | 11,264 |  |  |  | 5 |  |  |  | — |  |  |  | 11,269 |
Federal government agencies |  |  | 1,777 |  |  |  | 3 |  |  |  | — |  |  |  | 1,780 |
|  |  | 157,033 |  |  |  | 279 |  |  |  | (166 | ) |  |  | 157,146 |
|  | $ | 263,674 |  |  | $ | 375 |  |  | $ | (182 | ) |  | $ | 263,867 |

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- Definition Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27198-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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