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Fair Value (Tables) | 6 Months Ended
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Jul. 31, 2015
Financial Assets Measured at Fair Value on Recurring Basis | The Company’s financial assets that are accounted for at fair value on a recurring basis are presented in the table below:
|  | Marketable Securities Fair Value as of July 31, 2015 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Municipal and pre-refunded municipal bonds |  | $ | — |  |  | $ | 77,534 |  |  | $ | — |  |  | $ | 77,534 |
Corporate bonds |  |  | 55,699 |  |  |  | — |  |  |  | — |  |  |  | 55,699 |
Certificates of deposit |  |  | — |  |  |  | 6,435 |  |  |  | — |  |  |  | 6,435 |
Mutual funds, held in rabbi trust |  |  | 5,022 |  |  |  | — |  |  |  | — |  |  |  | 5,022 |
|  | $ | 60,721 |  |  | $ | 83,969 |  |  | $ | — |  |  | $ | 144,690 |
|  | Marketable Securities Fair Value as of January 31, 2015 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Municipal and pre-refunded municipal bonds |  | $ | — |  |  | $ | 73,495 |  |  | $ | — |  |  | $ | 73,495 |
Corporate bonds |  |  | 103,326 |  |  |  | — |  |  |  | — |  |  |  | 103,326 |
Certificates of deposit |  |  | — |  |  |  | 14,198 |  |  |  | — |  |  |  | 14,198 |
Mutual funds, held in rabbi trust |  |  | 3,778 |  |  |  | — |  |  |  | — |  |  |  | 3,778 |
Treasury bills |  |  | 9,156 |  |  |  | — |  |  |  | — |  |  |  | 9,156 |
Commercial paper |  |  | — |  |  |  | 3,940 |  |  |  | — |  |  |  | 3,940 |
Federal government agencies |  |  | 801 |  |  |  | — |  |  |  | — |  |  |  | 801 |
|  | $ | 117,061 |  |  | $ | 91,633 |  |  | $ | — |  |  | $ | 208,694 |
|  | Marketable Securities Fair Value as of July 31, 2014 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Assets: |  |  |  |  |  |  |  |
Municipal and pre-refunded municipal bonds |  | $ | — |  |  | $ | 74,526 |  |  | $ | — |  |  | $ | 74,526 |
Corporate bonds |  |  | 148,923 |  |  |  | — |  |  |  | — |  |  |  | 148,923 |
Certificates of deposit |  |  | — |  |  |  | 16,850 |  |  |  | — |  |  |  | 16,850 |
Mutual funds, held in rabbi trust |  |  | 3,089 |  |  |  | — |  |  |  | — |  |  |  | 3,089 |
Treasury bills |  |  | 15,803 |  |  |  | — |  |  |  | — |  |  |  | 15,803 |
Commercial paper |  |  | — |  |  |  | 2,896 |  |  |  | — |  |  |  | 2,896 |
Federal government agencies |  |  | 1,780 |  |  |  | — |  |  |  | — |  |  |  | 1,780 |
|  | $ | 169,595 |  |  | $ | 94,272 |  |  | $ | — |  |  | $ | 263,867 |

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- Definition Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19190-110258 + Details
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