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Marketable Securities | 6 Months Ended
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Jul. 31, 2015
Marketable Securities | 3. Marketable Securities During all periods shown, marketable securities are classified as available-for-sale. 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 |
Proceeds from the sales and maturities of available-for-sale securities were $213,930 and $631,950 for the six months ended July 31, 2015 and 2014, respectively. The Company included in “Other expense, net,” realized gains of $39 and $42 for the three and six months ended July 31, 2015, respectively, and realized gains of $101 and $171 for the three and six months ended July 31, 2014, respectively. Amortization of discounts and premiums, net, resulted in charges of $1,042 and $2,158 for the three and six months ended July 31, 2015, respectively, and $1,499 and $4,106 for the three and six months ended July 31, 2014, respectively. Mutual funds represent assets held in an irrevocable rabbi trust for the Company’s Non-qualified Deferred Compensation Plan (“NQDC”). These assets are a source of funds to match the funding obligations to participants in the NQDC but are subject to the Company’s general creditors. The Company elected the fair value option for financial assets for the mutual funds held in the rabbi trust resulting in all unrealized gains and losses being recorded in “Other expense, net” in the Condensed Consolidated Statements of Income and not as a component of accumulated other comprehensive income (loss).

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- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -Glossary Debt Security -URI http://asc.fasb.org/extlink&oid=6509901 Reference 2: 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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -Glossary Equity Security -URI http://asc.fasb.org/extlink&oid=6511694 Reference 6: 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 7: 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 8: 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 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27405-111563 + Details
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