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FINANCIAL INSTRUMENTS AND RISK MANAGEMENT (Details 5) (USD $) |  |  |  |  |  |  | 12 Months Ended |  |  |  |  | 12 Months Ended |  |  | 12 Months Ended | 1 Months Ended | 12 Months Ended |  |  | 12 Months Ended |
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Feb. 29, 2012 | Feb. 28, 2011 | Feb. 28, 2010 | Feb. 28, 2009 | Feb. 29, 2012 Cash, interest and non-interest-bearing accounts - unrestricted | Feb. 28, 2011 Cash, interest and non-interest-bearing accounts - unrestricted | Feb. 29, 2012 Cash, interest and non-interest-bearing accounts - unrestricted Minimum | Feb. 28, 2011 Cash, interest and non-interest-bearing accounts - unrestricted Minimum | Feb. 29, 2012 Cash, interest and non-interest-bearing accounts - unrestricted Maximum | Feb. 28, 2011 Cash, interest and non-interest-bearing accounts - unrestricted Maximum | Feb. 29, 2012 Cash, interest and non-interest-bearing accounts - restricted | Feb. 28, 2011 Cash, interest and non-interest-bearing accounts - restricted | Feb. 29, 2012 Cash, interest and non-interest-bearing accounts - restricted Venezuela | Feb. 28, 2011 Cash, interest and non-interest-bearing accounts - restricted Venezuela | Feb. 29, 2012 Cash, interest and non-interest-bearing accounts - restricted Minimum | Feb. 28, 2011 Cash, interest and non-interest-bearing accounts - restricted Minimum | Feb. 29, 2012 Cash, interest and non-interest-bearing accounts - restricted Maximum | Feb. 28, 2011 Cash, interest and non-interest-bearing accounts - restricted Maximum | Feb. 28, 2011 Commercial paper | Feb. 29, 2012 Money market funds | Feb. 28, 2011 Money market funds | Feb. 29, 2012 Money market funds Minimum | Feb. 28, 2011 Money market funds Minimum | Feb. 29, 2012 Money market funds Maximum | Feb. 28, 2011 Money market funds Maximum | Nov. 30, 2011 Auction rate securities | Sep. 30, 2011 Auction rate securities | Feb. 29, 2012 Auction rate securities | Feb. 28, 2011 Auction rate securities | Feb. 29, 2008 Auction rate securities D | Nov. 02, 2011 Auction rate securities | Sep. 15, 2011 Auction rate securities | Feb. 28, 2011 Auction rate securities Minimum D | Feb. 28, 2011 Auction rate securities Maximum D | Feb. 28, 2011 Mutual funds, principally equity based
Cash, cash equivalents and investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
AAA rated and similar investments maximum holding period (in days) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 35 |  |  |  |  |
Cash and cash equivalents | $ 21,846,000 | $ 27,193,000 | $ 110,208,000 | $ 102,675,000 | $ 18,375,000 | $ 16,587,000 |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,560,000 | $ 801,000 | $ 6,435,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash, interest and non-interest-bearing accounts - restricted |  |  |  |  |  |  |  |  |  |  | 2,670,000 | 2,611,000 | 2,670,000 | 2,610,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total cash and cash equivalents | 21,846,000 | 27,193,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20,711,000 |  |  |  |  |  |
Investments |  | 1,233,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,233,000
Total investments |  | 21,944,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  | 0.00% | 0.00% | 1.70% | 1.60% |  |  |  |  | 0.00% | 0.00% | 1.25% | 1.25% | 0.13% |  |  | 0.53% | 0.03% | 4.32% | 3.27% |  |  |  |  |  |  |  | 1.76% | 8.47% |
Interest rate pre-determine intervals in auction process (in days) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7 | 35 |
Cumulative pre-tax unrealized losses on investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,340,000 |  |  |  |  |  |
Cumulative pre-tax unrealized losses on investment, tax effect |  | (460,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (460,000) |  |  |  |  |  |
Investment liquidated at par |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,250,000 | 350,000 |  |  |  |  |  |
Par value of investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 18,800,000 | 18,800,000 |  |  |
Sale price of securities as a percentage of par value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 96.00% | 96.00% |  |  |  |  |  |  |  |
Total selling price, per agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 18,050,000 |  |  |  |  |  |  |  |
Nonoperating pre-tax realized loss |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 750,000 |  |  |  |  |  |  |  |
Nonoperating pre-tax realized loss, tax effect |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 260,000 |  |  |  |  |  |  |  |

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- Definition Financial instruments that are bought and held principally for the purpose of selling them in the near term (thus held for only a short period of time, usually less than one year or the normal operating cycle, whichever is longer) or for debt and equity securities formerly categorized as available-for-sale or held-to-maturity which the entity held as of the date it opted to account for such securities at fair value. An enterprise may also categorize such a security as trading without the intent to sell it in the near term assuming the decision to categorize the security as trading occurred at acquisition. + 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=6871852&loc=d3e26610-111562 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 159 -Paragraph 29 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 13 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 Reference 6: 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) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Implementation Guide (Q and A) -Number FAS115 -Paragraph 35 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 8: 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=6871852&loc=d3e26626-111562 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant