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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
	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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-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

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant