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Share-Based Compensation Plans (Details) (USD $) | 3 Months Ended | 0 Months Ended | 3 Months Ended | 0 Months Ended | 3 Months Ended | 0 Months Ended
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May 31, 2013 item | May 31, 2012 | May 31, 2013 Stock options | May 31, 2012 Stock options | May 31, 2013 Stock options Minimum | May 31, 2013 Stock options Maximum | Mar. 02, 2013 Restricted Stock Award Board members | May 31, 2013 Restricted Stock Award Board members | May 31, 2012 Restricted Stock Award Board members | Apr. 22, 2013 Restricted Stock Award Vesting on February 28, 2015 Chief Executive Officer and President | May 31, 2013 Restricted stock awards and units Performance-based | May 31, 2012 Restricted stock awards and units Performance-based | Apr. 22, 2013 RSUs Performance-based Chief Executive Officer and President | Apr. 22, 2013 RSUs Award date vesting Chief Executive Officer and President | Apr. 22, 2013 RSUs Vesting on February 28, 2014 Chief Executive Officer and President | Apr. 22, 2013 RSUs Vesting on February 28, 2015 Chief Executive Officer and President
Share-Based Compensation Plans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of expired share-based compensation plans | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of active share-based compensation plans | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation plans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted in period (in shares) |  |  | 250,750 |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise prices of grants (in dollars per share) |  |  |  |  | $ 36.03 | $ 38.14 |  |  |  |  |  |  |  |  |  |
Estimated grant date fair value (in dollars per share) |  |  |  |  | $ 10.82 | $ 13.17 |  |  |  |  |  |  |  |  |  |
Term of award |  |  |  |  | 4 years | 5 years |  |  |  |  |  |  |  |  |  |
Expected life |  |  |  |  | 4 years 18 days | 4 years 4 months 6 days |  |  |  |  |  |  |  |  |  |
Range of risk-free interest rates used, minimum (as a percent) |  |  | 0.55% |  |  |  |  |  |  |  |  |  |  |  |  |
Range of risk-free interest rates used, maximum (as a percent) |  |  | 0.63% |  |  |  |  |  |  |  |  |  |  |  |  |
Expected dividend rate (as a percent) |  |  | 0.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Range of expected volatility rates used, minimum (as a percent) |  |  | 37.26% |  |  |  |  |  |  |  |  |  |  |  |  |
Range of expected volatility rates used, maximum (as a percent) |  |  | 41.67% |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock disclosure |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Grant Date Fair Value, Total |  |  |  |  |  |  | $ 140,000 |  |  |  |  |  |  |  |  |
Fair values at the date of grant of awards granted (in dollars per share) |  |  |  |  |  |  | $ 36.56 |  |  | $ 35.55 |  |  | $ 32.88 |  |  |
Number of awards granted (in shares) |  |  |  |  |  |  | 2,628 |  |  | 159,666 |  |  | 100,000 | 33,400 | 33,300 | 33,300
Cash paid in settlement of grant |  |  |  |  |  |  | 40,000 |  |  |  |  |  |  |  |  |
Fair values at the date of grant of awards granted |  |  |  |  |  |  |  |  |  | 5,680,000 |  |  | 3,290,000 |  |  |
Stock options exercised (in shares) |  |  | 107,936 |  |  |  |  |  |  |  |  |  |  |  |  |
SHARE-BASED PAYMENT EXPENSE |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based payment expense | 3,419,000 | 1,602,000 | 589,000 | 547,000 |  |  |  | 137,000 | 123,000 |  | 2,693,000 | 932,000 |  |  |  |
Less income tax benefits | (723,000) | (265,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based payment expense, net of income tax benefits | $ 2,696,000 | $ 1,337,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings per share impact of share-based payment expense: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) | $ 0.08 | $ 0.04 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Diluted (in dollars per share) | $ 0.08 | $ 0.04 |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 64 -Subparagraph b -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 Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=6793087&loc=d3e301413-122809 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph g(1) -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 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(2)(c) -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. + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph e(2)(c) -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. + Details
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- Definition Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.D.2) -URI http://asc.fasb.org/extlink&oid=6793087&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section D -Subsection 2 + Details
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- Definition The estimated measure of the maximum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References No definition available. + Details
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- Definition The estimated measure of the minimum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References No definition available. + Details
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- Definition The maximum risk-free interest rate assumption that is used in valuing an option on its own shares. + References No definition available. + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph c(1) -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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