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Share-Based Compensation Plans (Details) $ / shares in Units, $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Apr. 22, 2014 $ / shares | Aug. 24, 2008 shares | Feb. 28, 2017 USD ($) item $ / shares shares | Feb. 29, 2016 USD ($) $ / shares shares | Feb. 28, 2015 USD ($) $ / shares shares | Feb. 28, 2014 shares
Share-based compensation plans |  |  |  |  |  |
Number of active share-based compensation plans | item |  |  | 3 |  |  |
Range of expected terms used |  |  | 4 years 1 month 6 days |  |  |
Range of risk free interest rates used, minimum (as a percent) |  |  |  | 0.90% | 1.20% |
Range of risk free interest rates used, maximum (as a percent) |  |  |  | 1.50% | 1.50% |
Expected dividend rate (as a percent) |  |  | 0.00% | 0.00% | 0.00% |
Range of expected volatility rates used, minimum (as a percent) |  |  |  | 35.90% | 35.30% |
Range of expected volatility rates used, maximum (as a percent) |  |  |  | 39.70% | 50.50% |
SHARE-BASED PAYMENT EXPENSE |  |  |  |  |  |
Less income tax benefits | $ |  |  | $ (2,396) | $ (1,284) | $ (661) |
Share-based payment expense, net of income tax benefits | $ |  |  | $ 13,310 | $ 7,407 | $ 5,557 |
Earnings per share impact of share-based payment expense: |  |  |  |  |  |
Basic (in dollars per share) | $ / shares |  |  | $ 0.48 | $ 0.26 | $ 0.19 |
Diluted (in dollars per share) | $ / shares |  |  | $ 0.48 | $ 0.26 | $ 0.19 |
1998 Plan |  |  |  |  |  |
Share-based compensation plans |  |  |  |  |  |
Number of shares of common stock covered for issuance under share-based compensation plan |  | 6,750,000 |  |  |  |
Restricted stock disclosure |  |  |  |  |  |
Shares originally authorized |  | 6,750,000 |  |  |  |
2008 Stock Incentive Plan |  |  |  |  |  |
Share-based compensation plans |  |  |  |  |  |
Number of shares of common stock covered for issuance under share-based compensation plan |  |  | 3,750,000 |  |  |
Restricted stock disclosure |  |  |  |  |  |
Shares originally authorized |  |  | 3,750,000 |  |  |
Less cumulative stock option grants issued, net of forfeitures |  |  | (1,182,894) |  |  |
Less restricted share awards previously vested and settled |  |  | (439,613) |  |  |
Subtotal |  |  | 2,127,493 |  |  |
Less maximum RSU's issuable upon vesting |  |  | (123,425) |  |  |
Less estimated maximum PSU's issuable upon vesting |  |  | (396,312) |  |  |
Shares available for issuance |  |  | 1,607,756 |  |  |
Number of shares available for future issue under the plan |  |  | 1,607,756 |  |  |
2008 Directors Plan |  |  |  |  |  |
Share-based compensation plans |  |  |  |  |  |
Number of shares of common stock covered for issuance under share-based compensation plan |  |  | 175,000 |  |  |
Restricted stock disclosure |  |  |  |  |  |
Shares originally authorized |  |  | 175,000 |  |  |
Shares available for issuance |  |  | 96,175 |  |  |
Number of shares available for future issue under the plan |  |  | 96,175 |  |  |
SG&A |  |  |  |  |  |
SHARE-BASED PAYMENT EXPENSE |  |  |  |  |  |
Share-based payment expense | $ |  |  | $ 15,706 | $ 8,691 | $ 6,218 |
Minimum |  |  |  |  |  |
Share-based compensation plans |  |  |  |  |  |
Range of expected terms used |  |  |  | 4 years 1 month 6 days | 4 years 1 month 6 days |
Maximum |  |  |  |  |  |
Share-based compensation plans |  |  |  |  |  |
Range of expected terms used |  |  |  | 4 years 4 months 24 days | 4 years 4 months 24 days |
Restricted stock (RSA) | 2008 Stock Incentive Plan |  |  |  |  |  |
Share-based compensation plans |  |  |  |  |  |
Grant date fair value (in dollars per share) | $ / shares |  |  |  | $ 89.12 | $ 67.10 |
Vested and settled or exercised, Vested and settled (in shares) |  |  |  | 2,000 | 62,000 |
Restricted stock (RSA) | 2008 Directors Plan |  |  |  |  |  |
Share-based compensation plans |  |  |  |  |  |
Number of awards granted (in shares) |  |  | 5,285 | 5,649 | 9,267 |
Grant date fair value (in dollars per share) | $ / shares |  |  | $ 92.98 | $ 87.04 | $ 61.72 |
Restricted stock disclosure |  |  |  |  |  |
Shares, Issued |  |  | 78,825 |  |  |
Restricted stock (RSA) | Former Chief Executive Officer | 2008 Stock Incentive Plan |  |  |  |  |  |
Share-based compensation plans |  |  |  |  |  |
Vested and settled or exercised, Vested and settled (in shares) |  |  |  |  |  | 62,304
Vested and settled or exercised, fair value (in dollars per share) | $ / shares |  |  | $ 67.10 |  |  |
Restricted stock (RSA) | CEO | 2008 Stock Incentive Plan |  |  |  |  |  |
Share-based compensation plans |  |  |  |  |  |
Options granted (in shares) |  |  |  | 2,000 |  |
Fair value for grants (in dollars per share) | $ / shares |  |  |  | $ 89.12 |  |
Share-based compensation. | Directors | SG&A |  |  |  |  |  |
SHARE-BASED PAYMENT EXPENSE |  |  |  |  |  |
Share-based payment expense | $ |  |  | $ 700 | $ 700 | $ 816 |
Performance-based and other stock awards | SG&A |  |  |  |  |  |
SHARE-BASED PAYMENT EXPENSE |  |  |  |  |  |
Share-based payment expense | $ |  |  | $ 11,812 | $ 4,478 | $ 1,732 |
Employee stock purchase plan |  |  |  |  |  |
Share-based compensation plans |  |  |  |  |  |
Number of shares of common stock covered for issuance under share-based compensation plan |  |  | 350,000 |  |  |
Shares of common stock acquired by plan participants |  |  | 32,110 | 28,433 | 31,128 |
Restricted stock disclosure |  |  |  |  |  |
Shares originally authorized |  |  | 350,000 |  |  |
Shares available for issuance |  |  | 66,542 |  |  |
Maximum withholding percentage of employee wages or salaries for the purchase of shares of common stock |  |  | 15.00% |  |  |
Purchase price for shares acquired under the plan as a percentage of the share's fair market value |  |  | 85.00% |  |  |
Price of common stock acquired by plan participants (in dollars per share) | $ / shares |  |  | $ 76.77 | $ 67.77 | $ 49.49 |
Number of shares available for future issue under the plan |  |  | 66,542 |  |  |
Employee stock purchase plan | SG&A |  |  |  |  |  |
SHARE-BASED PAYMENT EXPENSE |  |  |  |  |  |
Share-based payment expense | $ |  |  | $ 580 | $ 552 | $ 391 |
Stock Option Officers Employees and Consultants |  |  |  |  |  |
Share-based compensation plans |  |  |  |  |  |
Options granted (in shares) |  |  | 2,000 | 186,000 | 257,000 |
Fair value for grants (in dollars per share) | $ / shares |  |  | $ 28.74 | $ 28.82 | $ 25.22 |
Range of risk free interest rates used, minimum (as a percent) |  |  | 1.20% | 0.90% | 1.20% |
Range of risk free interest rates used, maximum (as a percent) |  |  | 1.20% | 1.50% | 1.50% |
Expected dividend rate (as a percent) |  |  | 0.00% | 0.00% | 0.00% |
Range of expected volatility rates used, minimum (as a percent) |  |  | 33.40% | 35.90% | 35.30% |
Range of expected volatility rates used, maximum (as a percent) |  |  | 33.40% | 39.70% | 50.50% |
Exercise of stock options (in shares) |  |  | 170,000 | 178,000 | 187,000 |
Options outstanding |  |  | 448,000 | 649,000 | 768,000 | 839,000
Stock Option Officers Employees and Consultants | 2008 Stock Incentive Plan |  |  |  |  |  |
Share-based compensation plans |  |  |  |  |  |
Options outstanding |  |  | 447,137 |  |  |
Stock Option Officers Employees and Consultants | SG&A |  |  |  |  |  |
SHARE-BASED PAYMENT EXPENSE |  |  |  |  |  |
Share-based payment expense | $ |  |  | $ 2,614 | $ 2,961 | $ 3,279 |
Stock Option Officers Employees and Consultants | Minimum |  |  |  |  |  |
Share-based compensation plans |  |  |  |  |  |
Range of expected terms used |  |  | 4 years 1 month 6 days | 4 years 1 month 6 days | 4 years 1 month 6 days |
Stock Option Officers Employees and Consultants | Minimum | 2008 Stock Incentive Plan |  |  |  |  |  |
Share-based compensation plans |  |  |  |  |  |
Vesting period |  |  | 4 years |  |  |
Term of award |  |  | 7 years |  |  |
Restricted stock disclosure |  |  |  |  |  |
Vesting period |  |  | 4 years |  |  |
Stock Option Officers Employees and Consultants | Maximum |  |  |  |  |  |
Share-based compensation plans |  |  |  |  |  |
Range of expected terms used |  |  | 4 years 1 month 6 days | 4 years 4 months 24 days | 4 years 4 months 24 days |
Stock Option Officers Employees and Consultants | Maximum | 2008 Stock Incentive Plan |  |  |  |  |  |
Share-based compensation plans |  |  |  |  |  |
Vesting period |  |  | 5 years |  |  |
Term of award |  |  | 10 years |  |  |
Restricted stock disclosure |  |  |  |  |  |
Vesting period |  |  | 5 years |  |  |
Stock Option Officers Employees and Consultants | Certain officers and employees | 1998 Plan |  |  |  |  |  |
Share-based compensation plans |  |  |  |  |  |
Options outstanding |  |  | 1,200 |  |  |
Stock Option Officers Employees and Consultants | Certain officers and employees | Minimum | 1998 Plan |  |  |  |  |  |
Share-based compensation plans |  |  |  |  |  |
Vesting period |  | 4 years |  |  |  |
Term of award |  | 7 years |  |  |  |
Restricted stock disclosure |  |  |  |  |  |
Vesting period |  | 4 years |  |  |  |
Stock Option Officers Employees and Consultants | Certain officers and employees | Maximum | 1998 Plan |  |  |  |  |  |
Share-based compensation plans |  |  |  |  |  |
Vesting period |  | 5 years |  |  |  |
Term of award |  | 10 years |  |  |  |
Restricted stock disclosure |  |  |  |  |  |
Vesting period |  | 5 years |  |  |  |
Restricted Stock Units (RSU) |  |  |  |  |  |
Share-based compensation plans |  |  |  |  |  |
Number of awards granted (in shares) |  |  | 162,000 | 95,000 | 118,000 |
Grant date fair value (in dollars per share) | $ / shares |  |  | $ 96.90 | $ 76.62 | $ 58.35 |
Vested and settled or exercised, Vested and settled (in shares) |  |  | 15,643 |  | 100,000 |
Vested and settled or exercised, fair value (in dollars per share) | $ / shares |  |  | $ 60.28 |  | $ 32.88 |
Restricted Stock Units (RSU) | CEO and certain members of management team | 2008 Stock Incentive Plan |  |  |  |  |  |
Share-based compensation plans |  |  |  |  |  |
Number of awards granted (in shares) |  |  | 92,329 | 29,932 | 28,937 |
Grant date fair value (in dollars per share) | $ / shares |  |  | $ 96.74 | $ 76.62 | $ 58.36 |
Restricted Stock Units (RSU) | CEO and certain members of management team | Maximum | 2008 Stock Incentive Plan |  |  |  |  |  |
Share-based compensation plans |  |  |  |  |  |
Vesting period |  |  | 4 years |  |  |
Restricted stock disclosure |  |  |  |  |  |
Vesting period |  |  | 4 years |  |  |
Performance Restricted Stock Units (PSU) | 2008 Stock Incentive Plan |  |  |  |  |  |
Share-based compensation plans |  |  |  |  |  |
Number of awards granted (in shares) |  |  | 139,846 | 130,608 | 178,101 |
Grant date fair value (in dollars per share) | $ / shares |  |  | $ 97.12 | $ 76.62 | $ 58.36 |
Vested and settled or exercised, fair value (in dollars per share) | $ / shares | $ 67.10 |  |  |  |  |
Restricted stock disclosure |  |  |  |  |  |
Performance period (in years) |  |  | 3 years |  |  |

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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested and settled during the reporting period. + References No definition available. + Details
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- Definition Represents the Sharebased compensation arrangement by sharebased payment award estimated maximum RSU upon potentially issuable upon vesting + References No definition available. + Details
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- Definition Represents the number of shares authorized less cumulative stock options grants issued and restricted share awards previously vested and settled. + References No definition available. + Details
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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 S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&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 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: 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 + Details
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- Definition The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period. + 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 (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, 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 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + 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 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued 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 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + 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)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + 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)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + 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 + 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 The minimum 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 Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The highest percentage of annual salary that an employee is permitted to utilize with respect to the 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 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + 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 (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + 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 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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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average of per share prices paid for shares purchased on the open market for issuance to employees under the 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 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 + 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 50 -Paragraph 2 -Subparagraph (f)(2)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: 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=27013229&loc=d3e301413-122809 + Details
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- Definition Number of shares of stock issued as of the balance sheet date, including shares that had been issued and were previously outstanding but which are now held in the treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 + Details
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