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SHARE-BASED COMPENSATION: | 12 Months Ended
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Nov. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Share-based compensation | SHARE-BASED COMPENSATION: The Company recognizes share-based compensation expense for all share-based awards made to employees and directors, including employee stock options, restricted stock awards, restricted stock units and employee stock purchases, based on estimated fair values. The Company recorded share-based compensation expense in the consolidated statements of operations for fiscal years 2015, 2014 and 2013 as follows:
| Fiscal Years Ended November 30,
| 2015 |  | 2014 |  | 2013
Cost of revenue | $ | 571 |  |  | $ | 646 |  |  | $ | — |
Selling, general and administrative expenses | 13,133 |  |  | 13,430 |  |  | 9,174 |
Total share-based compensation | 13,704 |  |  | 14,076 |  |  | 9,174 |
Tax effect on share-based compensation | (4,967 | ) |  | (5,156 | ) |  | (3,304 | )
Net effect on net income | $ | 8,737 |  |  | $ | 8,920 |  |  | $ | 5,870 |
Valuation Assumptions The Company estimates the fair value of share-based payment awards on the date of grant. The value of the portion of the award that is ultimately expected to vest is recognized as expense over the requisite service period in the Company’s financial statements. The Company uses the Black-Scholes valuation model to estimate fair value of stock options. The Black-Scholes option-pricing model was developed for use in estimating the fair value of short-lived exchange traded options that have no vesting restrictions and are fully transferable. In addition, option-pricing models require the input of highly subjective assumptions, including the option’s expected life and the price volatility of the underlying stock. The expected stock price volatility assumption was determined using historical volatility of the Company’s common stock. The fair value of stock awards is determined based on the stock price at the date of grant. For grants that do not accrue dividends or dividend equivalents, the fair value is the stock price reduced by the present value of estimated dividends over the vesting period or performance period. The Company is required to estimate forfeitures and only record compensation costs for those awards that are expected to vest. The assumptions for forfeitures were determined based on type of award and historical experience. Forfeiture assumptions are adjusted at the point in time a significant change is identified, with any adjustment recorded in the period of change, and the final adjustment at the end of the requisite service period to equal actual forfeitures. The following assumptions were used in the Black-Scholes valuation model in fiscal years 2015, 2014 and 2013:
| Fiscal Years Ended November 30,
| 2015 |  | 2014 |  | 2013
Stock option plan: |  |  |  |  |
Expected life (years) | 5.9 |  |  | 5.5 |  |  | 5.6 |
Risk free interest rate | 1.63 | % |  | 1.74 | % |  | 1.61 | %
Expected volatility | 31.78 | % |  | 33.40 | % |  | 38.71 | %
Dividend yield | 0.90 | % |  | 0.80 | % |  | 0.00 | %
Employee stock purchase plan: |  |  |  |  |
Expected life (years) | 0.3 |  |  | 0.3 |  |  | 0.3 |
Risk free interest rate | 0.00% - 0.03% |  |  | 0.02% - 0.07% |  |  | 0.02 | %
Expected volatility | 29.68% - 38.63% |  |  | 28.39% - 37.40% |  |  | 27.96 | %
Dividend yield | 0.16% - 0.24% |  |  | 0.00% - 0.02% |  |  | 0.00 | %
A summary of the activities under the Company’s stock option plan is set forth below:
| Shares Available for Grant |  | Options Outstanding
Number of Shares |  | Weighted-Average Exercise Price Per Share
Balances, November 30, 2014 | 2,146 |  |  | 750 |  |  | $34.17
Restricted stock awards granted | (157 | ) |  | — |  |  | —
Restricted stock units granted | (30 | ) |  | — |  |  | —
Restricted stock cancelled/forfeited | 86 |  |  | — |  |  | —
Options granted | (78 | ) |  | 78 |  |  | $89.21
Options exercised | — |  |  | (170 | ) |  | $23.38
Options cancelled/forfeited/expired | 1 |  |  | (1 | ) |  | $17.17
Balances, November 30, 2015 | 1,968 |  |  | 657 |  |  | $43.50
Employee Stock Options The weighted-average grant-date fair values of the stock options granted during fiscal years 2015, 2014 and 2013 were $26.70, $19.34, and $23.62, respectively. As of November 30, 2015, 657 options were outstanding and expected to vest with a weighted average life of 6.28 years, a weighted average exercise price of $43.50 per option and an aggregate pre-tax intrinsic value of $33,330. As of November 30, 2015, 430 options were vested and exercisable with a weighted average life of 5.00 years, a weighted average exercise price of $31.43 per share and an aggregate pre-tax intrinsic value of $27,009. The cash received from the exercise of options and the intrinsic values of options exercised during fiscal years 2015, 2014 and 2013 were as follows:
| Fiscal Years Ended November 30,
| 2015 |  | 2014 |  | 2013
Intrinsic value of options exercised | $ | 9,338 |  |  | $ | 11,500 |  |  | $ | 10,749 |
Cash received from exercise of options | 3,984 |  |  | 5,873 |  |  | 7,163 |
The Company settles employee stock option exercises with newly issued common shares. As of November 30, 2015, the unamortized share-based compensation expense related to unvested stock options under the 2003 Stock Incentive Plan and 2013 Stock Incentive Plan was $5,015 which will be recognized over an estimated weighted-average amortization period of 3.80 years. Restricted Stock Awards and Restricted Stock Units A summary of the changes in the Company's nonvested restricted stock awards and stock units during the fiscal year 2015 is presented below:
| Number of shares |  | Weighted-average, grant-date fair value per share
Nonvested as of November 30, 2014 | 921 |  | $45.33
Awards granted | 157 |  | $87.44
Units granted | 30 |  | $84.57
Awards and units vested | (303) |  | $41.25
Awards and units cancelled/forfeited | (86) |  | $48.31
Nonvested as of November 30, 2015 | 719 |  | $58.36
As of November 30, 2015, there was $32,756 of total unamortized share-based compensation expense related to nonvested restricted stock awards and stock units granted under the 2003 Stock Incentive Plan and the 2013 Stock Incentive Plan. That cost is expected to be recognized over an estimated weighted-average amortization period of 3.64 years.

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- Definition The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=51659978&loc=d3e25284-112666 Reference 3: 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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5444-113901 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 + Details
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