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SHARE-BASED COMPENSATION:
12 Months Ended
Nov. 30, 2013
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 "Selling, general and administrative expenses" for fiscal years 2013, 2012 and 2011 as follows: 
 
Fiscal Years Ended November 30,
 
2013
 
2012
 
2011
Total share-based compensation
$
9,174

 
$
8,445

 
$
7,993

Tax effect on share-based compensation
(3,304
)
 
(3,001
)
 
(2,755
)
Net effect on net income
$
5,870

 
$
5,444

 
$
5,238

 
Valuation Assumptions 
The Company estimates the fair value of share-based payment awards on the date of grant using an option-pricing model. 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 following assumptions were used in the Black-Scholes valuation model in fiscal years 2013, 2012 and 2011: 
 
Fiscal Years Ended November 30,
 
2013
 
2012
 
2011
Stock option plan:
 
 
 
 
 
Expected life (years)
5.6

 
5.8

 
5.9

Risk free interest rate
1.61
%
 
0.70
%
 
1.11
%
Expected volatility
38.71
%
 
39.75
%
 
41.14
%
Dividend yield
0.00
%
 
0.00
%
 
0.00
%
Employee stock purchase plan:

 

 

Expected life (years)
0.3

 
0.3

 
0.3

Risk free interest rate
0.02
%
 
0.09
%
 
0.02
%
Expected volatility
27.96
%
 
26.51
%
 
33.15
%
Dividend yield
0.00
%
 
0.00
%
 
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, 2012
1,128

 
1,343

 
$
21.89

      Restricted stock awards granted
(131
)
 

 

      Restricted stock units granted
(106
)
 

 

      Restricted stock canceled/forfeited
25

 

 

      Options granted
(55
)
 
55

 
$
61.83

      Options exercised

 
(438
)
 
$
16.37

      Options canceled/forfeited/expired
26

 
(26
)
 
$
19.49

Balances, November 30, 2013
887

 
934

 
$
26.88

 
Employee Stock Options 
The weighted-average grant-date fair values of the stock options granted during fiscal years 2013, 2012 and 2011 were $23.62, $12.75, and $10.68, respectively. As of November 30, 2013, 936 options were outstanding and expected to vest with a weighted average life of 5.56 years, a weighted average exercise price of $26.88 per option and an aggregate pre-tax intrinsic value of $36,750. As of November 30, 2013, 688 options were vested and exercisable with a weighted average life of 4.56 years, a weighted average exercise price of $23.19 per share and aggregate pre-tax intrinsic value of $29,579. 
The cash received from the exercise of options and the intrinsic values of options exercised during fiscal years 2013, 2012 and 2011 were as follows:  
 
Fiscal Years Ended November 30,
 
2013
 
2012
 
2011
Intrinsic value of options exercised
$
10,749

 
$
9,653

 
$
9,375

Cash received from exercise of options
7,163

 
8,165

 
6,290


The Company settles employee stock option exercises with newly issued common shares.
As of November 30, 2013, the unamortized share-based compensation expense related to unvested stock options under the Amended and Restated 2003 and 2013 Stock Incentive Plan was $3,645 which will be recognized over an estimated weighted-average amortization period of 3.52 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 2013 is presented below:
 
Number of
shares
 
Weighted-average,
grant-date
fair value per share
Nonvested as of November 30, 2012
811
 
$30.54
Awards Granted
131
 
$54.05
Units granted
106
 
$35.38
Awards vested
(225)
 
$27.91
Awards canceled/forfeited
(25)
 
$31.30
Nonvested as of November 30, 2013
798
 
$35.78
 
As of November 30, 2013, there was $19,149 of total unamortized share-based compensation expense related to nonvested restricted stock awards and stock units granted under the Amended and Restated 2003 and 2013 Stock Incentive Plan. That cost is expected to be recognized over an estimated weighted-average amortization period of 3.31 years.