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SHARE-BASED COMPENSATION: (Tables)
12 Months Ended
Nov. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of share-based compensation expense
The Company recorded share-based compensation expense in the consolidated statements of operations for fiscal years 2016, 2015 and 2014 as follows: 
 
Fiscal Years Ended November 30,
 
2016
 
2015
 
2014
Cost of revenue
$
43

 
$
571

 
$
646

Selling, general and administrative expenses
13,980

 
13,133

 
13,430

Total share-based compensation
14,023

 
13,704

 
14,076

Tax effect on share-based compensation
(4,768
)
 
(4,967
)
 
(5,156
)
Net effect on net income
$
9,255

 
$
8,737

 
$
8,920

Schedule of assumptions used in Black-Scholes valuation model
The following assumptions were used in the Black-Scholes valuation model in fiscal years 2016, 2015 and 2014: 
 
Fiscal Years Ended November 30,
 
2016
 
2015
 
2014
Stock option plan:
 
 
 
 
 
Expected life (years)
5.8

 
5.9

 
5.5

Risk free interest rate
1.43
%
 
1.63
%
 
1.74
%
Expected volatility
31.44
%
 
31.78
%
 
33.40
%
Dividend yield
0.89
%
 
0.90
%
 
0.80
%
Employee stock purchase plan:

 

 

Expected life (years)
0.3

 
0.3

 
0.3

Risk free interest rate
0.22% - 0.32%

 
0.00% - 0.03%

 
0.02%-0.07%

Expected volatility
28.13% - 29.87%

 
29.68% - 38.63%

 
28.39% - 37.40%

Dividend yield
0.21% - 0.23%

 
0.16% - 0.24%

 
0.00% - 0.02%

Schedule of activity under stock option plans
A summary of the activities under the Company’s stock incentive plan is set forth below:
 
Shares Available
for Grant
 
Options Outstanding
Number of
Shares
 
Weighted-Average
Exercise Price
Per Share
Balances, November 30, 2015
1,968

 
657

 
$
43.50

Restricted stock awards granted
(140
)
 

 

Restricted stock units granted
(103
)
 

 

Restricted stock cancelled/forfeited
71

 

 

Options granted
(100
)
 
100

 
$
112.08

Options exercised

 
(186
)
 
$
27.80

Balances, November 30, 2016
1,696

 
571

 
$
60.64

Schedule of cash received from exercise of options and intrinsic values of options exercised
The cash received from the exercise of options and the intrinsic values of options exercised during fiscal years 2016, 2015 and 2014 were as follows:
 
Fiscal Years Ended November 30,
 
2016
 
2015
 
2014
Intrinsic value of options exercised
$
11,918

 
$
9,338

 
$
11,500

Cash received from exercise of options
$
5,157

 
$
3,984

 
$
5,873

Schedule of non-vested restricted stock awards and stock units
A summary of the changes in the Company’s nonvested restricted stock awards and stock units during the fiscal year 2016 is presented below:
 
Number of
shares
 
Weighted-average,
grant-date
fair value per share
Nonvested as of November 30, 2015
719
 
$58.36
Awards granted
140
 
$109.45
Units granted(1)
103
 
$86.57
Awards and units vested
(251)
 
$49.06
Awards and units cancelled/forfeited(2)
(71)
 
$54.66
Nonvested as of November 30, 2016
640
 
$79.65
 
_____________________________________
(1)
For performance-based restricted stock units, the maximum number of shares that can be awarded upon full vesting of the grants is included.
(2)
For performance-based restricted stock units, the difference between maximum awards and the actual number of shares issued upon full vesting is included.