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SHARE-BASED COMPENSATION: (Tables)
12 Months Ended
Nov. 30, 2011
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of share-based compensation expense
The Company recorded share-based compensation expense in "Selling, general and administrative expenses" for fiscal years 2011, 2010 and 2009 as follows: 
 
Fiscal Years Ended November 30,
 
2011
 
2010
 
2009
Share-based compensation expense by type of award:
 
 
 
 
 
Employee stock options
$
1,527

 
$
2,759

 
$
2,730

Restricted stock
6,388

 
5,889

 
4,735

Employee stock purchase plan
78

 
77

 
100

Total share-based compensation
7,993

 
8,725

 
7,565

Tax effect on share-based compensation
(2,755
)
 
(3,180
)
 
(2,763
)
Net effect on net income
$
5,238

 
$
5,545

 
$
4,802

Schedule of assumptions used in Black-Scholes valuation model
The following assumptions were used in the Black-Scholes valuation model in fiscal years 2011, 2010 and 2009: 
 
Fiscal Years Ended November 30,
 
2011
 
2010
 
2009
Stock option plan:
 
 
 
 
 
Expected life (years)
5.9

 
5.6

 
5.7

Risk free interest rate
1.11
%
 
1.26
%
 
2.57
%
Expected volatility
41.14
%
 
41.97
%
 
43.55
%
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
%
 
0.16
%
 
0.10
%
Expected volatility
33.15
%
 
32.43
%
 
65.13
%
Dividend yield
0.00
%
 
0.00
%
 
0.00
%
Schedule of activity under stock option plans
A summary of the activity 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, 2008
2,569
 
5,044
 
$11.89
      Restricted stock granted
(211)
 
 
      Restricted stock cancelled/forfeited
32
 
 
      Options granted
(157)
 
157
 
27.31
      Options exercised
 
(1,406)
 
9.41
      Options cancelled/forfeited/expired
66
 
(66)
 
18.11
Balances, November 30, 2009
2,299
 
3,729
 
$13.37
      Restricted stock awards granted
(267)
 
 
      Restricted stock units granted
(100)
 
 
      Restricted stock cancelled/forfeited
38
 
 
      Options granted
(123)
 
123
 
28.52
      Options exercised
 
(1,710)
 
9.93
      Options cancelled/forfeited/expired
22
 
(22)
 
7.14
Balances, November 30, 2010
1,869
 
2,120
 
$17.08
      Restricted stock awards granted
(244)
 
 
      Restricted stock units granted
(10)
 
 
      Restricted stock cancelled/forfeited
25
 
 
      Options granted
(135)
 
135
 
26.98
      Options exercised
 
(531)
 
11.87
      Options cancelled/forfeited/expired
17
 
(17)
 
12.18
Balances, November 30, 2011
1,522
 
1,707
 
$19.52
Schedule of weighted-average grant-date fair value of stock options
The weighted-average grant-date fair value of the stock options granted during fiscal years 2011, 2010 and 2009 was as follows: 
 
Fiscal Years Ended November 30,
 
2011
 
2010
 
2009
Number of options granted
135
 
123
 
157
Weighted-average grant-date fair value per share
$10.68
 
$12.02
 
$11.28
Schedule of options outstanding and exercisable by exercise price ranges
The options outstanding and exercisable as of November 30, 2011 were in the following exercise price ranges:
 
Options Outstanding
 
Options Vested and Exercisable
Range of Exercise Prices per Share
Shares
 
Weighted-
Average
Life (Years)
 
Weighted-
Average
Exercise Price
per Share
 
Shares
 
Weighted-
Average
Life (Years)
 
Weighted-
Average
Exercise Price
per Share
$9.00 - $10.00
61
 
0.83
 
$10.00
 
61
 
0.83
 
$10.00
$12.00 - $15.54
272
 
1.74
 
$12.15
 
272
 
1.74
 
$12.15
$16.10 - $17.17
403
 
3.24
 
$16.50
 
403
 
3.24
 
$16.50
$18.25 - $30.96
971
 
6.82
 
$23.44
 
606
 
5.85
 
$21.82
$9.00 - $30.96
1,707
 
4.95
 
$19.52
 
1,342
 
4.01
 
$17.73
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 2011, 2010 and 2009 were as follows:  
 
Fiscal Years Ended November 30,
 
2011
 
2010
 
2009
Intrinsic value of options exercised
$
9,375

 
$
32,504

 
$
20,839

Cash received from exercise of options
6,290

 
16,980

 
13,221

Schedule of non-vested restricted stock awards and stock units
 
Number of
shares
 
Weighted-average,
grant-date
fair value per share
Nonvested as of November 30, 2008
826
 
$20.25
Awards granted
211
 
30.20
Awards vested
(245)
 
15.30
Awards cancelled/forfeited
(32)
 
20.44
Nonvested as of November 30, 2009
760
 
$24.60
Awards granted
267
 
28.18
Units granted
100
 
29.04
Awards vested
(299)
 
22.21
Awards cancelled/forfeited
(38)
 
24.07
Nonvested as of November 30, 2010
790
 
$25.78
Awards granted
244
 
27.91
Units granted
10
 
32.35
Awards vested
(240)
 
24.51
Awards cancelled/forfeited
(25)
 
26.62
Nonvested as of November 30, 2011
779
 
$23.13