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Stock-based Compensation
 6 Months Ended
May 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stock-based Compensation [Text Block]
Stock-based Compensation

Stock-based compensation expense for the three and six months ended May 31, 2016 and 2015 was as follows (in thousands):
 
Three months ended May 31,
 
Six months ended May 31,
 
2016
 
2015
 
2016
 
2015
Cost of revenue
$
1,426

 
$
1,444

 
$
2,715

 
$
2,858

Selling, general and administrative
30,668

 
31,282

 
59,475

 
61,741

Total stock-based compensation expense
$
32,094

 
$
32,726

 
$
62,190

 
$
64,599


Total income tax benefits recognized for stock-based compensation arrangements were as follows (in thousands):
 
Three months ended May 31,
 
Six months ended May 31,
 
2016
 
2015
 
2016
 
2015
Income tax benefits
$
10,232

 
$
10,498

 
$
19,810

 
$
20,722


No stock-based compensation cost was capitalized during the three and six months ended May 31, 2016 and 2015.
As of May 31, 2016, there was $138.0 million of unrecognized stock-based compensation cost, adjusted for estimated forfeitures, related to unvested stock-based awards that will be recognized over a weighted-average period of approximately 1.6 years. Total unrecognized stock-based compensation cost will be adjusted for future changes in estimated forfeitures and changes in estimated achievement of performance goals.
Restricted Stock Units (RSUs). The following table summarizes RSU activity during the six months ended May 31, 2016:
 
Shares
 
Weighted-
Average Grant
Date Fair Value
 
(in thousands)
 
 
Balance at November 30, 2015
2,441

 
$
108.74

Granted
540

 
$
105.55

Vested
(881
)
 
$
109.14

Forfeited
(122
)
 
$
114.73

Balance at May 31, 2016
1,978

 
$
107.32


The total fair value of RSUs that vested during the six months ended May 31, 2016 was $90.0 million.