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Stock-Based Compensation
 6 Months Ended
May 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stock-Based Compensation
Stock-Based Compensation
Stock Options. We estimate the grant-date fair value of stock options using the Black-Scholes option-pricing model. The following table summarizes stock option transactions for the six months ended May 31, 2018:
 
Options
 
Weighted
Average Exercise
Price
Options outstanding at beginning of period
9,265,240

 
$
17.64

Granted
—

 
—

Exercised
(397,062
)
 
12.02

Cancelled
(16,208
)
 
15.47

Options outstanding at end of period
8,851,970

 
$
17.90

Options exercisable at end of period
7,910,570

 
$
18.16


As of May 31, 2018, the weighted average remaining contractual life of stock options outstanding and stock options exercisable was 3.8 years and 3.3 years, respectively. There was $.5 million of total unrecognized compensation expense related to unvested stock option awards as of May 31, 2018 that is expected to be recognized over a weighted average period of 1.0 year. For the three months ended May 31, 2018 and 2017, stock-based compensation expense associated with stock options totaled $.2 million and $.3 million, respectively. For the six months ended May 31, 2018 and 2017, stock-based compensation expense associated with stock options totaled $.4 million and $1.1 million, respectively. The aggregate intrinsic values of stock options outstanding and stock options exercisable were $91.8 million and $81.8 million, respectively, at May 31, 2018. (The intrinsic value of a stock option is the amount by which the market value of a share of the underlying common stock exceeds the exercise price of the stock option.)
Other Stock-Based Awards. From time to time, we grant restricted stock and PSUs to various employees as a compensation benefit. We recognized total compensation expense of $4.8 million and $3.6 million for the three months ended May 31, 2018 and 2017, respectively, related to restricted stock and PSUs. We recognized total compensation expense of $8.4 million and $5.9 million for the six months ended May 31, 2018 and 2017, respectively, related to restricted stock and PSUs.