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Capital Stock and Stock-Based Awards (Tables)
12 Months Ended
May 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of capital stock
Capital stock consisted of the following as of May 31, 2019:
 
Class A Stock
 
Common Stock
 
Preferred Stock
Authorized
4,000,000

 
70,000,000

 
2,000,000

Reserved for Issuance

 
8,501,147

 

Outstanding
1,656,200

 
33,410,323

 

Schedule of share-based compensation activity
The following table sets forth the intrinsic value of stock options exercised, pretax stock-based compensation cost and related tax benefits for the Class A Stock and Common Stock plans for the fiscal years ended May 31:
 
2019
 
2018
 
2017
Total intrinsic value of stock options exercised
 
$
2.1

 
 
$
5.0

 
 
$
11.0

Total stock-based compensation cost (pretax)
 
8.3

 
 
10.7

 
 
10.1

Tax benefits (shortfalls) related to stock-based compensation cost
 
0.5

 
 
(0.2
)
 
 
0.8

Weighted average grant date fair value per option
 
$
11.97

 
 
$
10.45

 
 
$
12.70

Schedule of stock option activity
The following table sets forth the stock option activity for the Common Stock plans for the fiscal year ended May 31, 2019:
 
Options
 
Weighted
Average
Exercise Price
 
Average Remaining
Contractual
Term (in years)
 
Aggregate
Intrinsic Value (in millions)
Outstanding at May 31, 2018
2,822,126

 
 
$
35.52

 
 
 
 
 

Granted
358,369

 
 
42.77

 
 
 
 
 

Exercised
(214,273
)
 
 
31.87

 
 
 
 
 

Expired, canceled and forfeited
(24,093
)
 
 
42.02

 
 
 
 
 

Outstanding at May 31, 2019
2,942,129

 
 
$
36.62

 
6.3
 
 
$
3.6

Exercisable at May 31, 2019
1,799,534

 
 
$
34.14

 
5.0
 
 
$
3.6

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of nonvested restricted stock unit activity
The following table sets forth the restricted stock unit and MSPP Stock Unit activity for the year ended May 31, 2019:
 
Restricted stock units and MSPP stock units
 
Weighted
Average grant
date fair value
Nonvested as of May 31, 2018
298,094

 
 
$
21.78

Granted
99,283

 
 
37.07

Vested
(107,315
)
 
 
25.19

Forfeited
(2,498
)
 
 
42.02

Nonvested as of May 31, 2019
287,564

 
 
$
25.61

Schedule of employee stock purchase plan activity
The following table sets forth the ESPP share activity for the fiscal years ended May 31:
 
2019
 
2018
 
2017
Shares issued
 
48,000

 
 
50,516

 
 
42,799

Weighted average purchase price per share
$
36.25

 
$
33.74

 
$
35.58

Restricted Stock Units (RSUs) [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of restricted stock unit activity
The following table sets forth the restricted stock unit award activity for the fiscal years ended May 31:
 
2019
 
2018
 
2017
Granted
 
82,044

 
 
68,089

 
 
52,331

Weighted average grant date price per unit
 
$
42.86

 
 
$
38.97

 
 
$
39.22

Management Stock Purchase Plan [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of restricted stock unit activity
The following table sets forth the MSPP Stock Unit activity for the fiscal years ended May 31:
 
2019
 
2018
 
2017
MSPP Stock Units allocated
 
17,239

 
 
73,965

 
 
42,565

Purchase price per unit
 
$
30.48

 
 
$
28.76

 
 
$
28.49