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Capital Stock and Stock-Based Awards (Tables)
12 Months Ended
May 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of capital stock
Capital stock consisted of the following as of May 31, 2018:
 
Class A Stock
 
Common Stock
 
Preferred Stock
Authorized
4,000,000

 
70,000,000

 
2,000,000

Reserved for Issuance

 
6,278,191

 

Outstanding
1,656,200

 
33,320,335

 

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:
 
2018
 
2017
 
2016
Total intrinsic value of stock options exercised
 
$
5.0

 
 
$
11.0

 
 
$
14.6

Stock-based compensation cost (pretax)
 
10.7

 
 
10.1

 
 
9.7

Tax benefits related to stock-based compensation cost
 
(0.2
)
 
 
0.8

 
 
1.8

Weighted average grant date fair value per option
 
$
10.45

 
 
$
12.70

 
 
$
14.78

Schedule of stock option activity
The following table sets forth the stock option activity for the Class A Stock and Common Stock plans for the fiscal year ended May 31, 2018:
 
Options
 
Weighted
Average
Exercise Price
 
Average Remaining
Contractual
Term (in years)
 
Aggregate
Intrinsic Value (in millions)
Outstanding at May 31, 2017
2,693,824

 
 
$
33.81

 
 
 
 
 

Granted
717,851

 
 
38.79

 
 
 
 
 

Exercised
(526,508
)
 
 
30.60

 
 
 
 
 

Expired, cancellations and forfeitures
(63,041
)
 
 
40.89

 
 
 
 
 

Outstanding at May 31, 2018
2,822,126

 
 
$
35.52

 
6.8
 
 
$
26.8

Exercisable at May 31, 2018
1,514,248

 
 
$
32.33

 
5.3
 
 
$
19.2

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, 2018:
 
Restricted stock units and MSPP stock units
 
Weighted
Average grant
date fair value
Nonvested as of May 31, 2017
310,075

 
 
$
22.28

Granted
142,054

 
 
23.34

Vested
(151,444
)
 
 
23.99

Forfeited
(2,591
)
 
 
37.63

Nonvested as of May 31, 2018
298,094

 
 
$
21.78

Schedule of employee stock purchase plan activity
The following table sets forth the ESPP share activity for the fiscal years ended May 31:
 
2018
 
2017
 
2016
Shares issued
 
50,516

 
 
42,799

 
 
43,141

Weighted average purchase price per share
$
33.74

 
$
35.58

 
$
33.65

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:
 
2018
 
2017
 
2016
Granted
 
68,089

 
 
52,331

 
 
74,536

Weighted average grant date price per unit
 
$
38.97

 
 
$
39.22

 
 
$
43.10

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:
 
2018
 
2017
 
2016
MSPP Stock Units allocated
 
73,965

 
 
42,565

 
 
58,633

Purchase price per unit
 
$
28.76

 
 
$
28.49

 
 
$
30.38