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Capital Stock and Stock-Based Awards (Tables)
12 Months Ended
May 31, 2020
Share-based Payment Arrangement [Abstract]  
Schedule of capital stock
Capital stock consisted of the following as of May 31, 2020:
 
Class A Stock
 
Common Stock
 
Preferred Stock
Authorized
4,000,000

 
70,000,000

 
2,000,000

Reserved for Issuance

 
8,409,143

 

Outstanding
1,656,200

 
32,529,874

 


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 Company's equity plans for the fiscal years ended May 31:
 
2020
 
2019
 
2018
Total intrinsic value of stock options exercised
$
0.2

 
$
2.1

 
$
5.0

Total stock-based compensation cost (pretax)
 
3.8

 
 
8.3

 
 
10.7

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

 
 
(0.2
)
Weighted average grant date fair value per option
$
6.99

 
$
11.97

 
$
10.45



Schedule of stock option activity
The following table sets forth the stock option activity under the Company's equity plans for the fiscal year ended May 31, 2020:
 
Options
 
Weighted
Average
Exercise Price
 
Average Remaining
Contractual
Term (in years)
 
Aggregate
Intrinsic Value (in millions)
Outstanding at May 31, 2019
 
2,942,129

 
$
36.62

 
 
 
 
 
 

Additional grants (1)
 
2,306

 
 
42.96

 
 
 
 
 
 
Granted
 
125,563

 
 
32.12

 
 
 
 
 
 

Exercised
 
(26,326
)
 
 
30.56

 
 
 
 
 
 

Expired, canceled and forfeited
 
(40,691
)
 
 
40.72

 
 
 
 
 
 

Outstanding at May 31, 2020
 
3,002,981

 
$
36.43

 
 
5.5
 
$
1.2

Exercisable at May 31, 2020
 
2,215,823

 
$
35.46

 
 
4.6
 
$
1.1


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 RSUs activity for the year ended May 31, 2020:
 
Restricted stock units and MSPP RSUs
 
 
 
Weighted
Average grant
date fair value
Nonvested as of May 31, 2019
287,564

 
 
$
25.61

Granted
38,475

 
 
 
30.21

Vested
(98,942
)
 
 
 
28.36

Forfeited
(664
)
 
 
 
34.04

Nonvested as of May 31, 2020
226,433

 
 
$
25.11


Schedule of employee stock purchase plan activity
The following table sets forth the ESPP share activity for the fiscal years ended May 31:
 
 
2020
 
 
2019
 
 
2018
Shares issued
 
65,714

 
 
48,000

 
 
50,516

Weighted average purchase price per share
$
27.84

 
$
36.25

 
$
33.74


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:
 
 
2020
 
 
2019
 
 
2018
Granted
 
34,632

 
 
82,044

 
 
68,089

Weighted average grant date price per unit
$
32.56

 
$
42.86

 
$
38.97


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 RSUs activity for the fiscal years ended May 31:
 
 
2020
 
 
2019
 
 
2018
MSPP RSUs allocated
 
3,843

 
 
17,239

 
 
73,965

Purchase price per unit
$
24.36

 
$
30.48

 
$
28.76