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Stock-Based Compensation (Tables)
 12 Months Ended
May 31, 2018
Share-based Compensation [Abstract]  
Assumptions Used to Determine Fair Value of Options
The fair value of options was estimated at the date of grant using a Black-Scholes option-pricing model with the following assumptions:
 
2018
 
2017
 
2016
 
 
 
 
 
 
Risk-free interest rate
1.8
%
 
1.2
%
 
2.0
%
Dividend yield
1.2
%
 
1.3
%
 
1.4
%
Expected volatility of Cintas' common stock
17.2
%
 
21.6
%
 
23.3
%
Expected life of the option in years
6.5

 
7.5

 
7.5
Stock Options Granted and Outstanding
The information presented in the following table relates primarily to stock options granted and outstanding under either the 2016 Plan or under previously adopted plans:
 
Shares
 
Weighted
Average
Exercise
Price
 
 
 
 
Outstanding, June 1, 2015 (1,426,550 shares exercisable)
7,835,570

 
$
51.59

Granted
1,739,767

 
93.55

Canceled
(4,413
)
 
34.56

Forfeited
(231,042
)
 
60.57

Exercised
(919,975
)
 
35.07

Outstanding, May 31, 2016 (1,649,236 shares exercisable)
8,419,907

 
61.83

Granted
1,343,180

 
126.51

Canceled
(5,368
)
 
32.45

Forfeited
(165,452
)
 
73.43

Exercised
(1,004,217
)
 
35.95

Outstanding, May 31, 2017 (1,795,898 shares exercisable)
8,588,050

 
74.77

Granted
1,664,867

 
175.86

Canceled
(7,809
)
 
45.10

Forfeited
(255,627
)
 
94.73

Exercised
(1,059,295
)
 
44.06

Outstanding, May 31, 2018 (2,006,922 shares exercisable)
8,930,186

 
$
96.71
Summary of Information Related to Stock Options Outstanding
The following table summarizes the information related to stock options outstanding at May 31, 2018:
 
 
 
Outstanding Options
 
Exercisable Options
Range of
Exercise Prices
Number
Outstanding
 
Average
Remaining
Option
Life
 
Weighted
Average
Exercise
Price
 
Number
Exercisable
 
Weighted
Average
Exercise
Price
  $ 22.42 – $ 59.50
1,901,639
 
4.03
 
$
39.27

 
1,615,907

 
$
37.74

 59.51 – 89.78
2,671,836
 
6.69
 
76.01

 
348,008

 
65.55

   89.79 –  109.33
1,346,379
 
8.13
 
107.33

 
42,346

 
101.57

  109.34  –  182.25
3,010,332
 
9.55
 
158.55

 
661

 
137.30

    $ 22.42  – $ 182.25
8,930,186
 
7.31
 
$
100.73

 
2,006,922

 
$
43.94
Restricted Stock Awards Granted and Outstanding
The information presented in the following table relates to restricted stock awards granted and outstanding under either the 2016 Plan or under previously adopted plans:
 
Shares
 
Weighted
Average
Grant Price
 
 
 
 
Outstanding, unvested grants at June 1, 2015
2,210,113

 
$
57.60

Granted
1,069,748

 
92.10

Forfeited
(70,998
)
 
65.79

Vested
(605,427
)
 
38.76

Outstanding, unvested grants at May 31, 2016
2,603,436

 
75.94

Granted
614,076

 
128.63

Forfeited
(46,766
)
 
81.23

Vested
(428,672
)
 
48.67

Outstanding, unvested grants at May 31, 2017
2,742,074

 
91.91

Granted
669,932

 
183.83

Forfeited
(69,416
)
 
102.96

Vested
(701,476
)
 
64.64

Outstanding, unvested grants at May 31, 2018
2,641,114

 
$
122.18