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Stock-Based Compensation (Tables)
 12 Months Ended
May 31, 2013
Share-based Compensation [Abstract]  
Assumptions used to determine fair value of options
The fair value of these options was estimated at the date of grant using a Black-Scholes option-pricing model with the following assumptions:
 
2013
 
2012
 
2011
 
 
 
 
 
 
Risk-free interest rate
1.3
%
 
2.4
%
 
2.5
%
Dividend yield
1.8
%
 
1.7
%
 
1.5
%
Expected volatility of Cintas' common stock
28.0
%
 
28.0
%
 
30.0
%
Expected life of the option in years
7.5

 
7.5

 
7.5
Stock options granted and outstanding under either the 2005 Equity Compensation Plan or under previously adopted plans
The information presented in the following table relates primarily to stock options granted and outstanding under either the 2005 Equity Compensation Plan or under previously adopted plans:
 
Shares
 
Weighted
Average
Exercise
Price
 
 
 
 
Outstanding, June 1, 2010 (1,838,530 shares exercisable)
6,467,206

 
$
37.63

Granted
2,030,764

 
32.42

    Canceled
(833,267
)
 
38.76

Exercised
—

 
—

Outstanding, May 31, 2011 (1,945,207 shares exercisable)
7,664,703

 
36.12

Granted
1,638,907

 
36.26

    Canceled
(1,591,480
)
 
36.90

Exercised
(103,013
)
 
32.66

Outstanding, May 31, 2012 (2,105,702 shares exercisable)
7,609,117

 
36.04

Granted
1,722,081

 
44.67

    Canceled
(884,384
)
 
38.69

Exercised
(561,176
)
 
36.44

Outstanding, May 31, 2013 (1,815,795 shares exercisable)
7,885,638

 
$
37.60
Information related to stock options outstanding
The following table summarizes the information related to stock options outstanding at May 31, 2013:
 
 
 
Outstanding Options
 
Exercisable Options
Range of
Exercise Prices
Number
Outstanding
 
Average
Remaining
Option
Life
 
Weighted
Average
Exercise
Price
 
Number
Exercisable
 
Weighted
Average
Exercise
Price
$ 20.29 – $ 34.05
1,720,863
 
6.65
 
$
27.01

 
352,058

 
$
26.71

34.06 –  37.83
1,338,274
 
7.39
 
34.94

 
97,092

 
36.28

37.84 –   41.98
1,959,113
 
6.97
 
38.59

 
377,057

 
39.63

41.99 –    49.30
2,867,388
 
7.20
 
44.43

 
989,588

 
43.11

$ 20.29 – $ 49.30
7,885,638
 
7.05
 
$
37.60

 
1,815,795

 
$
38.85
Restricted stock awards granted and outstanding under either the 2005 Equity Compensation Plan or under previously adopted plans
The information presented in the following table relates to restricted stock awards granted and outstanding under either the 2005 Equity Compensation Plan or under previously adopted plans:
 
Shares
 
Weighted
Average
Grant
Price
Outstanding, unvested grants at June 1, 2010
1,407,351

 
$
27.45

Granted
712,721

 
31.59

  Canceled
(66,754
)
 
25.54

Vested
(135,936
)
 
39.26

Outstanding, unvested grants at May 31, 2011
1,917,382

 
28.22

Granted
452,267

 
35.95

  Canceled
(188,685
)
 
30.62

Vested
(291,968
)
 
27.60

Outstanding, unvested grants at May 31, 2012
1,888,996

 
29.93

Granted
810,453

 
41.72

  Canceled
(73,856
)
 
31.78

Vested
(610,570
)
 
25.40

Outstanding, unvested grants at May 31, 2013
2,015,023

 
$
35.97