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Investments (Tables)
 12 Months Ended
May 31, 2014
Investments [Abstract]  
Summary of quantitative information about significant unobservable inputs
The following table details quantitative information about significant unobservable inputs used in the initial valuation of Cintas' investment in Shred-it:
 
 
 
 
 
 
 
 
Range
(Dollars in millions)
 
Fair Value at April 30, 2014
 
Valuation Technique
 
Input
 
Low
 
High
Equity method investment - Shred-it
 
$
339.4

 
Discounted Cash Flow
 
EBITDA Margin
 
20.0
%
 
22.0
%
 
 
 
 
 
 
Ratio of capital expenditures
  to revenues
 
4.5
%
 
5.5
%
 
 
 
 
 
 
Long-term revenue growth
 
1.5
%
 
2.0
%
 
 
 
 
 
 
WACC Rate
 
9.0
%
 
9.0
%