Investments (Tables)

6 Months Ended

Nov. 30, 2014

Investments, Debt and Equity Securities [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 the Shred-it partnership:

					Range
(Dollars in millions)	Fair Value at April 30, 2014		Valuation Technique	Input	Low		High
Equity method investment - Shred-it partnership	$	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	%