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Goodwill, Service Contracts and Other Assets (Details 2) (Service Contracts, USD $) In Thousands, unless otherwise specified	6 Months Ended
	Nov. 30, 2011
Service contracts
Balance at the beginning of the period	$ 102,312
Service contracts acquired	1,024
Service contracts amortization	(14,732)
Foreign currency translation	(1,943)
Balance at the end of the period	86,661
Rental Uniforms and Ancillary Products
Service contracts
Balance at the beginning of the period	44,628
Service contracts amortization	(7,218)
Foreign currency translation	(1,381)
Balance at the end of the period	36,029
First Aid, Safety and Fire Protection
Service contracts
Balance at the beginning of the period	35,878
Service contracts acquired	164
Service contracts amortization	(3,684)
Balance at the end of the period	32,358
Document Management
Service contracts
Balance at the beginning of the period	21,806
Service contracts acquired	860
Service contracts amortization	(3,830)
Foreign currency translation	(562)
Balance at the end of the period	$ 18,274

X

- Definition

Amount of reduction of finite-lived intangible assets due to amortization during the period.

+ References

No definition available.

+ Details

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Namespace Prefix:	ctas_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

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Namespace Prefix:	ctas_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

This element represents the increase (decrease) to the recorded value of finite-lived intangible assets for foreign currency translation adjustments.

+ References

No definition available.

+ Details

Name:	ctas_FiniteLivedIntangibleAssetsTranslationAdjustments
Namespace Prefix:	ctas_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The aggregate amount assigned to a major class of finite-lived intangible assets acquired either individually or as part of a group of assets (in either an asset acquisition or business combination). A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 142

-Paragraph 44

-Subparagraph a(1)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6905858&loc=d3e16265-109275

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The aggregate sum of gross carrying value of a major finite-lived intangible asset class, less accumulated amortization and any impairment charges. A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 142

-Paragraph 45

-Subparagraph a(1)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6905858&loc=d3e16323-109275

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant