Fair Value Measurements (Changes In Fair Value Of Contingent Consideration) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
Feb. 28, 2015
Fair Value Measurements [Abstract]
Balance at May 31, 2014	$ 2,985
(Gains)/Losses recognized in earnings	239calm_GainLossOnContingentConsideration
Actual payments made	(2,200)
Balance at February 28, 2015	$ 1,024

Amount of liability recognized arising from contingent consideration in a business combination.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 30

-Section 25

-Paragraph 6

-URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 30

-Section 35

-Paragraph 1

-Subparagraph b

-URI http://asc.fasb.org/extlink&oid=6911338&loc=d3e6819-128478

Name:	us-gaap_BusinessCombinationContingentConsiderationLiability
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant