Retirement and Pension Plans - Additional Information (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
May 31, 2012	May 31, 2011	May 31, 2010
U. S. [Member]
Defined contribution profit sharing plan
Percentage of team member's contribution matched by company	100.00%
Maximum percentage of team member's compensation matched by Company	6.00%
Amounts expensed under profit sharing plan	$ 11.6	$ 10.9	$ 8.1
Europe [Member]
Defined contribution profit sharing plan
Amounts expensed under profit sharing plan	$ 7.2	$ 6.9	$ 5.7

The amount of the cost recognized during the period for defined contribution plans.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 70

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

-Paragraph 11

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.

Name:	us-gaap_DefinedContributionPlanCostRecognized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration