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Description of Business, Basis of Presentation, and Significant Accounting Policies (Details) (USD $) | 12 Months Ended
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May 31, 2013 | May 31, 2012 | May 31, 2011
Accounting Policies [Abstract] |  |  |
Disclosure on geographic areas, Description of revenue from external customers | revenue within Germany, which represented less than one percent of the Company's total revenue | revenue within Germany, which represented less than one percent of the Company's total revenue | revenue within Germany, which represented less than one percent of the Company's total revenue
Disclosure on geographic areas, Long-lived assets | Long-lived assets in Germany are insignificant in relation to total long-lived assets of the Company | Long-lived assets in Germany are insignificant in relation to total long-lived assets of the Company |
Period in which payroll taxes typically remitted after receipt of collections from client | one to 30 days |  |
Maximum period payroll taxes remitted after receipt of collections from client | 90 days |  |
Allowance for doubtful accounts | $ 1,000,000 | $ 1,200,000 |
Direct costs billed and incurred | 3,000,000,000 | 3,300,000,000 | 3,900,000,000
Maximum individual workers' compensation claims liability | 1,000,000 | 1,000,000 |
Workers' compensation insurance costs in current liabilities | 6,800,000 | 6,200,000 |
Workers' compensation insurance costs in long-term liabilities | 13,700,000 | 19,000,000 |
Reserve for uncertain tax positions | $ 19,800,000 | $ 36,800,000 |
Minimum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Finite-Lived Intangible Asset, Useful Life | 5 years |  |
Maximum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Finite-Lived Intangible Asset, Useful Life | 12 years |  |
Building and Building Improvements [Member] | Minimum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment, Useful Life | 10 years |  |
Building and Building Improvements [Member] | Maximum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment, Useful Life | 35 years |  |
Data Processing Equipment [Member] | Minimum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment, Useful Life | 2 years |  |
Data Processing Equipment [Member] | Maximum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment, Useful Life | 7 years |  |
Furniture Fixtures And Equipment [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment, Useful Life | 7 years |  |
Leasehold Improvements [Member] | Maximum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment, Useful Life | 10 years |  |
Software Development [Member] | Minimum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment, Useful Life | 3 years |  |
Software Development [Member] | Maximum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment, Useful Life | 15 years |  |

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- Definition A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5074-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 4 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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