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Valuation and Qualifying Accounts (Details) (USD $) In Millions | 12 Months Ended
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May 31, 2011 | May 31, 2010 | May 31, 2009
Allowance for doubtful accounts [Member] |  |  |
Valuation and Qualifying Accounts |  |  |
Balance as of beginning of year | $ 1.9 | $ 4.0 | $ 4.1
Additions charged to expenses | 1.8 | 2.6 | 2.9
Additions to other accounts | 0.4 |  |
Costs and deductions | 2.0 | 4.7 | 3.0
Balance as of end of year | 2.1 | 1.9 | 4.0
Reserve for client fund losses [Member] |  |  |
Valuation and Qualifying Accounts |  |  |
Balance as of beginning of year | 2.6 | 3.2 | 2.9
Additions charged to expenses | 1.9 | 3.5 | 4.4
Costs and deductions | 2.7 | 4.1 | 4.1
Balance as of end of year | $ 1.8 | $ 2.6 | $ 3.2

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- Definition Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 + Details
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- Definition Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, charged to costs and expenses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 + Details
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- Definition Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, charged to accounts other than costs and expenses in a given period + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 + Details
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- Definition Total of the deductions in a given period to allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, representing receivables written off as uncollectible and portions of the reserves utilized, respectively. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 + Details
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