Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions |
12 Months Ended | ||
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May. 31, 2015 |
May. 31, 2014 |
May. 31, 2013 |
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| Allowance for Doubtful Accounts [Member] | |||
| Movement in Valuation Allowances and Reserves [Roll Forward] | |||
| Balance as of beginning of fiscal year | $ 1.5 | $ 1.0 | $ 1.2 |
| Additions charged to expenses | 1.6 | 2.5 | 1.7 |
| Additions to/(deductions from) other accounts | 0.1 | 0.0 | 0.0 |
| Costs and deductions | 1.8 | 2.0 | 1.9 |
| Balance as of end of fiscal year | 1.4 | 1.5 | 1.0 |
| Reserve For Client Fund Losses [Member] | |||
| Movement in Valuation Allowances and Reserves [Roll Forward] | |||
| Balance as of beginning of fiscal year | 1.9 | 2.4 | 2.1 |
| Additions charged to expenses | 2.0 | 2.2 | 2.7 |
| Additions to/(deductions from) other accounts | (0.2) | 0.0 | 0.0 |
| Costs and deductions | 1.9 | 2.7 | 2.4 |
| Balance as of end of fiscal year | $ 1.8 | $ 1.9 | $ 2.4 |
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. No definition available.
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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. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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