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Goodwill and Intangible Assets, Net of Accumulated Amortization (Details Textuals) (USD $) In Millions | 12 Months Ended
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May 31, 2011 | May 31, 2010 | May 31, 2009
Goodwill and Intangible Assets, Net of Accumulated Amortization (Textuals) [Abstract] |  |  |
Goodwill | $ 513.7 | $ 421.6 |
Amortization of intangible assets | 20.3 | 21.1 | 21.0
Sure Payroll [Member] |  |  |
Goodwill [Line Items] |  |  |
Effect of changes in goodwill due to acquisition | 84.6 |  |
E Plan Member |  |  |
Goodwill [Line Items] |  |  |
Effect of changes in goodwill due to acquisition | $ 7.5 |  |

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- Definition Goodwill and Intangible Assets, Net of Accumulated Amortization. + Details
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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by (used in) operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph a(2) + Details
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- Definition Carrying amount as of the balance sheet date, which is the cumulative amount paid, adjusted for any amortization recognized prior to adoption of FAS 142 and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 43 + Details
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- Definition The aggregate amount of goodwill acquired in the period and allocated to the reportable segment. The value is stated at fair value based on the purchase price allocation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph e(1) + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + Details
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