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Employee Benefit Plans (Details) (USD $) In Millions | 12 Months Ended |
--- | --- | ---
May 31, 2011 | May 31, 2009 | May 31, 2010
Employee Benefit Plans (Textuals) [Abstract] |  |  |
Maximum salary deferral under incentive retirement plan | 50% of salary |  |
Employer matching contribution | 50% of an employee's voluntary contribution up to 4% of eligible pay for pay dates on or after January 1, 2011 | 100% of the first 3% of eligible pay and up to 50% of the next 2% of eligible pay, in effect prior to April 2009 |
Company contributions to the Plan | $ 3.5 | $ 14.3 |
Deferred compensation plans contribution | Eligible employees can defer up to 50% of their annual base salary and bonus and outside directors can defer 100% of their Board cash compensation |  |
Amounts accrued under deferred compensation plans | $ 8.9 |  | $ 7.3

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- Definition Defined contribution plan employer contribution + Details
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- Definition Description of the deferred compensation arrangement, including fixed amounts and determinable awards, or the method for determining payments and awards, the timing of such payments and awards, and any requisite service or performance criteria, as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 64, 65 + Details
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- Definition The carrying amount of the liability as of the balance sheet date to an individual under a deferred compensation arrangement. This amount may be the result of periodic accruals made over the period of active employment, or reflect termination benefits resulting contractual terms or a death benefit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 64, 65 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 6, 7 + Details
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- Definition Description of the terms and benefits provided by the employer's defined contribution plans. A defined contribution plan provides benefits in return for services rendered, provides an individual account for each participant, and has terms that specify how contributions to the individual's account are to be determined rather than the amount of benefits the individual is to receive. Under a defined contribution pension plan, the benefits a participant will receive depend solely on the amount contributed to the participant's account, the returns earned on investments of those contributions, and forfeitures of other participants' benefits that may be allocated to such participant's account. A description of the plan(s) including employee groups covered, the basis for determining contributions, and the nature and effects of significant matters affecting comparability of information for all periods presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 106 -Paragraph 518 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 11 + Details
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