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Employee Benefit Plans (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended | 13 Months Ended | 16 Months Ended
--- | --- | --- | ---
May 31, 2013 | May 31, 2012 | May 31, 2011 | Feb. 01, 2012 | May 31, 2013
Employee Benefit Plans (Textual) [Abstract] |  |  |  |  |
Maximum percentage of salary deferral under 401(k) plan | 50.00% |  |  |  |
Company contributions to the plan | $ 13.1 | $ 10.3 | $ 3.5 |  |
Amounts accrued under deferred compensation plans | $ 10.7 | $ 9.2 |  |  | $ 10.7
Percentage of eligible pay that is matched by the employer | 50.00% |  |  |  |
Percentage of employee pay eligible for employer matching contribution |  |  |  | 4.00% | 6.00%
Percentage of annual base salary that eligible employees can defer under Deferred Compensation Plan | 50.00% |  |  |  |
Percentage of board cash compensation that may be deferred under Deferred Compensation Plan | 100.00% |  |  |  |

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- Definition Percentage of the employee's match-eligible pay that is matched by the employer. + References No definition available. + 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FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 64, 65 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 30 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6409875&loc=d3e20015-108363 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 6, 7 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 11 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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