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Employee Benefit Plans (Details) - USD ($) $ in Millions | 12 Months Ended | 22 Months Ended
--- | --- | ---
May 31, 2016 | May 31, 2015 | May 31, 2014 | Nov. 30, 2013
401 (K) Plan [Member] |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |
Maximum percentage of salary deferral | 50.00% |  |  |
Years of service to be eligible for matching contribution | 1 year |  |  |
Minimum number of hours worked for eligibility | 41 days 16 hours |  |  |
Percentage of employer matching contributions of eligible employee pay | 50.00% |  |  | 50.00%
Percentage of employee pay eligible for employer matching contributions | 8.00% |  |  | 6.00%
Company contributions to the plan | $ 21.4 | $ 19.6 | $ 16.4 |
Percentage participant directed | 100.00% |  |  |
Deferred Compensation Plans [Member] |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |
Percentage of annual base salary and bonus that eligible employees may defer | 50.00% |  |  |
Percentage of Board cash compensation that eligible outside directors may defer | 100.00% |  |  |
Amounts accrued under deferred compensation plans | $ 14.9 | $ 14.2 |  |

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- Definition Defined Contribution Plan, Employer Matching Contribution, Minimum Number Of Hours Worked For Eligibility + 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 Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 30 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6409875&loc=d3e20015-108363 + 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=49170846&loc=d3e28014-114942 + Details
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