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Capital Stock and Stock-Based Awards (Details) - Schedule of restricted stock units under the management stock purchase plan - Management Stock Purchase Plan [Member] - $ / shares | 12 Months Ended
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May 31, 2017 | May 31, 2016 | May 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Granted (Shares) | 42,565 | 58,633 | 67,027
Purchase price per unit (in Dollars per share) | $ 28.49 | $ 30.38 | $ 23.79

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- Definition Price per share of restricted stock units under the management stock purchase plan during the period. + References No definition available. + Details
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Period Type: | duration

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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + 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. + References No definition available. + Details
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- Details
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