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Capital Stock and Stock-Based Awards (Details) - Schedule of employee stock purchase plan activity - Employee Stock Purchase Plan [Member] - $ / shares | 12 Months Ended
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May. 31, 2015 | May. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares issued | 55,501 | 57,835
Weighted average purchase price per share (in Dollars per share) | $ 31.98 | $ 26.92

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- Definition Weighted average price share of common stock issued during the period as a result of an employee stock purchase plan. + References No definition available. + 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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- Definition Number of shares issued during the period as a result of an employee stock purchase plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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