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Awards and Restricted Stock Units Issued under 2007 Plan and 2014 Omnibus Plan (Detail) - 2007 Plan and 2014 Omnibus Plan - $ / shares | 12 Months Ended
--- | ---
May 31, 2017 | May 31, 2016 | May 31, 2015
Weighted-Average Grant-Date Fair Value |  |  |
Beginning Balance | $ 23.27 |  |
Shares granted | 50.99 | $ 46.63 | $ 44.60
Shares exercised | 21.06 |  |
Ending Balance | $ 25.04 | $ 23.27 |
Shares |  |  |
Beginning Balance | 793,000 |  |
Shares granted | 48,041 |  |
Shares exercised | (39,000) |  |
Ending Balance | 802,000 | 793,000 |

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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 The weighted average fair value at grant date for nonvested equity-based awards issued 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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