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Stock Option Activity (Detail) - $ / shares shares in Thousands | 12 Months Ended
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May. 31, 2015 | May. 31, 2014 | May. 31, 2013
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |
Shares Outstanding, Beginning Balance | 1,869 | 2,092 | 2,314
Shares, Granted | 536 | 512 | 459
Shares, Exercised | (380) | (643) | (657)
Shares, Forfeited | (37) | (92) | (24)
Shares Outstanding, Ending Balance | 1,988 | 1,869 | 2,092
Weighted-Average Exercise Price, Beginning Balance | $ 25.69 | $ 19.21 | $ 14.89
Weighted-Average Exercise Price, Granted | 39.79 | 36.44 | 28.67
Weighted-Average Exercise Price, Exercised | 16.69 | 13.69 | 10.61
Weighted-Average Exercise Price, Forfeited | 33.55 | 22.08 | 19.67
Weighted-Average Exercise Price, Ending Balance | 31.04 | 25.69 | 19.21
Weighted-Average Grant Date Fair Value, Beginning Balance | 7.62 | 6.00 | 4.63
Weighted-Average Grant Date Fair Value, Granted | 11.91 | 9.87 | 9.21
Weighted-Average Grant Date Fair Value, Exercised | 5.17 | 4.28 | 3.43
Weighted-Average Grant Date Fair Value, Forfeited | 9.45 | 6.65 | 6.07
Weighted-Average Grant Date Fair Value, Ending Balance | $ 9.20 | $ 7.62 | $ 6.00

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- Definition Share Based Compensation Arrangement By Share Based Payment Award Options Exercised In Period Weighted Average Grant Date Fair Value + References No definition available. + Details
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- Definition Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period Weighted Average Grant Date Fair Value + References No definition available. + Details
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- Definition Share Based Compensation Arrangement by Share Based Payment Award, Options, Weighted Average Grant Date Fair Value + References No definition available. + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option 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)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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 (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option 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)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which option holders acquired shares when converting their stock options into shares. + References No definition available. + Details
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