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Stock-Based Compensation - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
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May 31, 2017 | May 31, 2016 | May 31, 2015
Share Based Compensation Arrangement Stock Options [Abstract] |  |  |
Stock option vesting period range | one to four years |  |
Percentage of options vesting ratably over four years | 82.00% |  |
Restricted stock expiration period | ratably over a four-year period |  |
Stock-based compensation, key assumptions of valuation method | Black-Scholes |  |
Maximum term of stock options | 10 years |  |
Restricted stock granted | 153,984 | 139,838 | 154,115
Restricted stock, weighted-average fair value | $ 166.12 | $ 168.83 | $ 148.89
Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Abstract |  |  |
Total unrecognized compensation cost, net of estimated forfeitures | $ 187 |  |
Stock option remaining weighted average vesting period | 2 years |  |
Ratio Of Outstanding And Available To Grant Shares To Total Outstanding Common And Equity Compensation Shares And Equity Compensation Shares Available For Grant [Abstract] |  |  |
Ratio Of Outstanding And Available To Grant Shares To Total Outstanding Common And Equity Compensation Shares And Equity Compensation Shares Available For Grant | 8.00% |  |

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- Definition Total outstanding and available for grant related equity compensation divided by the outstanding common and equity compensation shares and equity compensation shares available for grant. + References No definition available. + Details
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- Definition Ratio Of Outstanding And Available To Grant Shares To Outstanding Common And Equity Compensation Shares And Equity Compensation Shares Available For Grant [Abstract] + References No definition available. + Details
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- Definition The time period after which the equity-based award restrictions expires as specified in the award agreement. + References No definition available. + Details
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- Definition The maximum period of time an equity-based award is expected to be outstanding. + References No definition available. + Details
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- Definition Description of pertinent provisions of share based compensation awards that have actual or potential impact upon the company's financial statements. Vesting term for the majority of stock options. + References No definition available. + Details
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- Definition Share Based Compensation Arrangement Stock Options [Abstract] + References No definition available. + Details
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- Definition Period of time over which a employee's right to exercise a stock option is no longer contingent on satisfaction of a service condition. + References No definition available. + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + 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 (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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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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- Definition For each plan, identification of the award pricing model or other valuation method used in calculating the weighted average fair values disclosed. The model is also used to calculate the compensation expense that is shown within the balance sheet, income statement, and cash flow. Examples of valuation techniques are lattice models (binomial model), closed-form models (Black-Scholes-Merton formula), and a Monte Carlo simulation technique. Fair value is the amount at which an asset or liability could be bought or incurred or sold or settled in a current transaction between willing parties, that is, other than in a forced or liquidation sale. May include disclosures about the assumptions underlying application of the method selected. + 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 (f)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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