FAIR VALUE MEASUREMENTS Narrative (Details) - USD ($) $ in Billions	Feb. 29, 2020	May 31, 2019
Marketable security investments maturity information [Abstract]
Percentage of marketable securities investments mature within one year	98.00%	33.00%
Percentage of marketable securities investments mature within one to four years	2.00%	67.00%
Senior notes [Member]
Marketable security investments maturity information [Abstract]
Total debt, carrying value	$ 51.7	$ 56.1
Fair Value Measurements Using Input Types Level 2 [Member] \| Senior notes [Member]
Marketable security investments maturity information [Abstract]
Total debt, fair value	$ 58.4	$ 58.4

Percentage of marketable securities investments mature within one to four years.

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Percentage of marketable securities investments mature within one year.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
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-Topic 210
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-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13433-108611

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