Cover Page
12 Months Ended
May 31, 2019
Document Information [Line Items]  
Document Type 20-F
Amendment Flag false
Document Period End Date May 31, 2019
Document Fiscal Year Focus 2019
Document Fiscal Period Focus FY
Entity Registrant Name New Oriental Education & Technology Group Inc.
Entity Central Index Key 0001372920
Current Fiscal Year End Date --05-31
Entity Well-known Seasoned Issuer Yes
Entity Current Reporting Status Yes
Entity Filer Category Large Accelerated Filer
Entity Voluntary Filers No
Entity Shell Company false
Entity Emerging Growth Company false
Entity Interactive Data Current Yes
Entity Common Stock, Shares Outstanding 157,849,714
Document Accounting Standard U.S. GAAP
Entity Incorporation, State or Country Code E9
Entity Address, Country CN
Document Annual Report true
Document Transition Report false
Document Shell Company Report false
Document Registration Statement false
Common Stock [Member]  
Document Information [Line Items]  
No Trading Symbol Flag true
Title of 12(b) Security Common shares
Security Exchange Name NYSE
American Depositary Shares [Member]  
Document Information [Line Items]  
Trading Symbol EDU
Title of 12(b) Security American depositary shares, each representing one common share
Security Exchange Name NYSE