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COVER - shares
 6 Months Ended
Jun. 30, 2024
Aug. 06, 2024
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jun. 30, 2024  
Document Transition Report false  
Entity File Number 001-41477  
Entity Registrant Name Biohaven Ltd.  
Entity Incorporation, State or Country Code D8  
Entity Address, Address Line One c/o Biohaven Pharmaceuticals, Inc.  
Entity Address, Address Line Two 215 Church Street  
Entity Address, City or Town New Haven  
Entity Address, State or Province CT  
Entity Address, Postal Zip Code 06510  
City Area Code 203  
Local Phone Number 404-0410  
Title of 12(b) Security Common Shares, no par value  
Trading Symbol BHVN  
Security Exchange Name NYSE  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   94,542,253
Entity Central Index Key 0001935979  
Document Fiscal Year Focus 2024  
Document Fiscal Period Focus Q2  
Amendment Flag false  
Current Fiscal Year End Date --12-31