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Cover Page - shares
9 Months Ended
Jun. 30, 2020
Aug. 10, 2020
Cover [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Jun. 30, 2020  
Document Fiscal Year Focus 2020  
Document Fiscal Period Focus Q3  
Current Fiscal Year End Date --09-30  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Registrant Name Twist Bioscience Corp  
Entity Central Index Key 0001581280  
Entity Shell Company false  
Entity Filer Category Non-accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company true  
Entity Ex Transition Period true  
Security Exchange Name NASDAQ  
Entity Address, State or Province CA  
Title of 12(b) Security Common Stock  
Trading Symbol TWST  
Entity Common Stock, Shares Outstanding   44,662,970
Entity Incorporation, State or Country Code DE  
Document Quarterly Report true  
Document Transition Report false