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Cover Page - shares
 6 Months Ended
Jan. 31, 2020
Feb. 28, 2020
Entity Addresses [Line Items]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jan. 31, 2020  
Document Transition Report false  
Entity File Number 001-38413  
Entity Registrant Name ZSCALER, INC.  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 26-1173892  
Entity Address, Address Line One 120 Holger Way  
Entity Address, City or Town San Jose  
Entity Address, State or Province CA  
Entity Address, Postal Zip Code 95134  
City Area Code 408  
Local Phone Number 533-0288  
Title of 12(b) Security Common Stock, $0.001 Par Value  
Trading Symbol ZS  
Security Exchange Name NASDAQ  
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  
Shares Outstanding   129,351,577
Entity Central Index Key 0001713683  
Current Fiscal Year End Date --07-31  
Document Fiscal Year Focus 2020  
Document Fiscal Period Focus Q2  
Amendment Flag false  
Former Address    
Entity Addresses [Line Items]    
Entity Address, Address Line One 110 Rose Orchard Way  
Entity Address, City or Town San Jose  
Entity Address, State or Province CA  
Entity Address, Postal Zip Code 95134