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Cover - shares
 6 Months Ended
Sep. 30, 2025
Oct. 27, 2025
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Sep. 30, 2025  
Document Transition Report false  
Entity File Number 001-33026  
Registrant Name Commvault Systems, Inc  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 22-3447504  
Entity Address, Address Line One 1 Commvault Way  
Entity Address, City or Town Tinton Falls  
Entity Address, State or Province NJ  
Entity Address, Postal Zip Code 07724  
City Area Code 732  
Local Phone Number 870-4000  
Title of 12(b) Security Common Stock, $0.01 par value per share  
Trading Symbol CVLT  
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  
Entity Common Stock, Shares Outstanding   44,094,362
Central Index Key 0001169561  
Current Fiscal Year End Date --03-31  
Document Fiscal Year Focus 2026  
Document Fiscal Period Focus Q2  
Amendment Flag false