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Cover
Apr. 03, 2020
Cover [Abstract]  
Document Type 8-K
Amendment Flag false
Document Period End Date Apr. 03, 2020
Current Fiscal Year End Date --03-31
Entity File Number 1-33026
Entity Registrant Name COMMVAULT SYSTEMS, INC.
Entity Central Index Key 0001169561
Entity Tax Identification Number 22-3447504
Entity Incorporation, State or Country Code DE
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
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Title of 12(b) Security Common Stock
Trading Symbol CVLT
Security Exchange Name NASDAQ
Entity Emerging Growth Company false