Annual report pursuant to Section 13 and 15(d)

Document and Entity Information

Document and Entity Information - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Mar. 31, 2020
Jun. 24, 2020
Sep. 30, 2019
Document Information [Line Items]      
Entity Central Index Key 0001009759    
Document Type 10-K    
Document Annual Report true    
Document Period End Date Mar. 31, 2020    
Document Transition Report false    
Entity File Number 001-15957    
Entity Registrant Name CAPSTONE TURBINE Corp    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 95-4180883    
Entity Address, Address Line One 16640 Stagg Street    
Entity Address, City or Town Van Nuys    
Entity Address, State or Province CA    
Entity Address, Postal Zip Code 91406    
City Area Code 818    
Local Phone Number 734-5300    
Entity Listing, Par Value Per Share $ 0.001    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Non-accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Public Float     $ 40.8
Entity Common Stock, Shares Outstanding   10,984,783  
Current Fiscal Year End Date --03-31    
Document Fiscal Year Focus 2020    
Document Fiscal Period Focus FY    
Amendment Flag false    
Common Stock      
Document Information [Line Items]      
Title of 12(b) Security Common Stock, par value $.001 per share    
Trading Symbol CPST    
Security Exchange Name NASDAQ    
Series B Junior Participating Preferred Stock      
Document Information [Line Items]      
Title of 12(b) Security Series B Junior Participating Preferred Stock Purchase Rights