Annual report pursuant to Section 13 and 15(d)

Cover Page

Cover Page - USD ($)
12 Months Ended
Mar. 31, 2020
May 26, 2020
Sep. 30, 2018
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Mar. 31, 2020    
Document Transition Report false    
Entity File Number 001-15491    
Entity Registrant Name KEMET Corp    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 57-0923789    
Entity Address, Address Line One KEMET Tower, One East Broward Blvd.    
Entity Address, City or Town Fort Lauderdale    
Entity Address, State or Province FL    
Entity Address, Postal Zip Code 33301    
City Area Code 954    
Local Phone Number 766-2800    
Title of 12(b) Security Common Stock, par value $0.01    
Trading Symbol KEM    
Security Exchange Name NYSE    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
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 Public Float     $ 1,044,995,999
Entity Common Stock, Shares Outstanding   58,508,445  
Entity Central Index Key 0000887730    
Amendment Flag false    
Current Fiscal Year End Date --03-31    
Document Fiscal Year Focus 2020    
Document Fiscal Period Focus FY