Annual report pursuant to Section 13 and 15(d)

Document and Entity Information

Document and Entity Information - USD ($)
12 Months Ended
Mar. 31, 2018
May 18, 2018
Sep. 30, 2017
Document and Entity Information      
Entity Registrant Name KEMET CORP    
Entity Central Index Key 0000887730    
Document Type 10-K    
Document Period End Date Mar. 31, 2018    
Amendment Flag false    
Current Fiscal Year End Date --03-31    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Filer Category Accelerated Filer    
Entity Public Float     $ 1,164,758,499
Entity Common Stock, Shares Outstanding   56,944,132  
Document Fiscal Year Focus 2018    
Document Fiscal Period Focus FY