Document and Entity Information - shares	3 Months Ended
	Jun. 30, 2019	Jul. 31, 2019
Document and Entity Information
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2019
Document Transition Report	false
Entity File Number	001-15491
Entity Registrant Name	KEMET CORP
Entity Central Index Key	0000887730
Current Fiscal Year End Date	--03-31
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q1
Amendment Flag	false
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 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		58,025,570