Document and Entity Information - USD ($)
$ in Billions
 12 Months Ended
Mar. 31, 2019
May 13, 2019
Sep. 28, 2018
Document and Entity Information      
Entity Registrant Name FLEX LTD.    
Entity Central Index Key 0000866374    
Document Type 10-K    
Document Period End Date Mar. 31, 2019    
Amendment Flag false    
Current Fiscal Year End Date --03-31    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Shell Company false    
Entity Emerging Growth Company false    
Entity Small Business false    
Entity Filer Category Large Accelerated Filer    
Entity Public Float     $ 6.9
Entity Common Stock, Shares Outstanding (shares)   514,029,702  
Document Fiscal Year Focus 2019    
Document Period Fiscal Period Focus FY