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Cover Page - shares
 6 Months Ended
Sep. 30, 2019
Nov. 04, 2019
Document Information [Line Items]    
Document Quarterly Report true  
Document Transition Report false  
Document Type 10-Q  
Document Period End Date Sep. 30, 2019  
Entity File Number 1-14880  
Entity Registrant Name LIONS GATE ENTERTAINMENT CORP /CN/  
Entity Central Index Key 0000929351  
Current Fiscal Year End Date --03-31  
Amendment Flag false  
Document Fiscal Year Focus 2020  
Document Fiscal Period Focus Q2  
Entity Incorporation, State or Country Code A1  
Entity Address, Address Line One 250 Howe Street  
Entity Address, Address Line Two 20th Floor  
Entity Address, City or Town Vancouver  
Entity Address, State or Province BC  
Entity Address, Postal Zip Code V6C 3R8  
City Area Code 877  
Local Phone Number 848-3866  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Emerging Growth Company false  
Entity Small Business false  
Entity Filer Category Large Accelerated Filer  
Entity Shell Company false  
Class A Voting Shares    
Document Information [Line Items]    
Title of 12(b) Security Class A Voting Common Shares, no par value per share  
Entity Common Stock, Shares Outstanding   82,724,792
Trading Symbol LGF.A  
Security Exchange Name NYSE  
Class B Non-Voting Shares    
Document Information [Line Items]    
Title of 12(b) Security Class B Non-Voting Common Shares, no par value per share  
Entity Common Stock, Shares Outstanding   135,206,037
Trading Symbol LGF.B  
Security Exchange Name NYSE  
Principal Executive Offices    
Document Information [Line Items]    
Entity Address, Address Line One 2700 Colorado Avenue  
Entity Address, City or Town Santa Monica  
Entity Address, State or Province CA  
Entity Address, Postal Zip Code 90404