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Capital Stock (Shares Repurchased) (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Mar. 31, 2015
Equity [Abstract] |  |  |
Shares Repurchased | 0 | 3,600,395 | 5,026,512
Aggregate Cost of Shares | $ 0.0 | $ 73.2 | $ 136.5
Weighted Average Repurchase Price Per Share | $ 0.00 | $ 20.33 | $ 27.16

X
- Definition Number of shares that have been repurchased during the period. + References No definition available. + Details
Name: | lgfa_SharesRepurchasedDuringPeriodShares
Namespace Prefix: | lgfa_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Equity impact of the cost of common shares repurchased during the period. + References No definition available. + Details
Name: | lgfa_SharesRepurchasedDuringPeriodValue
Namespace Prefix: | lgfa_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The weighted average price per share for repurchases during the period. + References No definition available. + Details
Name: | lgfa_WeightedAverageRepurchasePricePerShare
Namespace Prefix: | lgfa_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_EquityAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration