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Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 22, 2017 | Dec. 21, 2017 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2016
Schedule of Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  | $ 1,040.2 |  | $ 1,142.7 |  | $ 940.8 |  | $ 1,005.3 |  | $ 1,256.1 |  | $ 752.3 |  | $ 639.5 |  | $ 553.6 |  | $ 4,129.1 | $ 3,201.5 | $ 2,347.4
Operating income (loss) |  |  | 48.4 | [1] | 80.2 | [1] | 30.4 | [1] | 89.7 | [1] | 71.3 | [2] | (7.4) | [2] | (58.2) | [2] | (22.0) | [2] | 248.7 | (16.3) | (25.0)
Net income (loss) |  |  | 89.6 | [1],[3] | 191.1 | [1],[3] | 12.9 | [1],[3] | 174.5 | [1],[3] | 61.5 | [2],[4] | (30.5) | [2],[4] | (17.3) | [2],[4] | 0.8 | [2],[4] | 468.1 | 14.5 | 42.7
Net income (loss) attributable to Lions Gate Entertainment Corp. shareholders |  |  | $ 91.3 |  | $ 193.0 |  | $ 15.5 |  | $ 173.8 |  | $ 61.6 |  | $ (30.6) |  | $ (17.5) |  | $ 1.3 |  | $ 473.6 | $ 14.8 | $ 50.2
Per share information attributable to Lions Gate Entertainment Corp. shareholders: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic income (loss) per share (in usd per share) |  |  | $ 0.43 |  | $ 0.92 |  | $ 0.07 |  | $ 0.84 |  | $ 0.30 |  | $ (0.19) |  | $ (0.12) |  | $ 0.01 |  | $ 2.27 | $ 0.09 | $ 0.34
Diluted income (loss) per share (in usd per share) |  |  | $ 0.41 |  | $ 0.87 |  | $ 0.07 |  | $ 0.80 |  | $ 0.28 |  | $ (0.19) |  | $ (0.12) |  | $ 0.01 |  | $ 2.15 | $ 0.09 | $ 0.33
Restructuring and other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 59.8 | $ 88.7 | $ 19.8
Loss on extinguishment of debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 35.7 | 40.4 | 0.0
Gain on sale of equity interest in EPIX |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 201.0 | 0.0 | 0.0
Impairment of long-term investments and other assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 29.2 | 0.0 | 0.0
Deferred tax benefit from new tax legislation |  |  |  |  | $ 165.0 |  |  |  |  |  |  |  |  |  |  |  |  |  | 165.0 | 0.0 | 0.0
Federal statutory income tax rate | 21.00% | 35.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Benefit from Internal Capital Restructuring |  |  | $ 94.1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on Starz investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.0 | $ 20.4 | $ 0.0
Operating Income (Loss) And Net Income (Loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Per share information attributable to Lions Gate Entertainment Corp. shareholders: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring and other |  |  | 24.0 |  | 21.4 |  | $ 3.5 |  | $ 10.9 |  | $ 16.4 |  | $ 54.0 |  | $ 10.7 |  | $ 7.7 |  |  |  |
Restructuring and other items, net of tax |  |  | 15.7 |  | 14.5 |  | 2.5 |  | 8.9 |  | 11.9 |  | 42.5 |  | $ 6.8 |  | $ 4.9 |  |  |  |
Net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Per share information attributable to Lions Gate Entertainment Corp. shareholders: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on extinguishment of debt |  |  | 11.6 |  | 6.2 |  | 6.4 |  | 11.6 |  | 12.1 |  | 28.3 |  |  |  |  |  |  |  |
Loss on extinguishment of debt, net of tax |  |  | $ 7.8 |  | 4.6 |  | $ 4.7 |  | 8.5 |  | $ 5.8 |  | 23.4 |  |  |  |  |  |  |  |
Gain on sale of equity interest in EPIX |  |  |  |  |  |  |  |  | 201.0 |  |  |  |  |  |  |  |  |  |  |  |
Gain on sale of equity interest in EPIX, net of tax |  |  |  |  |  |  |  |  | $ 127.0 |  |  |  |  |  |  |  |  |  |  |  |
Impairment of long-term investments and other assets |  |  |  |  | 29.2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of long-term investments and other assets, net of tax |  |  |  |  | $ 20.1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on Starz investment |  |  |  |  |  |  |  |  |  |  |  |  | 20.4 |  |  |  |  |  |  |  |
Gain on Starz investment, net of tax |  |  |  |  |  |  |  |  |  |  |  |  | $ 20.4 |  |  |  |  |  |  |  |
[1] | During fiscal 2018, operating income and net income included the following items:•Restructuring and Other. The first, second, third and fourth quarter of fiscal 2018 included restructuring and other items of $10.9 million, $3.5 million, $21.4 million and $24.0 million, respectively (after tax $8.9 million, $2.5 million, $14.5 million, and $15.7 million, respectively) (see Note 14).
[2] | During fiscal 2017, operating income and net income included the following items: •Restructuring and Other. The first, second, third and fourth quarter of fiscal 2017 included restructuring and other items of $7.7 million, $10.7 million, $54.0 million, and $16.4 million, respectively (after tax $4.9 million, $6.8 million, $42.5 million, and $11.9 million, respectively) (see Note 14).
[3] | During fiscal 2018, net income also included the following items:•Loss on Extinguishment of Debt. The first, second, third and fourth quarter of fiscal 2018 included a loss on extinguishment of debt of $11.6 million, $6.4 million, $6.2 million and $11.6 million, respectively (after tax $8.5 million, $4.7 million, $4.6 million and $7.8 million, respectively) (see Note 7). •Gain on Sale of Equity Interest in EPIX. The first quarter of fiscal 2018 included a gain on sale of equity interest in EPIX of $201.0 million (after tax $127.0 million).•Impairment of Long-Term Investments and Other Assets. The third quarter of fiscal 2018 included impairment of long-term investments and other assets of $29.2 million (after tax $20.1 million) (see Note 5).•Impact of Corporate Tax Rate Change on Deferred Tax Liabilities. The third quarter of fiscal 2018 included a deferred tax benefit of $165.0 million resulting from the impact of the change in the U.S. federal corporate income tax rate from 35% to 21% under the Tax Cuts and Jobs Act on the Company's beginning net deferred tax liabilities (see Note 13).•Tax Benefit from Internal Capital Restructuring. The fourth quarter of fiscal 2018 included a net tax benefit of $94.1 million primarily from the internal capital restructuring in connection with our third party debt refinancing (see Note 7 to our consolidated financial statements), net of the charge from an increase in our valuation allowance associated with certain deferred tax assets (see Note 13).
[4] | During fiscal 2017, net income also included the following items:•Loss on Extinguishment of Debt. The third and fourth quarter of fiscal 2017 included a loss on extinguishment of debt, of $28.3 million and $12.1 million, respectively (after tax $23.4 million and $5.8 million, respectively) (see Note 7). •Gain on Starz Investment. The third quarter of fiscal 2017 included a gain on Starz investment of $20.4 million (after tax $20.4 million) (see Note 5 ).

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