Consolidating Financial Information - Convertible Senior Subordinated Notes (Statement of Operations) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Revenues	$ 1,142.7	$ 752.3	$ 3,088.8	$ 1,945.4
Expenses:
Direct operating	650.1	429.1	1,726.6	1,182.3
Distribution and marketing	237.1	174.8	669.7	521.8
General and administration	114.2	88.6	337.4	233.4
Depreciation and amortization	39.7	13.2	119.0	23.1
Restructuring and other	21.4	54.0	35.8	72.4
Total expenses	1,062.5	759.7	2,888.5	2,033.0
Operating income (loss)	80.2	(7.4)	200.3	(87.6)
Interest expense	(46.3)	(27.4)	(147.3)	(58.5)
Interest and other income	2.2	1.5	7.7	3.6
Loss on extinguishment of debt	(6.2)	(28.3)	(24.2)	(28.3)
Gain on sale of equity interest in EPIX	0.0	0.0	201.0	0.0
Gain on Starz investment	0.0	20.4	0.0	20.4
Impairment of long-term investments and other assets	(29.2)	0.0	(29.2)	0.0
Equity interests income (loss)	(13.8)	(1.5)	(34.8)	11.2
Income (loss) before income taxes	(13.1)	(42.7)	173.5	(139.2)
Income tax benefit	204.2	12.2	205.0	92.2
Net income (loss)	191.1	(30.5)	378.5	(47.0)
Less: Net (income) loss attributable to noncontrolling interests	1.9	(0.1)	3.8	0.2
Net income (loss) attributable to Lions Gate Entertainment Corp. shareholders	$ 193.0	$ (30.6)	382.3	(46.8)
Convertible Senior Subordinated Notes
Revenues			3,088.8	1,945.4
Expenses:
Direct operating			1,726.6	1,182.3
Distribution and marketing			669.7	521.8
General and administration			337.4	233.4
Depreciation and amortization			119.0	23.1
Restructuring and other			35.8	72.4
Total expenses			2,888.5	2,033.0
Operating income (loss)			200.3	(87.6)
Interest expense			(147.3)	(58.5)
Interest and other income			7.7	3.6
Loss on extinguishment of debt			(24.2)	(28.3)
Gain on sale of equity interest in EPIX			201.0
Gain on Starz investment				20.4
Impairment of long-term investments and other assets			(29.2)
Equity interests income (loss)			(34.8)	11.2
Income (loss) before income taxes			173.5	(139.2)
Income tax benefit			205.0	92.2
Net income (loss)			378.5	(47.0)
Less: Net (income) loss attributable to noncontrolling interests			3.8	0.2
Net income (loss) attributable to Lions Gate Entertainment Corp. shareholders			382.3	(46.8)
Convertible Senior Subordinated Notes \| Consolidating Adjustments
Revenues			0.0	0.0
Expenses:
Direct operating			0.0	0.0
Distribution and marketing			0.0	0.0
General and administration			(1.2)	(0.9)
Depreciation and amortization			0.0	0.0
Restructuring and other			0.0	0.0
Total expenses			(1.2)	(0.9)
Operating income (loss)			1.2	0.9
Interest expense			455.4	307.8
Interest and other income			(454.9)	(307.4)
Loss on extinguishment of debt			0.0	0.0
Gain on sale of equity interest in EPIX			0.0
Gain on Starz investment				0.0
Impairment of long-term investments and other assets			0.0
Equity interests income (loss)			(726.3)	87.9
Income (loss) before income taxes			(724.6)	89.2
Income tax benefit			183.3	28.3
Net income (loss)			(541.3)	117.5
Less: Net (income) loss attributable to noncontrolling interests			(0.3)	0.2
Net income (loss) attributable to Lions Gate Entertainment Corp. shareholders			(541.6)	117.7
Convertible Senior Subordinated Notes \| Lions Gate Entertainment Corp. \| Reportable Legal Entities
Revenues			0.0	0.0
Expenses:
Direct operating			0.0	0.0
Distribution and marketing			0.0	0.0
General and administration			1.8	1.4
Depreciation and amortization			0.0	0.0
Restructuring and other			2.0	2.3
Total expenses			3.8	3.7
Operating income (loss)			(3.8)	(3.7)
Interest expense			(98.7)	(45.7)
Interest and other income			321.0	173.4
Loss on extinguishment of debt			(22.9)	(21.9)
Gain on sale of equity interest in EPIX			0.0
Gain on Starz investment				20.4
Impairment of long-term investments and other assets			(10.0)
Equity interests income (loss)			173.4	(159.3)
Income (loss) before income taxes			359.0	(36.8)
Income tax benefit			23.1	(10.0)
Net income (loss)			382.1	(46.8)
Less: Net (income) loss attributable to noncontrolling interests			0.0	0.0
Net income (loss) attributable to Lions Gate Entertainment Corp. shareholders			382.1	(46.8)
Convertible Senior Subordinated Notes \| Lions Gate Entertainment Inc. \| Reportable Legal Entities
Revenues			4.9	11.9
Expenses:
Direct operating			0.0	1.8
Distribution and marketing			0.7	0.6
General and administration			129.6	96.9
Depreciation and amortization			7.9	8.3
Restructuring and other			19.0	62.5
Total expenses			157.2	170.1
Operating income (loss)			(152.3)	(158.2)
Interest expense			(164.8)	(170.8)
Interest and other income			0.0	0.0
Loss on extinguishment of debt			(1.3)	(3.3)
Gain on sale of equity interest in EPIX			0.0
Gain on Starz investment				0.0
Impairment of long-term investments and other assets			0.0
Equity interests income (loss)			536.4	67.0
Income (loss) before income taxes			218.0	(265.3)
Income tax benefit			(192.2)	106.2
Net income (loss)			25.8	(159.1)
Less: Net (income) loss attributable to noncontrolling interests			0.0	0.0
Net income (loss) attributable to Lions Gate Entertainment Corp. shareholders			25.8	(159.1)
Convertible Senior Subordinated Notes \| Non-guarantor Subsidiaries \| Reportable Legal Entities
Revenues			3,083.9	1,933.5
Expenses:
Direct operating			1,726.6	1,180.5
Distribution and marketing			669.0	521.2
General and administration			207.2	136.0
Depreciation and amortization			111.1	14.8
Restructuring and other			14.8	7.6
Total expenses			2,728.7	1,860.1
Operating income (loss)			355.2	73.4
Interest expense			(339.2)	(149.8)
Interest and other income			141.6	137.6
Loss on extinguishment of debt			0.0	(3.1)
Gain on sale of equity interest in EPIX			201.0
Gain on Starz investment				0.0
Impairment of long-term investments and other assets			(19.2)
Equity interests income (loss)			(18.3)	15.6
Income (loss) before income taxes			321.1	73.7
Income tax benefit			190.8	(32.3)
Net income (loss)			511.9	41.4
Less: Net (income) loss attributable to noncontrolling interests			4.1	0.0
Net income (loss) attributable to Lions Gate Entertainment Corp. shareholders			$ 516.0	$ 41.4

The amount of expense recognized that includes amortization of film and television production or acquisition costs, participation and residual expenses, provision for doubtful accounts, and foreign exchange gains and losses. Participation costs represent contingent consideration payable based on the performance of the film to parties associated with the film, including producers, writers, directors or actors, etc. Residuals represent amounts payable to various unions or guilds.

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