Consolidating Financial Information - Convertible Senior Subordinated Notes (Statement of Operations) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Revenues	$ 940.8	$ 639.5	$ 1,946.1	$ 1,193.1
Expenses:
Direct operating	521.6	386.9	1,076.4	753.2
Distribution and marketing	234.5	222.0	432.6	347.0
General and administration	111.5	73.8	223.3	144.8
Depreciation and amortization	39.3	4.3	79.3	10.0
Restructuring and other	3.5	10.7	14.4	18.3
Total expenses	910.4	697.7	1,826.0	1,273.3
Operating income (loss)	30.4	(58.2)	120.1	(80.2)
Other expenses (income):
Interest expense	48.7	15.9	101.0	31.1
Interest and other income	(2.7)	(1.3)	(5.5)	(2.2)
Loss on extinguishment of debt	6.4	0.0	18.0	0.0
Total other expenses (income)	52.4	14.6	113.5	28.9
Income (loss) before equity interests and income taxes	(22.0)	(72.8)	6.6	(109.1)
Equity interests income (loss)	(12.7)	1.9	(21.0)	12.7
Gain on sale of equity interest in EPIX	0.0	0.0	201.0	0.0
Income (loss) before income taxes	(34.7)	(70.9)	186.6	(96.4)
Income tax benefit	(47.6)	(53.6)	(0.8)	(79.9)
Net income (loss)	12.9	(17.3)	187.4	(16.5)
Less: Net (income) loss attributable to noncontrolling interests	2.6	(0.2)	1.9	0.3
Net income (loss) attributable to Lions Gate Entertainment Corp. shareholders	$ 15.5	$ (17.5)	189.3	(16.2)
Convertible Senior Subordinated Notes
Revenues			1,946.1	1,193.1
Expenses:
Direct operating			1,076.4	753.2
Distribution and marketing			432.6	347.0
General and administration			223.3	144.8
Depreciation and amortization			79.3	10.0
Restructuring and other			14.4	18.3
Total expenses			1,826.0	1,273.3
Operating income (loss)			120.1	(80.2)
Other expenses (income):
Interest expense			101.0	31.1
Interest and other income			(5.5)	(2.2)
Loss on extinguishment of debt			18.0
Total other expenses (income)			113.5	28.9
Income (loss) before equity interests and income taxes			6.6	(109.1)
Equity interests income (loss)			(21.0)	12.7
Gain on sale of equity interest in EPIX			201.0
Income (loss) before income taxes			186.6	(96.4)
Income tax benefit			(0.8)	(79.9)
Net income (loss)			187.4	(16.5)
Less: Net (income) loss attributable to noncontrolling interests			1.9	0.3
Net income (loss) attributable to Lions Gate Entertainment Corp. shareholders			189.3	(16.2)
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			(0.8)	(0.6)
Depreciation and amortization			0.0	0.0
Restructuring and other			0.0	0.0
Total expenses			(0.8)	(0.6)
Operating income (loss)			0.8	0.6
Other expenses (income):
Interest expense			(305.5)	(197.4)
Interest and other income			305.2	197.1
Loss on extinguishment of debt			0.0
Total other expenses (income)			(0.3)	(0.3)
Income (loss) before equity interests and income taxes			1.1	0.9
Equity interests income (loss)			(347.1)	71.9
Gain on sale of equity interest in EPIX			0.0
Income (loss) before income taxes			(346.0)	72.8
Income tax benefit			(126.0)	(9.5)
Net income (loss)			(220.0)	82.3
Less: Net (income) loss attributable to noncontrolling interests			0.0	0.3
Net income (loss) attributable to Lions Gate Entertainment Corp. shareholders			(220.0)	82.6
Convertible Senior Subordinated Notes \| Lions Gate Entertainment Corp.
Revenues			0.0	0.0
Expenses:
Direct operating			0.0	0.0
Distribution and marketing			0.0	0.0
General and administration			2.0	0.8
Depreciation and amortization			0.0	0.0
Restructuring and other			1.8	0.5
Total expenses			3.8	1.3
Operating income (loss)			(3.8)	(1.3)
Other expenses (income):
Interest expense			68.9	22.9
Interest and other income			(215.9)	(107.8)
Loss on extinguishment of debt			17.0
Total other expenses (income)			(130.0)	(84.9)
Income (loss) before equity interests and income taxes			126.2	83.6
Equity interests income (loss)			47.8	(96.9)
Gain on sale of equity interest in EPIX			0.0
Income (loss) before income taxes			174.0	(13.3)
Income tax benefit			(15.3)	2.9
Net income (loss)			189.3	(16.2)
Less: Net (income) loss attributable to noncontrolling interests			0.0	0.0
Net income (loss) attributable to Lions Gate Entertainment Corp. shareholders			189.3	(16.2)
Convertible Senior Subordinated Notes \| Lions Gate Entertainment Inc.
Revenues			3.3	8.8
Expenses:
Direct operating			0.0	1.5
Distribution and marketing			0.5	0.5
General and administration			85.7	79.1
Depreciation and amortization			5.1	5.9
Restructuring and other			10.4	13.3
Total expenses			101.7	100.3
Operating income (loss)			(98.4)	(91.5)
Other expenses (income):
Interest expense			110.0	114.1
Interest and other income			0.0	0.0
Loss on extinguishment of debt			1.0
Total other expenses (income)			111.0	114.1
Income (loss) before equity interests and income taxes			(209.4)	(205.6)
Equity interests income (loss)			287.5	24.2
Gain on sale of equity interest in EPIX			0.0
Income (loss) before income taxes			78.1	(181.4)
Income tax benefit			30.3	(84.5)
Net income (loss)			47.8	(96.9)
Less: Net (income) loss attributable to noncontrolling interests			0.0	0.0
Net income (loss) attributable to Lions Gate Entertainment Corp. shareholders			47.8	(96.9)
Convertible Senior Subordinated Notes \| Non-guarantor Subsidiaries
Revenues			1,942.8	1,184.3
Expenses:
Direct operating			1,076.4	751.7
Distribution and marketing			432.1	346.5
General and administration			136.4	65.5
Depreciation and amortization			74.2	4.1
Restructuring and other			2.2	4.5
Total expenses			1,721.3	1,172.3
Operating income (loss)			221.5	12.0
Other expenses (income):
Interest expense			227.6	91.5
Interest and other income			(94.8)	(91.5)
Loss on extinguishment of debt			0.0
Total other expenses (income)			132.8	0.0
Income (loss) before equity interests and income taxes			88.7	12.0
Equity interests income (loss)			(9.2)	13.5
Gain on sale of equity interest in EPIX			201.0
Income (loss) before income taxes			280.5	25.5
Income tax benefit			110.2	11.2
Net income (loss)			170.3	14.3
Less: Net (income) loss attributable to noncontrolling interests			1.9	0.0
Net income (loss) attributable to Lions Gate Entertainment Corp. shareholders			$ 172.2	$ 14.3

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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