Segment Information - Reconciliation Of Total Segment Profit To The Company's Loss Before Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023
Segment Reporting Information [Line Items]
Company’s total segment profit	$ 444.1	$ 466.2	$ 409.9
Adjusted depreciation and amortization	(13.6)	(10.5)	(12.2)
Restructuring and other	(102.6)	(132.9)	(27.2)
Adjusted share-based compensation expense	(29.1)	(39.8)	(42.5)
Operating income	124.6	139.7	139.6
Interest expense	(242.5)	(222.5)	(162.6)
Interest and other income	14.8	19.2	6.4
Gain (loss) on extinguishment of debt	(1.8)	(1.3)	(1.3)
Gain on investments, net	0.0	3.5	44.0
Equity interests loss	4.3	8.7	0.5
Income (loss) before income taxes	(112.4)	(72.7)	5.4
Lions Gate Entertainment Corp.
Segment Reporting Information [Line Items]
Company’s total segment profit	589.9	653.7	481.0
Adjusted depreciation and amortization	(33.8)	(50.1)	(40.2)
Restructuring and other	(253.5)	(508.5)	(411.9)
Goodwill and intangible asset impairment	0.0	(663.9)	(1,475.0)
Adjusted share-based compensation expense	(69.0)	(81.2)	(97.8)
Operating income	(68.1)	(938.8)	(1,857.7)
Interest expense	(283.6)	(269.8)	(221.2)
Interest and other income	15.1	22.1	6.4
Other gains (losses), net	(19.0)	(26.9)	(26.9)
Gain (loss) on extinguishment of debt	(7.5)	19.9	57.4
Gain on investments, net	0.0	3.5	44.0
Equity interests loss	4.3	8.7	0.5
Income (loss) before income taxes	(358.8)	(1,181.3)	(1,997.5)
Operating Segments
Segment Reporting Information [Line Items]
Company’s total segment profit	444.1	466.2	409.9
Operating Segments | Lions Gate Entertainment Corp.
Segment Reporting Information [Line Items]
Company’s total segment profit	589.9	653.7	481.0
Corporate
Segment Reporting Information [Line Items]
Corporate general and administrative expenses	(120.9)	(110.6)	(100.9)
Corporate | Lions Gate Entertainment Corp.
Segment Reporting Information [Line Items]
Corporate general and administrative expenses	(123.2)	(136.1)	(122.9)
Corporate and Reconciling Items
Segment Reporting Information [Line Items]
Adjusted depreciation and amortization	(13.6)	(10.5)	(12.2)
Restructuring and other	(102.6)	(132.9)	(27.2)
COVID-19 related charges included in direct operating expense and distribution and marketing expense	2.1	0.9	8.9
Content charges	0.0	(1.5)	(8.1)
Purchase accounting and related adjustments	(12.9)	(17.1)	(61.6)
Corporate and Reconciling Items | Lions Gate Entertainment Corp.
Segment Reporting Information [Line Items]
Adjusted depreciation and amortization	(33.8)	(50.1)	(40.2)
Restructuring and other	(253.5)	(508.5)	(411.9)
Goodwill and intangible asset impairment	0.0	(663.9)	(1,475.0)
COVID-19 related charges included in direct operating expense and distribution and marketing expense	3.1	1.0	11.6
Content charges	0.0	0.0	(7.0)
Unallocated rent cost included in direct operating expense	(18.6)	0.0	0.0
Adjusted share-based compensation expense	(69.0)	(81.2)	(97.8)
Purchase accounting and related adjustments	$ (163.0)	$ (153.7)	$ (195.5)