Segment Information - Segment Information (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023
Segment Reporting Information [Line Items]
Segment revenues	$ 3,195.5	$ 2,986.4	$ 3,083.8
Gross contribution	606.1	638.0	571.6
Segment general and administrative expenses	162.0	171.8	161.7
Segment profit	444.1	466.2	409.9
Lions Gate Entertainment Corp.
Segment Reporting Information [Line Items]
Segment revenues	3,947.9	4,016.9	3,854.8
Segment direct operating expenses	2,333.7	2,187.4	2,314.7
Gross contribution	838.1	918.9	739.1
Segment general and administrative expenses	248.2	265.2	258.1
Segment profit	589.9	653.7	481.0
Motion Picture
Segment Reporting Information [Line Items]
Segment revenues	1,589.7	1,656.3	1,323.7
Gross contribution	407.7	433.3	386.3
Segment general and administrative expenses	100.1	113.9	109.8
Segment profit	307.6	319.4	276.5
Television Production
Segment Reporting Information [Line Items]
Segment revenues	1,605.8	1,330.1	1,760.1
Gross contribution	198.4	204.7	185.3
Segment general and administrative expenses	61.9	57.9	51.9
Segment profit	136.5	146.8	133.4
Reportable Segments
Segment Reporting Information [Line Items]
Segment general and administrative expenses	162.0	171.8	161.7
Segment profit	444.1	466.2	409.9
Reportable Segments | Lions Gate Entertainment Corp.
Segment Reporting Information [Line Items]
Segment distribution and marketing	776.1	910.6	801.0
Segment general and administrative expenses	248.2	265.2	258.1
Segment profit	589.9	653.7	481.0
Reportable Segments | Studio Business | Lions Gate Entertainment Corp.
Segment Reporting Information [Line Items]
Segment revenues	3,195.5	2,986.4	3,083.8
Segment direct operating expenses	2,193.5	1,886.1	2,208.0
Segment distribution and marketing	395.9	462.3	304.2
Gross contribution	606.1	638.0	571.6
Segment general and administrative expenses	162.0	171.8	161.7
Segment profit	444.1	466.2	409.9
Reportable Segments | Motion Picture
Segment Reporting Information [Line Items]
Segment revenues	1,589.7	1,656.3	1,323.7
Reportable Segments | Motion Picture | Lions Gate Entertainment Corp.
Segment Reporting Information [Line Items]
Segment revenues	1,589.7	1,656.3	1,323.7
Segment direct operating expenses	824.2	796.0	666.5
Segment distribution and marketing	357.8	427.0	270.9
Gross contribution	407.7	433.3	386.3
Segment general and administrative expenses	100.1	113.9	109.8
Segment profit	307.6	319.4	276.5
Reportable Segments | Television Production
Segment Reporting Information [Line Items]
Segment revenues	1,605.8	1,330.1	1,760.1
Reportable Segments | Television Production | Lions Gate Entertainment Corp.
Segment Reporting Information [Line Items]
Segment revenues	1,605.8	1,330.1	1,760.1
Segment direct operating expenses	1,369.3	1,090.1	1,541.5
Segment distribution and marketing	38.1	35.3	33.3
Gross contribution	198.4	204.7	185.3
Segment general and administrative expenses	61.9	57.9	51.9
Segment profit	136.5	146.8	133.4
Reportable Segments | Media Networks | Lions Gate Entertainment Corp.
Segment Reporting Information [Line Items]
Segment revenues	1,372.1	1,576.4	1,546.5
Segment direct operating expenses	702.1	795.5	846.8
Segment distribution and marketing	381.0	451.1	496.5
Gross contribution	289.0	329.8	203.2
Segment general and administrative expenses	86.2	93.4	96.4
Segment profit	202.8	236.4	106.8
Intersegment Eliminations | Lions Gate Entertainment Corp.
Segment Reporting Information [Line Items]
Segment revenues	(619.7)	(545.9)	(775.5)
Segment direct operating expenses	(561.9)	(494.2)	(740.1)
Segment distribution and marketing	(0.8)	(2.8)	0.3
Gross contribution	(57.0)	(48.9)	(35.7)
Segment profit	(57.0)	(48.9)	(35.7)
Intersegment Eliminations | Studio Business | Lions Gate Entertainment Corp.
Segment Reporting Information [Line Items]
Segment revenues	(619.7)	(545.9)	(775.5)
Intersegment Eliminations | Motion Picture | Lions Gate Entertainment Corp.
Segment Reporting Information [Line Items]
Segment revenues	(203.3)	(128.2)	(44.2)
Intersegment Eliminations | Television Production | Lions Gate Entertainment Corp.
Segment Reporting Information [Line Items]
Segment revenues	(416.4)	(417.7)	(731.3)
Intersegment Eliminations | Media Networks | Lions Gate Entertainment Corp.
Segment Reporting Information [Line Items]
Segment revenues	$ 0.0	$ 0.0	$ 0.0