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Income Taxes - Deferred Tax Asset Valuation Allowance (Details) - USD ($)	12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023
Deferred Tax Asset, Valuation Allowance
Beginning balance	$ 141,300,000	$ 92,200,000	$ 25,400,000
Changes in valuation allowance	37,200,000	41,300,000	66,800,000
Other	(1,000,000.0)	7,800,000	0
Ending balance	$ 177,500,000	$ 141,300,000	$ 92,200,000

X

- Definition

Deferred Tax Asset, Valuation Allowance, Adjustments Related To Discontinued Operations

+ References

No definition available.

+ Details

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Namespace Prefix:	starz_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Deferred Tax Asset, Valuation Allowance

+ References

No definition available.

+ Details

Name:	starz_DeferredTaxAssetValuationAllowanceRollForward
Namespace Prefix:	starz_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-2

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-2

+ Details

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