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Due To/From LG Studios Business - Narrative (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended		12 Months Ended
	May 13, 2024	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Mar. 31, 2024	Mar. 31, 2025
Related Party Transaction [Line Items]
Due to LGCH1		$ 0.0		$ 0.0			$ 81.6
General and administrative		$ 28.8	$ 26.3	$ 57.9	$ 52.9
Segment Reporting, Reconciling Item, Corporate Nonsegment | Related Party
Related Party Transaction [Line Items]
General and administrative			$ 2.5		$ 6.1
Business separation cost						$ 10.0
Intercompany Revolver | Revolving Credit Facility
Related Party Transaction [Line Items]
Debt maximum covenant amount	$ 150.0
Debt instrument, basis spread on variable rate	1.75%
Intercompany Revolver | Revolving Credit Facility | Related Party
Related Party Transaction [Line Items]
Due to LGCH1							$ 81.6

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