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Debt - Additional Information (Details) - PREDECESSOR MILLROSE BUSINESS [Member] - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Line of Credit Facility [Line Items]
Debt	$ 24,188	$ 32,607
Debt Instrument, Interest rate, Effective percentage	0.00%

X

- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

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Balance Type:	na
Period Type:	instant

X

- Definition

Represents the aggregate of total long-term debt, including current maturities and short-term debt.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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-Topic 470
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- Details

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Namespace Prefix:
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Balance Type:
Period Type: