Leases - Narrative (Details) $ in Millions	Mar. 31, 2023 USD ($)
Leases [Abstract]
Leases not yet commenced	$ 13.0

Lessee, Operating Lease, Leases Not Yet Commenced, Liability

No definition available.

Name:	ua_LesseeOperatingLeaseLeasesNotYetCommencedLiability
Namespace Prefix:	ua_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant