Leases - Additional Information (Detail) $ in Millions	Dec. 30, 2022 USD ($)
Leases [Abstract]
Minimum lease payments	$ 98.8

Lessee operating lease liability not yet commenced.

No definition available.

Name:	uctt_LesseeOperatingLeaseLiabilityNotYetCommenced
Namespace Prefix:	uctt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant