Business Combinations Intangible Assets Acquired (Details) - Customer relationships	6 Months Ended
Jun. 30, 2022
Minimum
Finite-Lived Intangible Assets, Gross [Abstract]
Estimated useful life (in years)	6 years
Maximum
Finite-Lived Intangible Assets, Gross [Abstract]
Estimated useful life (in years)	10 years

Useful life of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

Name:	prft_FiniteLivedIntangibleAssetAcquiredUsefulLife
Namespace Prefix:	prft_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration