Summary of Significant Accounting Policies (Additional Information) (Details)	3 Months Ended
Jun. 30, 2026 Customer
Accounts Receivable [Member] \| Credit Concentration Risk [Member]
Number of customer	1

The number of individual customers accounting for more than the minimum threshold for the associated concentration risk percentage of an identified benchmark and type.

No definition available.

Name:	crvl_NumberOfCustomersWithConcentrationRisk
Namespace Prefix:	crvl_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration