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Stock Based Compensation and Stock Options - Additional Information (Detail) (USD $)
3 Months Ended 9 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common stock grants 19,365,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant   19,365,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant  
Options expected forfeiture rate, percentage 12.12%crvl_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedForfeitureRate 12.40%crvl_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedForfeitureRate    
Recognized stock compensation expense     $ 1,594,000us-gaap_AllocatedShareBasedCompensationExpense $ 1,546,000us-gaap_AllocatedShareBasedCompensationExpense
Weighted-average grant-date fair value of options granted $ 14.22us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue $ 16.70us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue    
Employee [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Non-statutory stock options expiration period     5 years  
Director [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Non-statutory stock options expiration period     10 years  
Performance Based Options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Recognized stock compensation expense (30,000)us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
285,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
113,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
448,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
Minimum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Non-statutory stock options vesting period     1 year  
Maximum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Non-statutory stock options vesting period     36 months  
Time Based Options [Member] | Performance Based Options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Recognized stock compensation expense $ 432,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_PlanNameAxis
= crvl_TimeBasedOptionsMember
$ 676,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_PlanNameAxis
= crvl_TimeBasedOptionsMember
$ 1,594,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_PlanNameAxis
= crvl_TimeBasedOptionsMember
$ 1,546,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_PlanNameAxis
= crvl_TimeBasedOptionsMember
Vest One Year from Date of Grant [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting Percentage     25.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_VestingAxis
= us-gaap_ShareBasedCompensationAwardTrancheOneMember
 
Vest Ratably Each Month Over 36 Months [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting Percentage     75.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_VestingAxis
= us-gaap_ShareBasedCompensationAwardTrancheTwoMember