XML 73 R65.htm IDEA: XBRL DOCUMENT
v3.19.3

Note 10 - Losses and Loss Adjustment Expense Mortgage Insurance Reserve Assumptions (Details) - Primary Mortgage Product - Mortgage Insurance Segment | Sep. 30, 2019 | Sep. 30, 2018
--- | --- | ---
Default To Claim Rate Estimate, Gross, For New Defaults | 7.50% | 8.50%
Default To Claim Rate Estimate, Gross, For Pre-Foreclosure Stage Defaults | 65.00% |
Default To Claim Estimate, Gross, For Foreclosure Stage Defaults | 72.00% |

X
- Definition This concept represents the rate at which defaulted loans that have reached the stage where the foreclosure sale has been scheduled or held are expected to result in a claim. + References No definition available. + Details
Name: | rdn_DefaultToClaimEstimateGrossForForeclosureStageDefaults
Namespace Prefix: | rdn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition This concept represents the rate at which newly reported defaulted loans are expected to result in a claim. + References No definition available. + Details
Name: | rdn_DefaultToClaimRateEstimateGrossForNewDefaults
Namespace Prefix: | rdn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition This concept represents the rate at which defaulted loans that have not yet reached the foreclosure stage are expected to result in a claim. + References No definition available. + Details
Name: | rdn_DefaultToClaimRateEstimateGrossForPreForeclosureStageDefaults
Namespace Prefix: | rdn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | srt_ProductOrServiceAxis=rdn_PrimaryMortgageProductMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=rdn_MortgageInsuranceSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |