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Regulatory Capital Requirements Of HRB Bank (HRB Bank's Regulatory Capital Requirements) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2012
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
Total risk-based capital ratio, Amount $ 654,053us-gaap_Capital [1] $ 563,899us-gaap_Capital [1]  
Total risk-based capital ratio 236.00%us-gaap_CapitalToRiskWeightedAssets [1] 168.50%us-gaap_CapitalToRiskWeightedAssets [1]  
Total risk-based capital ratio, Minimum Capital Requirement, Amount 22,173us-gaap_CapitalRequiredForCapitalAdequacy [1] 26,771us-gaap_CapitalRequiredForCapitalAdequacy [1]  
Total risk-based capital ratio, Minimum Capital Requirement, Ratio   8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets [1]  
Total risk-based capital ratio, Minimum to be Well Capitalized, Amount 27,716us-gaap_CapitalRequiredToBeWellCapitalized [1] 33,464us-gaap_CapitalRequiredToBeWellCapitalized [1]  
Total risk-based capital ratio, Minimum to be Well Capitalized, Ratio 10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets [1] 10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets [1] 10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
Tier 1 risk-based capital ratio, Amount 650,487us-gaap_TierOneRiskBasedCapital [2] 559,572us-gaap_TierOneRiskBasedCapital [2]  
Tier 1 risk-based capital ratio 234.70%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets [2] 167.20%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets [2]  
Tier One Risk Based Capital Required for Capital Adequacy 16,630us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy    
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets 6.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets    
Tier 1 risk-based capital ratio, Minimum to be Well Capitalized, Amount 22,173us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized [2] 20,079us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized [2]  
Tier 1 risk-based capital ratio, Minimum to be Well Capitalized, Ratio 8.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets [2] 6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets [2] 8.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
Tier 1 capital ratio (leverage), Minimum Capital Requirement, Amount 12,472us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy [3] 209,041us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy [3]  
Tier 1 capital ratio (leverage), Minimum Capital Requirement, Ratio 4.50%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets [3],[4] 12.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets [3],[4]  
Tier 1 capital ratio (leverage), Minimum to be Well Capitalized, Amount 18,016us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized [3] 87,101us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized [3]  
Tier 1 capital ratio (leverage), Minimum to be Well Capitalized, Ratio 6.50%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets [3] 5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets [3] 5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets
Tier 1 capital ratio (leverage), Amount 650,487us-gaap_TierOneLeverageCapital [3] 559,572us-gaap_TierOneLeverageCapital [3]  
Tier 1 capital ratio (leverage) 34.70%us-gaap_TierOneLeverageCapitalToAverageAssets [3] 32.10%us-gaap_TierOneLeverageCapitalToAverageAssets [3]  
Tangible equity ratio, Minimum Capital Requirement, Amount 74,953us-gaap_TangibleCapitalRequiredForCapitalAdequacy [5] 26,130us-gaap_TangibleCapitalRequiredForCapitalAdequacy [5]  
Tangible equity ratio, Minimum Capital Requirement, Ratio 4.00%us-gaap_TangibleCapitalRequiredForCapitalAdequacyToTangibleAssets [5] 1.50%us-gaap_TangibleCapitalRequiredForCapitalAdequacyToTangibleAssets [5]  
Tangible Capital Required to be Well Capitalized 93,692hrb_TangibleCapitalRequiredtobeWellCapitalized [3]    
Tangible Capital Required to be Well Capitalized Divided by Average Assets 5.00%hrb_TangibleCapitalRequiredtobeWellCapitalizedDividedbyAverageAssets [3]    
Tangible equity ratio, Amount   559,572us-gaap_TangibleCapital [5]  
Tangible equity ratio   32.10%us-gaap_TangibleCapitalToTangibleAssets [5]  
Parent Company      
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
Total risk-based capital ratio, Amount 1,059,040us-gaap_Capital
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		 [1]    
Total risk-based capital ratio 62.00%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		 [1]    
Total risk-based capital ratio, Minimum Capital Requirement, Amount 136,713us-gaap_CapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		 [1]    
Total risk-based capital ratio, Minimum Capital Requirement, Ratio 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		 [1]    
Tier 1 risk-based capital ratio, Amount 1,037,423us-gaap_TierOneRiskBasedCapital
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		 [2]    
Tier 1 risk-based capital ratio 60.70%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		 [2]    
Tier One Risk Based Capital Required for Capital Adequacy 102,535us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		    
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets 6.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		    
Tier 1 capital ratio (leverage), Minimum Capital Requirement, Amount 76,901us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		 [3]    
Tier 1 capital ratio (leverage), Minimum Capital Requirement, Ratio 4.50%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		 [3],[4]    
Tier 1 capital ratio (leverage), Amount 1,037,423us-gaap_TierOneLeverageCapital
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		 [3]    
Tier 1 capital ratio (leverage) 28.30%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		 [3]    
Tangible equity ratio, Minimum Capital Requirement, Amount $ 146,839us-gaap_TangibleCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		 [5]    
Tangible equity ratio, Minimum Capital Requirement, Ratio 4.00%us-gaap_TangibleCapitalRequiredForCapitalAdequacyToTangibleAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		 [5]    
[1] Total risk-based capital divided by risk-weighted assets.
[2] Tier 1 (core) capital less deduction for low-level recourse and residual interest divided by risk-weighted assets.
[3] {F|ahBzfndlYmZpbGluZ3MtaHJkcmoLEgZYTUxEb2MiXlhCUkxEb2NHZW5JbmZvOjVkYjkyOTY3MTRhZTQxMjc5NTNiYWI3MmM5ZTgxZmM0fFRleHRTZWxlY3Rpb246RjY5RTZCMzdGOTk0QzA4QkJCREZENDQ4RTgyQUEwMzEM}
[4] {F|ahBzfndlYmZpbGluZ3MtaHJkcmoLEgZYTUxEb2MiXlhCUkxEb2NHZW5JbmZvOjVkYjkyOTY3MTRhZTQxMjc5NTNiYWI3MmM5ZTgxZmM0fFRleHRTZWxlY3Rpb246RTZCNzZFQkU4Mzg0Njc0QTlFN0FENDQ4RTgyQTQxNzAM}
[5] divided by average assets.