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Stock-Based Compensation (Assumptions Used To Value Options) (Details) (USD $)
 12 Months Ended
Apr. 30, 2015
Apr. 30, 2014
Apr. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected term, years 3 years 3 years 3 years
Espp      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected volatility, minimum    22.32%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum
/ us-gaap_AwardTypeAxis
= hrb_EsppMember		  
Expected volatility, maximum    27.39%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum
/ us-gaap_AwardTypeAxis
= hrb_EsppMember		  
Dividend yield, minimum    4.20%hrb_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsDividendYieldRateMinimum
/ us-gaap_AwardTypeAxis
= hrb_EsppMember		  
Dividend yield, maximum    5.00%hrb_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsDividendYieldRateMaximum
/ us-gaap_AwardTypeAxis
= hrb_EsppMember		  
Risk-free interest rate, minimum    0.11%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum
/ us-gaap_AwardTypeAxis
= hrb_EsppMember		  
Risk-free interest rate, maximum    0.15%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum
/ us-gaap_AwardTypeAxis
= hrb_EsppMember		  
Stock Options For Management And Director      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected volatility, minimum 0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum
/ us-gaap_AwardTypeAxis
= hrb_StockOptionsForManagementAndDirectorMember		 30.89%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum
/ us-gaap_AwardTypeAxis
= hrb_StockOptionsForManagementAndDirectorMember		 29.69%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum
/ us-gaap_AwardTypeAxis
= hrb_StockOptionsForManagementAndDirectorMember
Expected volatility, maximum 26.25%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum
/ us-gaap_AwardTypeAxis
= hrb_StockOptionsForManagementAndDirectorMember		 31.57%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum
/ us-gaap_AwardTypeAxis
= hrb_StockOptionsForManagementAndDirectorMember		 31.43%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum
/ us-gaap_AwardTypeAxis
= hrb_StockOptionsForManagementAndDirectorMember
Expected term, years 4 years 4 years  
Dividend yield, minimum 0.00%hrb_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsDividendYieldRateMinimum
/ us-gaap_AwardTypeAxis
= hrb_StockOptionsForManagementAndDirectorMember		 2.77%hrb_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsDividendYieldRateMinimum
/ us-gaap_AwardTypeAxis
= hrb_StockOptionsForManagementAndDirectorMember		 4.18%hrb_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsDividendYieldRateMinimum
/ us-gaap_AwardTypeAxis
= hrb_StockOptionsForManagementAndDirectorMember
Dividend yield, maximum 2.62%hrb_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsDividendYieldRateMaximum
/ us-gaap_AwardTypeAxis
= hrb_StockOptionsForManagementAndDirectorMember		 2.87%hrb_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsDividendYieldRateMaximum
/ us-gaap_AwardTypeAxis
= hrb_StockOptionsForManagementAndDirectorMember		 5.21%hrb_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsDividendYieldRateMaximum
/ us-gaap_AwardTypeAxis
= hrb_StockOptionsForManagementAndDirectorMember
Risk-free interest rate, minimum 0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum
/ us-gaap_AwardTypeAxis
= hrb_StockOptionsForManagementAndDirectorMember		 1.06%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum
/ us-gaap_AwardTypeAxis
= hrb_StockOptionsForManagementAndDirectorMember		 0.61%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum
/ us-gaap_AwardTypeAxis
= hrb_StockOptionsForManagementAndDirectorMember
Risk-free interest rate, maximum 1.43%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum
/ us-gaap_AwardTypeAxis
= hrb_StockOptionsForManagementAndDirectorMember		 1.31%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum
/ us-gaap_AwardTypeAxis
= hrb_StockOptionsForManagementAndDirectorMember		 0.75%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum
/ us-gaap_AwardTypeAxis
= hrb_StockOptionsForManagementAndDirectorMember
Weighted-average fair value 5.18us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= hrb_StockOptionsForManagementAndDirectorMember		 5.57us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= hrb_StockOptionsForManagementAndDirectorMember		 2.79us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= hrb_StockOptionsForManagementAndDirectorMember
Performance Nonvested Share Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected volatility, minimum 12.28%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum
/ us-gaap_AwardTypeAxis
= hrb_PerformanceNonvestedShareUnitsMember		 11.75%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum
/ us-gaap_AwardTypeAxis
= hrb_PerformanceNonvestedShareUnitsMember		 12.61%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum
/ us-gaap_AwardTypeAxis
= hrb_PerformanceNonvestedShareUnitsMember
Expected volatility, maximum 78.42%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum
/ us-gaap_AwardTypeAxis
= hrb_PerformanceNonvestedShareUnitsMember		 70.17%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum
/ us-gaap_AwardTypeAxis
= hrb_PerformanceNonvestedShareUnitsMember		 71.96%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum
/ us-gaap_AwardTypeAxis
= hrb_PerformanceNonvestedShareUnitsMember
Dividend yield, minimum 0.00%hrb_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsDividendYieldRateMinimum
/ us-gaap_AwardTypeAxis
= hrb_PerformanceNonvestedShareUnitsMember		 [1] 0.00%hrb_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsDividendYieldRateMinimum
/ us-gaap_AwardTypeAxis
= hrb_PerformanceNonvestedShareUnitsMember		 [1]  
Dividend yield, maximum 2.39%hrb_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsDividendYieldRateMaximum
/ us-gaap_AwardTypeAxis
= hrb_PerformanceNonvestedShareUnitsMember		 [1] 2.88%hrb_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsDividendYieldRateMaximum
/ us-gaap_AwardTypeAxis
= hrb_PerformanceNonvestedShareUnitsMember		 [1]  
Risk-free interest rate 0.81%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_AwardTypeAxis
= hrb_PerformanceNonvestedShareUnitsMember		 0.61%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_AwardTypeAxis
= hrb_PerformanceNonvestedShareUnitsMember		 0.40%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_AwardTypeAxis
= hrb_PerformanceNonvestedShareUnitsMember
Weighted-average fair value 37.17us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= hrb_PerformanceNonvestedShareUnitsMember		 28.59us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= hrb_PerformanceNonvestedShareUnitsMember		 16.72us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= hrb_PerformanceNonvestedShareUnitsMember
Minimum | Stock Options For Management And Director      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected term, years   4 years 4 years
Maximum | Stock Options For Management And Director      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected term, years 4 years 4 years 5 years
[1] The valuation model assumes that dividends are reinvested by the Company on a continuous basis.