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Regulatory Capital Requirements Of HRB Bank (HRB Bank's Regulatory Capital Requirements) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Apr. 30, 2012
Apr. 05, 2012
Mar. 31, 2012
Mar. 31, 2011
Regulatory Capital Requirements Of HRB Bank [Abstract]        
Total risk-based capital ratio, Amount     $ 458,860 [1] $ 405,000 [1]
Total risk-based capital ratio     120.30% [1] 92.50% [1]
Total risk-based capital ratio, Minimum Capital Requirement, Amount     30,513 [1] 35,019 [1]
Total risk-based capital ratio, Minimum Capital Requirement, Ratio     8.00% [1] 8.00% [1]
Total risk-based capital ratio, Minimum to be Well Capitalized, Amount     38,141 [1] 43,773 [1]
Total risk-based capital ratio, Minimum to be Well Capitalized, Ratio     10.00% [1] 10.00% [1]
Tier 1 risk-based capital ratio, Amount     453,800 [2] 399,187 [1]
Tier 1 risk-based capital ratio     119.00% [2] 91.20% [1]
Tier 1 risk-based capital ratio, Minimum to be Well Capitalized, Amount     22,885 [2] 26,264 [1]
Tier 1 risk-based capital ratio, Minimum to be Well Capitalized, Ratio     6.00% [2] 6.00% [1]
Tier 1 capital ratio (leverage), Amount     453,800 [3] 399,187 [2]
Tier 1 capital ratio (leverage)     29.40% [3] 22.80% [2]
Tier 1 capital ratio (leverage), Minimum Capital Requirement, Amount     185,252 [3] 209,758 [2]
Tier 1 capital ratio (leverage), Minimum Capital Requirement, Ratio   4.00% 12.00% [3],[4] 12.00% [2]
Tier 1 capital ratio (leverage), Minimum to be Well Capitalized, Amount     77,188 [3] 87,399 [2]
Tier 1 capital ratio (leverage), Minimum to be Well Capitalized, Ratio     5.00% [3] 5.00% [2]
Tangible equity ratio, Amount     453,800 [5] 399,187 [3]
Tangible equity ratio     29.40% [5] 22.80% [3]
Tangible equity ratio, Minimum Capital Requirement, Amount     $ 23,157 [5] $ 26,220 [3]
Tangible equity ratio, Minimum Capital Requirement, Ratio     1.50% [5] 1.50% [3]
Minimum leverage capital per calendar quarter 12.00%      
[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] Tier 1 (core) capital divided by adjusted total assets.
[4] Effective April 5, 2012, the minimum capital requirement was changed to 4% by the OCC, although HRB Bank plans to maintain a minimum of 12.0% leverage capital at the end of each calendar quarter.
[5] Tangible capital divided by tangible assets.