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Regulatory Capital Requirements Of HRB Bank (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
0 Months Ended 12 Months Ended
Apr. 05, 2012
Apr. 30, 2012
Apr. 30, 2011
Apr. 30, 2010
Mar. 31, 2012
Mar. 31, 2011
Regulatory Capital Requirements Of HRB Bank [Abstract]            
Capital contributions to HRB Bank to meet capital requirements   $ 400.0 $ 235.0 $ 235.0    
Leverage ratio   0.348        
Minimum leverage ratio terminated 12.00%          
Minimum leverage capital per calendar quarter   12.00%        
Dividend and return of capital   $ 400        
Total risk-based capital ratio, well capitalized         10.00% [1] 10.00% [1]
Tier 1 Risk-based capital ratio         6.00% [2] 6.00% [1]
Tier 1 Risk-based leverage ratio         5.00% [3] 5.00% [2]
[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.