Regulatory Capital Requirements Of HRB Bank (HRB Bank's Regulatory Capital Requirements) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Oct. 31, 2013	Sep. 30, 2013		Mar. 31, 2013		Sep. 30, 2012		Apr. 05, 2012
Banking and Thrift [Abstract]
Total risk-based capital ratio, Amount		$ 506,449	[1]	$ 506,734	[1]	$ 462,454	[1]
Total risk-based capital ratio		140.00%	[1]	131.60%	[1]	128.20%	[1]
Total risk-based capital ratio, Minimum Capital Requirement, Amount		28,950	[1]	30,806	[1]	28,868	[1]
Total risk-based capital ratio, Minimum Capital Requirement, Ratio		8.00%	[1]	8.00%	[1]	8.00%	[1]
Total risk-based capital ratio, Minimum to be Well Capitalized, Amount		36,188	[1]	38,508	[1]	36,085	[1]
Total risk-based capital ratio, Minimum to be Well Capitalized, Ratio		10.00%	[1]	10.00%	[1]	10.00%	[1]
Tier 1 risk-based capital ratio, Amount		501,720	[2]	501,731	[2]	457,760	[2]
Tier 1 risk-based capital ratio		138.60%	[2]	130.30%	[2]	126.90%	[2]
Tier 1 risk-based capital ratio, Minimum to be Well Capitalized, Amount		21,713	[2]	23,105	[2]	21,651	[2]
Tier 1 risk-based capital ratio, Minimum to be Well Capitalized, Ratio		6.00%	[2]	6.00%	[2]	6.00%	[2]
Tier 1 capital ratio (leverage), Amount		501,720	[3]	501,731	[3]	457,760	[3]
Tier 1 capital ratio (leverage)		40.40%	[3]	25.50%	[3]	36.80%	[3]
Tier 1 capital ratio (leverage), Minimum Capital Requirement, Amount		148,869	[3]	236,315	[3]	49,696	[3]
Tier 1 capital ratio (leverage), Minimum Capital Requirement, Ratio		12.00%	[3],[4]	12.00%	[3],[4]	12.00%	[3]	4.00%
Tier 1 capital ratio (leverage), Minimum to be Well Capitalized, Amount		62,029	[3]	98,464	[3]	62,120	[3]
Tier 1 capital ratio (leverage), Minimum to be Well Capitalized, Ratio		5.00%	[3]	5.00%	[3]	5.00%	[3]
Tangible equity ratio, Amount		501,720	[5]	501,731	[5]	457,760	[5]
Tangible equity ratio		40.40%	[5]	25.50%	[5]	36.80%	[5]
Tangible equity ratio, Minimum Capital Requirement, Amount		$ 18,609	[5]	$ 29,539	[5]	$ 18,636	[5]
Tangible equity ratio, Minimum Capital Requirement, Ratio		1.50%	[5]	1.50%	[5]	1.50%	[5]
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.