Regulatory Capital Requirements (HRB Bank's Regulatory Capital Requirements) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Oct. 31, 2014	Sep. 30, 2014		Apr. 30, 2014	Mar. 31, 2014		Sep. 30, 2013
Banking and Thrift [Abstract]
Total risk-based capital ratio, Amount		$ 595,148	[1]		$ 563,899	[1]	$ 506,449	[1]
Total risk-based capital ratio		199.40%	[1]		168.50%	[1]	140.00%	[1]
Total risk-based capital ratio, Minimum Capital Requirement, Amount		23,877	[1]		26,771	[1]	28,950	[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		29,846	[1]		33,464	[1]	36,188	[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		591,293	[2]		559,572	[2]	501,720	[2]
Tier 1 risk-based capital ratio		198.10%	[2]		167.20%	[2]	138.60%	[2]
Tier 1 risk-based capital ratio, Minimum to be Well Capitalized, Amount		17,908	[2]		20,079	[2]	21,713	[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		591,293	[3]		559,572	[3]	501,720	[3]
Tier 1 capital ratio (leverage)		54.30%	[3]		32.10%	[3]	40.40%	[3]
Tier 1 capital ratio (leverage), Minimum Capital Requirement, Amount		130,689	[3]		209,041	[3]	148,869	[3]
Tier 1 capital ratio (leverage), Minimum Capital Requirement, Ratio		12.00%	[3],[4]	4.00%	12.00%	[3],[4]	12.00%	[3]
Tier 1 capital ratio (leverage), Minimum to be Well Capitalized, Amount		54,454	[3]		87,101	[3]	62,029	[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		591,293	[5]		559,572	[5]	501,720	[5]
Tangible equity ratio		54.30%	[5]		32.10%	[5]	40.40%	[5]
Tangible equity ratio, Minimum Capital Requirement, Amount		$ 16,336	[5]		$ 26,130	[5]	$ 18,609	[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.