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Commitments And Contingencies (Claims Received By Loan Origination Year) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Apr. 30, 2012 | Jan. 31, 2012 | Oct. 31, 2011 | Jul. 31, 2011 | Apr. 30, 2011 | Jan. 31, 2011 | Oct. 31, 2010 | Jul. 31, 2010 | Apr. 30, 2010 | Jan. 31, 2010 | Oct. 31, 2009 | Jul. 31, 2009 | Apr. 30, 2009
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Claims received for loans | $ 1,344 | $ 35 | $ 483 | $ 31 | $ 55 | $ 33 | $ 21 | $ 109 | $ 45 | $ 11 | $ 83 | $ 6 | $ 432
2005 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Claims received for loans | 89 | 4 |  |  | 1 |  | 1 | 6 |  |  | 15 |  | 62
2006 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Claims received for loans | 707 | 29 | 130 | 29 | 50 | 29 | 15 | 100 | 45 | 4 | 57 | 2 | 217
2007 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Claims received for loans | $ 548 | $ 2 | $ 353 | $ 2 | $ 4 | $ 4 | $ 5 | $ 3 |  | $ 7 | $ 11 | $ 4 | $ 153

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- Definition Claims received for loans + References No definition available. + Details
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Namespace Prefix: | hrb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: | hrb_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration