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Loss Contingencies Arising From Representations And Warranties Of Our Discontinued Mortgage Operations (Claims Received By Loan Origination Year) (Details) (USD $) In Millions, unless otherwise specified | 9 Months Ended | 12 Months Ended | 57 Months Ended
--- | --- | --- | ---
Jan. 31, 2013 | Apr. 30, 2012 | Apr. 30, 2011 | Apr. 30, 2010 | Apr. 30, 2009 | Jan. 31, 2013
Commitments And Contingencies [Line Items] |  |  |  |  |  |
Claims received for loans | $ 168 | $ 1,092 | $ 218 | $ 145 | $ 432 | $ 2,055
2005 [Member] |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |
Claims received for loans | 22 | 4 | 8 | 15 | 62 | 111
2006 [Member] |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |
Claims received for loans | 133 | 325 | 194 | 108 | 217 | 977
2007 [Member] |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |
Claims received for loans | $ 13 | $ 763 | $ 16 | $ 22 | $ 153 | $ 967

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

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