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v3.21.1

Revenue Recognition (Additional Information) (Details) | 12 Months Ended
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Apr. 30, 2021
Peace of Mind® Extended Service Plan |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
Revenue, remaining performance obligation, expected timing of satisfaction, period | 60 months

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- Definition Revenue, Remaining Contract Liability, Period for Recognition + References No definition available. + Details
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Balance Type: | na
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | srt_ProductOrServiceAxis=hrb_PeaceofMindRevenuesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |