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v3.21.2

Summary of Significant Accounting Policies - Estimated Useful Lives (Details) | 12 Months Ended
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Jun. 30, 2021
Data processing equipment | Minimum |
Accounting Policies [Line Items] |
Property, plant and equipment, useful life | 5 years
Data processing equipment | Maximum |
Accounting Policies [Line Items] |
Property, plant and equipment, useful life | 10 years
Buildings | Minimum |
Accounting Policies [Line Items] |
Property, plant and equipment, useful life | 20 years
Buildings | Maximum |
Accounting Policies [Line Items] |
Property, plant and equipment, useful life | 40 years
Furniture and fixtures | Minimum |
Accounting Policies [Line Items] |
Property, plant and equipment, useful life | 4 years
Furniture and fixtures | Maximum |
Accounting Policies [Line Items] |
Property, plant and equipment, useful life | 7 years

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- Definition Accounting Policies [Line Items] + References No definition available. + Details
Name: | adp_AccountingPoliciesLineItems
Namespace Prefix: | adp_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentUsefulLife
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=adp_DataProcessingEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_BuildingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_FurnitureAndFixturesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |