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v3.19.2

Description of Business, Basis of Presentation, and Significant Accounting Policies (Estimated Useful Lives of Depreciable Assets) (Details) | 12 Months Ended
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May 31, 2019
Leasehold Improvements [Member] |
Property, Plant and Equipment [Line Items] |
Estimated useful lives | 10 years
Minimum [Member] | Buildings and Improvements [Member] |
Property, Plant and Equipment [Line Items] |
Estimated useful lives | 10 years
Minimum [Member] | Data Processing Equipment [Member] |
Property, Plant and Equipment [Line Items] |
Estimated useful lives | 3 years
Minimum [Member] | Furniture, Fixtures, and Equipment [Member] |
Property, Plant and Equipment [Line Items] |
Estimated useful lives | 2 years
Maximum [Member] | Buildings and Improvements [Member] |
Property, Plant and Equipment [Line Items] |
Estimated useful lives | 35 years
Maximum [Member] | Data Processing Equipment [Member] |
Property, Plant and Equipment [Line Items] |
Estimated useful lives | 4 years
Maximum [Member] | Furniture, Fixtures, and Equipment [Member] |
Property, Plant and Equipment [Line Items] |
Estimated useful lives | 7 years

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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
Name: | us-gaap_PropertyPlantAndEquipmentLineItems
Namespace Prefix: | us-gaap_
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
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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: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_BuildingAndBuildingImprovementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=payx_FurnitureFixturesAndEquipmentMember
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: |