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Funds Held for Clients and Corporate Investments (Classification of Investments on Consolidated Balance Sheets) (Details) - USD ($) $ in Millions	Aug. 31, 2025	May 31, 2025
Funds Held for Clients and Corporate Investments [Abstract]
Funds held for clients	$ 4,927.4	$ 4,813.3
Corporate investments	861.9	34.5
Total funds held for clients and corporate investments, Fair value	$ 5,789.3	$ 4,847.8

X

- Definition

Funds held for clients and corporate investments.

+ References

No definition available.

+ Details

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X

- Definition

Funds held for clients and corporate investments, fair value.

+ References

No definition available.

+ Details

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Namespace Prefix:	payx_
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X

- Definition

Carrying amount as of the balance sheet date of the funds held on behalf of others and that are expected to be liquidated within one year or the normal operating cycle, if longer. This does not include funds held under reinsurance agreements.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(8))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

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X

- Definition

Amount of investment in marketable security, classified as current.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(2))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

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