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Short-term Financing (Description of Credit Facilities) (Details) $ in Millions | 9 Months Ended
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Feb. 28, 2018 USD ($) | [1]
Paychex of New York, LLC [Member] | JP Morgan Chase Bank, N.A. [Member] | JPM $1 Billion Credit Facility [Member] |  |
Line of Credit Facility [Line Items] |  |
Date Entered | Aug. 05, 2015 | [2]
Expiration Date | Aug. 05, 2020 | [2]
Maximum Amount Available | $ 1,000 | [2]
Paychex of New York, LLC [Member] | JP Morgan Chase Bank, N.A. [Member] | JPM $500 Million Credit Facility [Member] |  |
Line of Credit Facility [Line Items] |  |
Date Entered | Aug. 17, 2017 | [2]
Expiration Date | Aug. 17, 2022 | [2]
Maximum Amount Available | $ 500 | [2]
Paychex Advance, LLC [Member] | PNC Bank, National Association [Member] | PNC $150 Million Credit Facility [Member] |  |
Line of Credit Facility [Line Items] |  |
Date Entered | Mar. 17, 2016 |
Expiration Date | Mar. 17, 2020 |
Maximum Amount Available | $ 150 |
[1] | Borrower is a wholly owned subsidiary of the Company.
[2] | JP Morgan Chase Bank, N.A. ("JPM") acts as the administrative agent for this syndicated credit facility.

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- Definition Date the credit facility terminates, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Date the credit facility first became available, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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