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Short-term Financing (Narrative) (Details) - USD ($) $ in Thousands |  |  |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Feb. 06, 2020 | Jul. 31, 2019 | Mar. 17, 2016 | Aug. 05, 2015 | Feb. 29, 2020 | Feb. 28, 2019 | Feb. 29, 2020 | Feb. 28, 2019 | May 31, 2019
JPM $1 Billion Credit Facility [Member] | JP Morgan Chase Bank, N.A. [Member] | Paychex of New York, LLC [Member] |  |  |  |  |  |  |  |  |  |
Financing [Line Items] |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity | [1],[2] |  |  |  |  | $ 1,000,000 |  | $ 1,000,000 |  |
Expiration date | [1],[2] |  |  |  |  |  |  | Jul. 31, 2024 |  |
JPM $500 Million Credit Facility [Member] | JP Morgan Chase Bank, N.A. [Member] | Paychex of New York, LLC [Member] |  |  |  |  |  |  |  |  |  |
Financing [Line Items] |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity | [1],[2] |  |  |  |  | 500,000 |  | $ 500,000 |  |
Expiration date | [1],[2] |  |  |  |  |  |  | Aug. 17, 2022 |  |
Revolving Credit Facility [Member] | JPM $1 Billion Credit Facility [Member] | Paychex of New York, LLC [Member] |  |  |  |  |  |  |  |  |  |
Financing [Line Items] |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  | $ 1,000,000 |  |  |  |  |  |  |
Term |  |  | 5 years |  |  |  |  |  |  |
Revolving Credit Facility [Member] | JPM $1 Billion Credit Facility [Member] | Paychex of New York, LLC [Member] |  |  |  |  |  |  |  |  |  |
Financing [Line Items] |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | $ 1,000,000 |  |  |  |  |
Term |  |  |  |  | 5 years |  |  |  |  |
Expiration date |  |  |  |  | Jul. 31, 2019 |  |  |  |  |
Revolving Credit Facility [Member] | JPM $1 Billion Credit Facility [Member] | JP Morgan Chase Bank, N.A. [Member] |  |  |  |  |  |  |  |  |  |
Financing [Line Items] |  |  |  |  |  |  |  |  |  |
Amounts outstanding |  |  |  |  |  | 0 |  | $ 0 |  | $ 0
Amount borrowed |  |  |  |  |  |  | $ 400,000 | $ 694,000 | $ 483,000 |
Number of days borrowed |  |  |  |  |  |  | 71 days | 16 days | 81 days |
Weighted-average interest rate |  |  |  |  |  |  | 3.48% | 5.09% | 3.66% |
Revolving Credit Facility [Member] | JPM $1 Billion Credit Facility [Member] | JP Morgan Chase Bank, N.A. [Member] | Seventy-One Days [Member] |  |  |  |  |  |  |  |  |  |
Financing [Line Items] |  |  |  |  |  |  |  |  |  |
Amount borrowed |  |  |  |  |  |  | $ 400,000 |  | $ 400,000 |
Number of days borrowed |  |  |  |  |  |  | 71 days |  | 71 days |
Revolving Credit Facility [Member] | JPM $1 Billion Credit Facility [Member] | JP Morgan Chase Bank, N.A. [Member] | Seventy-One Days [Member] | LIBOR [Member] |  |  |  |  |  |  |  |  |  |
Financing [Line Items] |  |  |  |  |  |  |  |  |  |
Weighted-average interest rate |  |  |  |  |  |  | 3.48% |  | 3.48% |
Revolving Credit Facility [Member] | JPM $1 Billion Credit Facility [Member] | JP Morgan Chase Bank, N.A. [Member] | Overnight Basis [Member] |  |  |  |  |  |  |  |  |  |
Financing [Line Items] |  |  |  |  |  |  |  |  |  |
Amount borrowed |  |  |  |  |  | 0 |  |  |  |
Revolving Credit Facility [Member] | JPM $500 Million Credit Facility [Member] | JP Morgan Chase Bank, N.A. [Member] |  |  |  |  |  |  |  |  |  |
Financing [Line Items] |  |  |  |  |  |  |  |  |  |
Amounts outstanding |  |  |  |  |  | 0 |  | $ 0 |  | 0
Amount borrowed |  |  |  |  |  | $ 273,000 | $ 400,000 | $ 450,000 | $ 400,000 |
Number of days borrowed |  |  |  |  |  | 3 days | 71 days | 27 days | 78 days |
Weighted-average interest rate |  |  |  |  |  | 4.75% | 3.48% | 3.30% | 3.57% |
Revolving Credit Facility [Member] | JPM $500 Million Credit Facility [Member] | JP Morgan Chase Bank, N.A. [Member] | Three Days [Member] |  |  |  |  |  |  |  |  |  |
Financing [Line Items] |  |  |  |  |  |  |  |  |  |
Amount borrowed |  |  |  |  |  | $ 64,000 |  | $ 64,000 |  |
Number of days borrowed |  |  |  |  |  | 3 days |  | 3 days |  |
Weighted-average interest rate |  |  |  |  |  | 4.75% |  | 4.75% |  |
Revolving Credit Facility [Member] | JPM $500 Million Credit Facility [Member] | JP Morgan Chase Bank, N.A. [Member] | Eight Days [Member] |  |  |  |  |  |  |  |  |  |
Financing [Line Items] |  |  |  |  |  |  |  |  |  |
Amount borrowed |  |  |  |  |  |  |  | $ 450,000 |  |
Number of days borrowed |  |  |  |  |  |  |  | 8 days |  |
Revolving Credit Facility [Member] | JPM $500 Million Credit Facility [Member] | JP Morgan Chase Bank, N.A. [Member] | Eight Days [Member] | LIBOR [Member] |  |  |  |  |  |  |  |  |  |
Financing [Line Items] |  |  |  |  |  |  |  |  |  |
Weighted-average interest rate |  |  |  |  |  |  |  | 3.00% |  |
Revolving Credit Facility [Member] | JPM $500 Million Credit Facility [Member] | JP Morgan Chase Bank, N.A. [Member] | Ten Days [Member] |  |  |  |  |  |  |  |  |  |
Financing [Line Items] |  |  |  |  |  |  |  |  |  |
Amount borrowed |  |  |  |  |  | $ 400,000 |  | $ 400,000 |  |
Number of days borrowed |  |  |  |  |  | 10 days |  | 10 days |  |
Revolving Credit Facility [Member] | JPM $500 Million Credit Facility [Member] | JP Morgan Chase Bank, N.A. [Member] | Ten Days [Member] | LIBOR [Member] |  |  |  |  |  |  |  |  |  |
Financing [Line Items] |  |  |  |  |  |  |  |  |  |
Weighted-average interest rate |  |  |  |  |  | 3.00% |  | 3.00% |  |
Revolving Credit Facility [Member] | JPM $500 Million Credit Facility [Member] | JP Morgan Chase Bank, N.A. [Member] | Seventy-One Days [Member] |  |  |  |  |  |  |  |  |  |
Financing [Line Items] |  |  |  |  |  |  |  |  |  |
Amount borrowed |  |  |  |  |  |  | $ 400,000 |  | $ 400,000 |
Number of days borrowed |  |  |  |  |  |  | 71 days |  | 71 days |
Revolving Credit Facility [Member] | JPM $500 Million Credit Facility [Member] | JP Morgan Chase Bank, N.A. [Member] | Seventy-One Days [Member] | LIBOR [Member] |  |  |  |  |  |  |  |  |  |
Financing [Line Items] |  |  |  |  |  |  |  |  |  |
Weighted-average interest rate |  |  |  |  |  |  | 3.48% |  | 3.48% |
Revolving Credit Facility [Member] | PNC $250 Million Credit Facility [Member] | PNC Bank, National Association [Member] |  |  |  |  |  |  |  |  |  |
Financing [Line Items] |  |  |  |  |  |  |  |  |  |
Amounts outstanding |  |  |  |  |  | $ 51,200 |  | $ 51,200 |  |
Maximum borrowing capacity |  | $ 250,000 |  |  |  |  |  |  |  |
Term |  | 3 years |  |  |  |  |  |  |  |
Amount borrowed |  |  |  |  |  | $ 141,300 |  | $ 141,300 |  |
Number of days borrowed |  |  |  |  |  | 91 days |  | 270 days |  |
Weighted-average interest rate |  |  |  |  |  | 2.55% |  | 2.79% |  |
Revolving Credit Facility [Member] | PNC $150 Million Credit Facility [Member] | PNC Bank, National Association [Member] |  |  |  |  |  |  |  |  |  |
Financing [Line Items] |  |  |  |  |  |  |  |  |  |
Amounts outstanding |  |  |  |  |  |  |  |  |  | 0
Maximum borrowing capacity |  |  |  | $ 150,000 |  |  |  |  |  |
Term |  |  |  | 4 years |  |  |  |  |  |
Expiration date |  |  |  | Feb. 06, 2020 |  |  |  |  |  |
Amount borrowed |  |  |  |  |  |  | $ 58,900 |  | $ 58,900 |
Number of days borrowed |  |  |  |  |  |  | 90 days |  | 269 days |
Weighted-average interest rate |  |  |  |  |  |  | 2.94% |  | 2.72% |
Standby Letters of Credit [Member] |  |  |  |  |  |  |  |  |  |
Financing [Line Items] |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  | $ 147,400 |  | $ 147,400 |  | 148,900
Amounts outstanding |  |  |  |  |  | $ 0 | $ 0 | $ 0 | $ 0 | $ 0
Minimum [Member] | Standby Letters of Credit [Member] |  |  |  |  |  |  |  |  |  |
Financing [Line Items] |  |  |  |  |  |  |  |  |  |
Expiration date |  |  |  |  |  |  |  | Apr. 01, 2020 |  |
Maximum [Member] | Standby Letters of Credit [Member] |  |  |  |  |  |  |  |  |  |
Financing [Line Items] |  |  |  |  |  |  |  |  |  |
Expiration date |  |  |  |  |  |  |  | Feb. 05, 2021 |  |
[1] | Borrower is a wholly owned subsidiary of the Company.
[2] | JPM acts as the administrative agent for this syndicated credit facility.

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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 + Details
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