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Long-Term Financing (Narrative) (Details) - USD ($) $ in Millions | Feb. 29, 2020 | May 31, 2019 | Mar. 13, 2019
--- | --- | --- | ---
Aggregate principal amount | $ 800.0 | $ 800.0 |
Senior Notes [Member] |  |  |
Aggregate principal amount | 800.0 | 800.0 |
Senior Notes [Member] | Company And Paychex Of New York [Member] |  |  |
Aggregate principal amount |  |  | $ 800.0
Senior Notes, Series A [Member] | Senior Notes [Member] |  |  |
Aggregate principal amount | $ 400.0 | 400.0 |
Principal payment dates | Mar. 13, 2026 |  |
Senior Notes, Series A [Member] | Senior Notes [Member] | Company And Paychex Of New York [Member] |  |  |
Aggregate principal amount |  |  | $ 400.0
Principal payment dates |  |  | Mar. 13, 2026
Senior Notes, Series B [Member] | Senior Notes [Member] |  |  |
Aggregate principal amount | $ 400.0 | $ 400.0 |
Principal payment dates | Mar. 13, 2029 |  |
Senior Notes, Series B [Member] | Senior Notes [Member] | Company And Paychex Of New York [Member] |  |  |
Aggregate principal amount |  |  | $ 400.0
Principal payment dates |  |  | Mar. 13, 2029

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