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Funds Held for Clients and Corporate Investments (Details) (USD $) In Millions, unless otherwise specified | Feb. 28, 2015 | May 31, 2014
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Type of issue: |  |  |  |
Funds held for clients money market securities and other cash equivalents, Amortized cost | $ 2,657.9 payx_FundsHeldForClientsMoneyMarketSecuritiesAndOtherCashEquivalentsAmortizedCost |  | $ 1,579.2 payx_FundsHeldForClientsMoneyMarketSecuritiesAndOtherCashEquivalentsAmortizedCost |
Funds held for clients money market securities and other cash equivalents, Gross unrealized gains | 0 payx_FundsHeldForClientsMoneyMarketSecuritiesAndOtherCashEquivalentsGrossUnrealizedGains |  | 0 payx_FundsHeldForClientsMoneyMarketSecuritiesAndOtherCashEquivalentsGrossUnrealizedGains |
Funds held for clients money market securities and other cash equivalents, Gross unrealized losses | 0 payx_FundsHeldForClientsMoneyMarketSecuritiesAndOtherCashEquivalentsGrossUnrealizedLosses |  | 0 payx_FundsHeldForClientsMoneyMarketSecuritiesAndOtherCashEquivalentsGrossUnrealizedLosses |
Funds held for clients money market securities and other cash equivalents, Fair value | 2,657.9 payx_FundsHeldForClientsMoneyMarketSecuritiesAndOtherCashEquivalentsFairValue |  | 1,579.2 payx_FundsHeldForClientsMoneyMarketSecuritiesAndOtherCashEquivalentsFairValue |
Available-for-sale securities: |  |  |  |
Amortized cost | 3,147.5 us-gaap_AvailableForSaleSecuritiesAmortizedCost |  | 3,356.9 us-gaap_AvailableForSaleSecuritiesAmortizedCost |
Gross unrealized gains | 36.8 payx_AvailableForSaleSecuritiesGrossUnrealizedGains1 |  | 37.5 payx_AvailableForSaleSecuritiesGrossUnrealizedGains1 |
Gross unreailzed losses | (1.2)payx_AvailableForSaleSecuritiesGrossUnrealizedLosses |  | (3.0)payx_AvailableForSaleSecuritiesGrossUnrealizedLosses |
Fair value | 3,183.1 us-gaap_AvailableForSaleSecurities |  | 3,391.4 us-gaap_AvailableForSaleSecurities |
Other, Amortized cost | 12.4 payx_OtherSecuritiesAmortizedCost |  | 10.6 payx_OtherSecuritiesAmortizedCost |
Other, Gross unrealized gains | 1.5 payx_OtherSecuritiesGrossUnrealizedGains |  | 1.7 payx_OtherSecuritiesGrossUnrealizedGains |
Other, Gross unrealized losses | 0 payx_OtherSecuritiesGrossUnrealizedLosses |  | 0 payx_OtherSecuritiesGrossUnrealizedLosses |
Other, Fair value | 13.9 payx_OtherSecuritiesFairValue |  | 12.3 payx_OtherSecuritiesFairValue |
Total funds held for clients and corporate investments, Amortized cost | 5,817.8 payx_FundsHeldForClientsAndCorporateInvestmentsAmortizedCost |  | 4,946.7 payx_FundsHeldForClientsAndCorporateInvestmentsAmortizedCost |
Total funds held for clients and corporate investments, Gross unrealized gains | 38.3 payx_FundsHeldForClientsAndCorporateInvestmentsGrossUnrealizedGains |  | 39.2 payx_FundsHeldForClientsAndCorporateInvestmentsGrossUnrealizedGains |
Total funds held for clients and corporate investments, Gross unrealized losses | (1.2)payx_FundsHeldForClientsAndCorporateInvestmentsGrossUnrealizedLosses |  | (3.0)payx_FundsHeldForClientsAndCorporateInvestmentsGrossUnrealizedLosses |
Total funds held for clients and corporate investments, Fair value | 5,854.9 payx_FundsHeldForClientsAndCorporateInvestmentsFairValue |  | 4,982.9 payx_FundsHeldForClientsAndCorporateInvestmentsFairValue |
General obligation municipal bonds [Member] |  |  |  |
Available-for-sale securities: |  |  |  |
Amortized cost | 1,689.5 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = payx_GeneralObligationMunicipalBondsMember |  | 1,605.4 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = payx_GeneralObligationMunicipalBondsMember |
Gross unrealized gains | 23.6 payx_AvailableForSaleSecuritiesGrossUnrealizedGains1 / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = payx_GeneralObligationMunicipalBondsMember |  | 25.0 payx_AvailableForSaleSecuritiesGrossUnrealizedGains1 / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = payx_GeneralObligationMunicipalBondsMember |
Gross unreailzed losses | (0.8)payx_AvailableForSaleSecuritiesGrossUnrealizedLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = payx_GeneralObligationMunicipalBondsMember |  | (1.9)payx_AvailableForSaleSecuritiesGrossUnrealizedLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = payx_GeneralObligationMunicipalBondsMember |
Fair value | 1,712.3 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = payx_GeneralObligationMunicipalBondsMember |  | 1,628.5 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = payx_GeneralObligationMunicipalBondsMember |
Pre-refunded municipal bonds [Member] |  |  |  |
Available-for-sale securities: |  |  |  |
Amortized cost | 103.5 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = payx_PreRefundedMunicipalBondsMember | [1] | 140.4 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = payx_PreRefundedMunicipalBondsMember | [1]
Gross unrealized gains | 1.7 payx_AvailableForSaleSecuritiesGrossUnrealizedGains1 / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = payx_PreRefundedMunicipalBondsMember | [1] | 2.4 payx_AvailableForSaleSecuritiesGrossUnrealizedGains1 / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = payx_PreRefundedMunicipalBondsMember | [1]
Gross unreailzed losses | 0 payx_AvailableForSaleSecuritiesGrossUnrealizedLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = payx_PreRefundedMunicipalBondsMember | [1] | 0 payx_AvailableForSaleSecuritiesGrossUnrealizedLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = payx_PreRefundedMunicipalBondsMember | [1]
Fair value | 105.2 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = payx_PreRefundedMunicipalBondsMember | [1] | 142.8 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = payx_PreRefundedMunicipalBondsMember | [1]
Revenue municipal bonds [Member] |  |  |  |
Available-for-sale securities: |  |  |  |
Amortized cost | 969.6 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = payx_RevenueMunicipalBondsMember |  | 858.8 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = payx_RevenueMunicipalBondsMember |
Gross unrealized gains | 11.5 payx_AvailableForSaleSecuritiesGrossUnrealizedGains1 / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = payx_RevenueMunicipalBondsMember |  | 10.1 payx_AvailableForSaleSecuritiesGrossUnrealizedGains1 / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = payx_RevenueMunicipalBondsMember |
Gross unreailzed losses | (0.4)payx_AvailableForSaleSecuritiesGrossUnrealizedLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = payx_RevenueMunicipalBondsMember |  | (1.1)payx_AvailableForSaleSecuritiesGrossUnrealizedLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = payx_RevenueMunicipalBondsMember |
Fair value | 980.7 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = payx_RevenueMunicipalBondsMember |  | 867.8 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = payx_RevenueMunicipalBondsMember |
Variable rate demand notes [Member] |  |  |  |
Available-for-sale securities: |  |  |  |
Amortized cost | 384.9 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_VariableRateDemandObligationMember |  | 752.3 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_VariableRateDemandObligationMember |
Gross unrealized gains | 0 payx_AvailableForSaleSecuritiesGrossUnrealizedGains1 / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_VariableRateDemandObligationMember |  | 0 payx_AvailableForSaleSecuritiesGrossUnrealizedGains1 / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_VariableRateDemandObligationMember |
Gross unreailzed losses | 0 payx_AvailableForSaleSecuritiesGrossUnrealizedLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_VariableRateDemandObligationMember |  | 0 payx_AvailableForSaleSecuritiesGrossUnrealizedLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_VariableRateDemandObligationMember |
Fair value | $ 384.9 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_VariableRateDemandObligationMember |  | $ 752.3 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_VariableRateDemandObligationMember |
[1] | Pre-refunded municipal bonds are secured by an escrow fund of U.S. government obligations.

X
- Definition This item represents the gross unrealized gains for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities. + References No definition available. + Details
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- Definition This item represents the gross unrealized losses for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities. + References No definition available. + Details
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- Definition Funds held for clients and corporate investments amortized cost. + References No definition available. + Details
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- Definition Funds held for clients and corporate investments, fair value. + References No definition available. + Details
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- Definition Funds held for clients and corporate investments gross unrealized gains. + References No definition available. + Details
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- Definition Funds held for clients and corporate investments, Gross unrealized losses. + References No definition available. + Details
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- Definition Funds held for clients money market securities and other cash equivalents, amortized cost. + References No definition available. + Details
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- Definition Funds held for clients money market securities and other cash equivalents, fair value. + References No definition available. + Details
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- Definition Funds held for clients money market securities and other cash equivalents gross unrealized gains. + References No definition available. + Details
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- Definition Funds held for clients money market securities and other cash equivalents gross unrealized losses. + References No definition available. + Details
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- Definition Other securities amortized cost. + References No definition available. + Details
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- Definition Other securities fair value. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Other securities gross unrealized gains. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Other securities gross unrealized losses. + References No definition available. + Details
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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 + Details
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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + 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 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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