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Funds Held for Clients and Corporate Investments (Details 2) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Feb. 28, 2015 Security | Feb. 28, 2014 | Feb. 28, 2015 Security | Feb. 28, 2014 | May 31, 2014 Security
Maturity Date: |  |  |  |  |
Due in one year or less, Amortized cost | $ 367.0 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsAmortizedCostBasis |  | $ 367.0 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsAmortizedCostBasis |  |
Due in one year or less, Fair value | 369.2 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsFairValue |  | 369.2 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsFairValue |  |
Due after one year through three years, Amortized cost | 736.0 payx_AvailableForSaleSecuritiesDebtMaturitiesRollingYearOneThroughThreeAmortizedCostBasis |  | 736.0 payx_AvailableForSaleSecuritiesDebtMaturitiesRollingYearOneThroughThreeAmortizedCostBasis |  |
Due after one year through three years, Fair value | 747.6 payx_AvailableForSaleSecuritiesDebtMaturitiesRollingYearOneThroughThreeFairValue |  | 747.6 payx_AvailableForSaleSecuritiesDebtMaturitiesRollingYearOneThroughThreeFairValue |  |
Due after three years through five years, Amortized cost | 766.7 payx_AvailableForSaleSecuritiesDebtMaturitiesRollingYearFourThroughFiveAmortizedCostBasis |  | 766.7 payx_AvailableForSaleSecuritiesDebtMaturitiesRollingYearFourThroughFiveAmortizedCostBasis |  |
Due after three years through five years, Fair value | 775.0 payx_AvailableForSaleSecuritiesDebtMaturitiesRollingYearFourThroughFiveFairValue |  | 775.0 payx_AvailableForSaleSecuritiesDebtMaturitiesRollingYearFourThroughFiveFairValue |  |
Due after five years, Amortized cost | 1,277.8 payx_AvailableForSaleSecuritiesDebtMaturitiesRollingAfterFiveYearsAmortizedCost |  | 1,277.8 payx_AvailableForSaleSecuritiesDebtMaturitiesRollingAfterFiveYearsAmortizedCost |  |
Due after five years, Fair value | 1,291.3 payx_AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearFiveFairValue |  | 1,291.3 payx_AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearFiveFairValue |  |
Total, Amortized cost | 3,147.5 us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis |  | 3,147.5 us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis |  |
Fair value | 3,183.1 us-gaap_AvailableForSaleSecurities |  | 3,183.1 us-gaap_AvailableForSaleSecurities |  | 3,391.4 us-gaap_AvailableForSaleSecurities
Funds Held for Clients and Corporate Investments (Textual) |  |  |  |  |
Net unrealized gain on available-for-sale securities | 35.6 payx_Netunrealizedgainlossonavailableforsalesecurities |  | 35.6 payx_Netunrealizedgainlossonavailableforsalesecurities |  | 34.5 payx_Netunrealizedgainlossonavailableforsalesecurities
Number of available-for-sale securities in an unrealized loss position | 81 us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1 |  | 81 us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1 |  | 98 us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1
Gross realized gains | 0 us-gaap_AvailableForSaleSecuritiesGrossRealizedGains | 0.3 us-gaap_AvailableForSaleSecuritiesGrossRealizedGains | 0.2 us-gaap_AvailableForSaleSecuritiesGrossRealizedGains | 0.5 us-gaap_AvailableForSaleSecuritiesGrossRealizedGains |
Gross realized losses | $ 0 us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses | $ 0 us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses | $ 0 us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses | $ 0 us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses |
Minimum maturity period for VRDNs primarily categorized as due after five years (in years) |  |  | 20 years |  |
Maximum maturity period for VRDNs, primarily categorized as due after five years (in years) |  |  | 30 years |  |

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- Definition Available For Sale Securities Debt Maturities Rolling After Five Years Amortized Cost. + References No definition available. + Details
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- Definition Amount of available-for-sale debt securities at fair value maturing after the fifth rolling twelve months following the latest balance sheet presented. + References No definition available. + Details
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- Definition Amount of available-for-sale debt securities at cost maturing in the fourth rolling twelve months through the fifth rolling twelve months following the latest balance sheet presented + References No definition available. + Details
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- Definition Amount of available-for-sale debt securities at fair value maturing in the fourth rolling twelve months through the fifth rolling twelve months following the latest balance sheet presented. + References No definition available. + Details
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- Definition Amount of available-for-sale debt securities at cost maturing in the second rolling twelve months through the third rolling twelve months following the balance sheet date presented. + References No definition available. + Details
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- Definition Amount of available-for-sale debt securities at fair value maturing in the second rolling twelve months through the third rolling twelve months following the balance sheet date presented. + References No definition available. + Details
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- Definition Maximum Maturity Period For Variable Rate Demand Note Primarily Categorized As Due After Five Years (in years) + References No definition available. + Details
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- Definition Minimum maturity period for VRDNs primarily categorized as due after five years (in years) + References No definition available. + Details
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- Definition The net amount of gross unrealized gains (losses) for securities, at a point in time, which are categorized as neither held-to-maturity nor trading securities. + References No definition available. + Details
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- Definition This item represents the cost of debt 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + 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 Amount after adjustments of available-for-sale debt securities at cost, maturing in the next rolling twelve months following the latest balance sheet. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments and fair value hedge accounting adjustments. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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- Definition Fair value of available-for-sale debt securities maturing in the next rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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- Definition This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 + Details
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- Definition This item represents the gross loss realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 + Details
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- Definition Number of investment positions in available-for-sale investments in a continuous unrealized loss position for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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