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Funds Held for Clients and Corporate Investments (Details 1) (USD $) In Millions, unless otherwise specified | Feb. 28, 2015 | May 31, 2014
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Classification of investments on the Consolidated Balance Sheets |  |
Funds held for clients | $ 5,090.8 us-gaap_FundsHeldForClients | $ 4,198.6 us-gaap_FundsHeldForClients
Corporate investments | 355.5 us-gaap_MarketableSecuritiesCurrent | 398.7 us-gaap_MarketableSecuritiesCurrent
Long-term corporate investments | 408.6 us-gaap_AvailableForSaleSecuritiesNoncurrent | 385.6 us-gaap_AvailableForSaleSecuritiesNoncurrent
Total funds held for clients and corporate investments, Fair value | 5,854.9 payx_FundsHeldForClientsAndCorporateInvestmentsFairValue | 4,982.9 payx_FundsHeldForClientsAndCorporateInvestmentsFairValue
Securities in an unrealized loss position |  |
Less than twelve months, Gross unrealized losses | (0.9)payx_AvailableforsaleSecuritiesContinuousunrealizedlosspositionLessthantwelvemonthsAggregateLosses | (0.1)payx_AvailableforsaleSecuritiesContinuousunrealizedlosspositionLessthantwelvemonthsAggregateLosses
Less than twelve months, Fair value | 268.3 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue | 118.8 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
Twelve months or longer, Gross unrealized losses | (0.3)payx_AvailableforsaleSecuritiesContinuousUnrealizedLossPositionTwelvemonthsorlongerAggregatelosses | (2.9)payx_AvailableforsaleSecuritiesContinuousUnrealizedLossPositionTwelvemonthsorlongerAggregatelosses
Twelve months or longer, Fair value | 26.7 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue | 276.4 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
Total, Gross unrealized losses | (1.2)payx_AvailableforsaleSecuritiesContinuousunrealizedlosspostitionAggregatelosses | (3.0)payx_AvailableforsaleSecuritiesContinuousunrealizedlosspostitionAggregatelosses
Total, Fair value | 295.0 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue | 395.2 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
General obligation municipal bonds [Member] |  |
Securities in an unrealized loss position |  |
Less than twelve months, Gross unrealized losses | (0.5)payx_AvailableforsaleSecuritiesContinuousunrealizedlosspositionLessthantwelvemonthsAggregateLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = payx_GeneralObligationMunicipalBondsMember | (0.1)payx_AvailableforsaleSecuritiesContinuousunrealizedlosspositionLessthantwelvemonthsAggregateLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = payx_GeneralObligationMunicipalBondsMember
Less than twelve months, Fair value | 150.1 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = payx_GeneralObligationMunicipalBondsMember | 69.6 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = payx_GeneralObligationMunicipalBondsMember
Twelve months or longer, Gross unrealized losses | (0.3)payx_AvailableforsaleSecuritiesContinuousUnrealizedLossPositionTwelvemonthsorlongerAggregatelosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = payx_GeneralObligationMunicipalBondsMember | (1.8)payx_AvailableforsaleSecuritiesContinuousUnrealizedLossPositionTwelvemonthsorlongerAggregatelosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = payx_GeneralObligationMunicipalBondsMember
Twelve months or longer, Fair value | 26.7 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = payx_GeneralObligationMunicipalBondsMember | 164.0 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = payx_GeneralObligationMunicipalBondsMember
Total, Gross unrealized losses | (0.8)payx_AvailableforsaleSecuritiesContinuousunrealizedlosspostitionAggregatelosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = payx_GeneralObligationMunicipalBondsMember | (1.9)payx_AvailableforsaleSecuritiesContinuousunrealizedlosspostitionAggregatelosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = payx_GeneralObligationMunicipalBondsMember
Total, Fair value | 176.8 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = payx_GeneralObligationMunicipalBondsMember | 233.6 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = payx_GeneralObligationMunicipalBondsMember
Pre-refunded municipal bonds [Member] |  |
Securities in an unrealized loss position |  |
Less than twelve months, Gross unrealized losses |  | 0 payx_AvailableforsaleSecuritiesContinuousunrealizedlosspositionLessthantwelvemonthsAggregateLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = payx_PreRefundedMunicipalBondsMember
Less than twelve months, Fair value |  | 1.7 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = payx_PreRefundedMunicipalBondsMember
Twelve months or longer, Gross unrealized losses |  | 0 payx_AvailableforsaleSecuritiesContinuousUnrealizedLossPositionTwelvemonthsorlongerAggregatelosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = payx_PreRefundedMunicipalBondsMember
Twelve months or longer, Fair value |  | 0 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = payx_PreRefundedMunicipalBondsMember
Total, Gross unrealized losses |  | 0 payx_AvailableforsaleSecuritiesContinuousunrealizedlosspostitionAggregatelosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = payx_PreRefundedMunicipalBondsMember
Total, Fair value |  | 1.7 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = payx_PreRefundedMunicipalBondsMember
Revenue municipal bonds [Member] |  |
Securities in an unrealized loss position |  |
Less than twelve months, Gross unrealized losses | (0.4)payx_AvailableforsaleSecuritiesContinuousunrealizedlosspositionLessthantwelvemonthsAggregateLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = payx_RevenueMunicipalBondsMember | 0 payx_AvailableforsaleSecuritiesContinuousunrealizedlosspositionLessthantwelvemonthsAggregateLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = payx_RevenueMunicipalBondsMember
Less than twelve months, Fair value | 118.2 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = payx_RevenueMunicipalBondsMember | 47.5 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = payx_RevenueMunicipalBondsMember
Twelve months or longer, Gross unrealized losses | 0 payx_AvailableforsaleSecuritiesContinuousUnrealizedLossPositionTwelvemonthsorlongerAggregatelosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = payx_RevenueMunicipalBondsMember | (1.1)payx_AvailableforsaleSecuritiesContinuousUnrealizedLossPositionTwelvemonthsorlongerAggregatelosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = payx_RevenueMunicipalBondsMember
Twelve months or longer, Fair value | 0 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = payx_RevenueMunicipalBondsMember | 112.4 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = payx_RevenueMunicipalBondsMember
Total, Gross unrealized losses | (0.4)payx_AvailableforsaleSecuritiesContinuousunrealizedlosspostitionAggregatelosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = payx_RevenueMunicipalBondsMember | (1.1)payx_AvailableforsaleSecuritiesContinuousunrealizedlosspostitionAggregatelosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = payx_RevenueMunicipalBondsMember
Total, Fair value | $ 118.2 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = payx_RevenueMunicipalBondsMember | $ 159.9 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = payx_RevenueMunicipalBondsMember

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- Definition Investments in debt and equity securities which are categorized neither as held-to-maturity nor trading and which are intended to be sold or mature more than one year from the balance sheet date or operating cycle, if longer. Such securities are reported at fair value; unrealized gains (losses) related to Available-for-sale Securities are excluded from earnings and reported in a separate component of shareholders' equity (other comprehensive income), unless the Available-for-sale security is designated as a hedge or is determined to have had an other than temporary decline in fair value below its amortized cost basis. All or a portion of the unrealized holding gain (loss) of an Available-for-sale security that is designated as being hedged in a fair value hedge is recognized in earnings during the period of the hedge, as are other than temporary declines in fair value below the cost basis for investments in equity securities and debt securities that an entity intends to sell or it is more likely than not that it will be required to sell before the recovery of its amortized cost basis. Other than temporary declines in fair value below the cost basis for debt securities categorized as Available-for-sale that an entity does not intend to sell and for which it is not more likely than not that the entity will be required to sell before the recovery of its amortized cost basis are bifurcated into credit losses and losses related to all other factors. Other than temporary declines in fair value below cost basis related to credit losses are recognized in earnings, and losses related to all other factors are recognized in other comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Available-for-Sale Securities -URI http://asc.fasb.org/extlink&oid=6505594 + Details
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