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SUBSEQUENT EVENTS (Narrative) (Details) (S2S Global, Subsequent Event, USD $)
In Millions, unless otherwise specified
0 Months Ended
Feb. 02, 2015
S2S Global | Subsequent Event
 
Subsequent Event [Line Items]  
Remaining ownership interest acquired, percentage 40.00%pinc_ConsolidationLessthanWhollyOwnedSubsidiaryParentOwnershipInterestChangesPurchaseofInterestbyParentPercentage
/ us-gaap_BusinessAcquisitionAxis
= pinc_S2SGlobalMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Stock repurchased and retired during period, value $ 14.5us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesPurchaseOfInterestByParent
/ us-gaap_BusinessAcquisitionAxis
= pinc_S2SGlobalMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember