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SIGNIFICANT ACCOUNTING POLICIES - Redeemable Limited Partner's Capital (Narrative) (Details)	12 Months Ended
	Jun. 30, 2018
Common Class B Unit
Redeemable Noncontrolling Interest [Line Items]
Common stock conversion ratio	1
Limited Partner
Redeemable Noncontrolling Interest [Line Items]
Period of payment of partnership interest upon withdrawal from partnership	5 years

X

- Definition

Period of Payment of Partnership Interest Upon Withdrawal from Partnership

+ References

No definition available.

+ Details

Name:	pinc_PeriodofPaymentofPartnershipInterestUponWithdrawalfromPartnership
Namespace Prefix:	pinc_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Unit of Partnership, Conversion Ratio

+ References

No definition available.

+ Details

Name:	pinc_UnitofPartnershipConversionRatio
Namespace Prefix:	pinc_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_RedeemableNoncontrollingInterestLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_LimitedPartnersCapitalAccountByClassAxis=pinc_CommonClassBUnitMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PartnerTypeOfPartnersCapitalAccountAxis=us-gaap_LimitedPartnerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: