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COMMITMENTS AND CONTINGENT LIABILITIES (Narrative) (Details) - SweetIM [Member] - USD ($) $ in Thousands	Jun. 30, 2015	May 28, 2014	Nov. 30, 2012
Business Acquisition [Line Items]
Maximum subsequent consideration due for acquisition			$ 7,500
Estimated contingent payment		$ 2,500
Percentage of shares acquired			100.00%
Liability to be maintained	$ 5,000

X

- Definition

The estimated amount of consideration the company believes it will be required to pay for achievement of milestones per the SPA.

+ References

No definition available.

+ Details

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Namespace Prefix:	peri_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Represents the amount of liability to be maintained in the financial statement.

+ References

No definition available.

+ Details

Name:	peri_BusinessAcquisitionMinimumLiabilityMaintained
Namespace Prefix:	peri_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The maximum amount of subsequent consideration due at a future date for the acquisition. Consideration may include, but is not limited to, cash or stock.

+ References

No definition available.

+ Details

Name:	peri_BusinessAcquisitionSubsequentConsiderationMaximum
Namespace Prefix:	peri_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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_BusinessAcquisitionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Percentage of voting equity interests acquired at the acquisition date in the business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=65885119&loc=d3e1392-128463

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=peri_SweetIMLtdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: