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ACQUISITION OF DNP PHOTOMASK TECHNOLOGY TAIWAN CO., LTD. (Details) (USD $) In Millions, unless otherwise specified | 0 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Apr. 04, 2014 | May 03, 2015 | May 04, 2014 | May 04, 2014
Business Acquisition [Line Items] |  |  |  |
Date of acquisition |  | Apr. 04, 2014 |  |
Consideration transferred | $ 98.3 us-gaap_BusinessCombinationConsiderationTransferred1 |  |  |
Ownership percentage in PDMC (in hundredths) |  | 50.01%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired |  |
Acquisition costs related to the merger included in selling, general and administrative expense |  |  | $ 2.0 us-gaap_BusinessCombinationAcquisitionRelatedCosts | $ 2.5 us-gaap_BusinessCombinationAcquisitionRelatedCosts
DNP [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Ownership percentage of noncontrolling interests (in hundredths) |  | 49.99%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners / dei_LegalEntityAxis = us-gaap_CoVenturerMember |  |
PSMC [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Number of shares transferred to noncontrolling interests (in shares) |  | 112.9 us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued / dei_LegalEntityAxis = plab_PhotronicsSemiconductorMaskCorporationMember |  |
Customer Relationships [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Estimated amortization period |  | 12 years |  |

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