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LONG-TERM BORROWINGS (Details) (USD $) | 1 Months Ended | 3 Months Ended | 1 Months Ended |
--- | --- | --- | --- | ---
Aug. 31, 2014 | Feb. 01, 2015 | Jan. 31, 2015 | Aug. 25, 2013 | Apr. 30, 2011 | Nov. 02, 2014
Long-term borrowings [Abstract] |  |  |  |  |  |
Long-term debt and capital lease obligations |  | $ 139,819,000 us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities |  |  |  | $ 142,186,000 us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities
Less current portion |  | 10,457,000 us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent |  |  |  | 10,381,000 us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent
Long-term debt and capital lease obligations non current |  | 129,362,000 us-gaap_LongTermDebtAndCapitalLeaseObligations |  |  |  | 131,805,000 us-gaap_LongTermDebtAndCapitalLeaseObligations
Credit Facility [Member] |  |  |  |  |  |
Long-term borrowings [Abstract] |  |  |  |  |  |
Maturity date of debt | Dec. 31, 2018 | Dec. 31, 2018 |  |  |  |
Available borrowing capacity | 50,000,000 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember | 50,000,000 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember |  |  |  |
Maximum borrowing capacity | 75,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember | 75,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember |  |  |  |
Amount outstanding under credit facility |  | 0 us-gaap_LineOfCredit / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember |  |  |  |
Current borrowing capacity |  | 50,000,000 us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember |  |  |  |
Variable interest rate (in hundredths) |  | 1.69%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember |  |  |  |
3.25% convertible senior notes due on April 1, 2016 [Member] |  |  |  |  |  |
Long-term borrowings [Abstract] |  |  |  |  |  |
Long-term debt and capital lease obligations |  | 57,500,000 us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities / us-gaap_LongtermDebtTypeAxis = plab_ConvertibleSeniorNotesDueOnApril2016Member |  |  |  | 115,000,000 us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities / us-gaap_LongtermDebtTypeAxis = plab_ConvertibleSeniorNotesDueOnApril2016Member
Interest rate percentage (in hundredths) |  | 3.25%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = plab_ConvertibleSeniorNotesDueOnApril2016Member |  |  |  |
Maturity date of debt |  | Apr. 01, 2016 |  |  |  |
3.25 convertible senior notes due on April 2019 [Member] |  |  |  |  |  |
Long-term borrowings [Abstract] |  |  |  |  |  |
Long-term debt and capital lease obligations |  | 57,500,000 us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities / us-gaap_LongtermDebtTypeAxis = plab_ConvertibleSeniorNotesDueOnApril2019Member |  |  |  | 0 us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities / us-gaap_LongtermDebtTypeAxis = plab_ConvertibleSeniorNotesDueOnApril2019Member
Interest rate percentage (in hundredths) |  | 3.25%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = plab_ConvertibleSeniorNotesDueOnApril2019Member |  |  |  |
Maturity date of debt |  | Apr. 01, 2019 |  |  |  |
Number of shares each note is convertible to (in shares) |  |  | 96 us-gaap_DebtInstrumentConvertibleNumberOfEquityInstruments / us-gaap_LongtermDebtTypeAxis = plab_ConvertibleSeniorNotesDueOnApril2019Member |  |  |
Face amount of each note converted |  |  | 1,000 plab_FaceAmountOfEachNoteConvertedOrConvertible / us-gaap_LongtermDebtTypeAxis = plab_ConvertibleSeniorNotesDueOnApril2019Member |  |  |
Conversion price per share (in dollars per share) |  |  | $ 10.37 us-gaap_DebtInstrumentConvertibleConversionPrice1 / us-gaap_LongtermDebtTypeAxis = plab_ConvertibleSeniorNotesDueOnApril2019Member |  |  |
2.77% capital lease obligation payable through July 2018 [Member] |  |  |  |  |  |
Long-term borrowings [Abstract] |  |  |  |  |  |
Long-term debt and capital lease obligations |  | 19,211,000 us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities / us-gaap_LongtermDebtTypeAxis = plab_CapitalLeaseObligationPayableThrough2018Member |  |  |  | 20,481,000 us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities / us-gaap_LongtermDebtTypeAxis = plab_CapitalLeaseObligationPayableThrough2018Member
Interest rate percentage (in hundredths) |  | 2.77%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = plab_CapitalLeaseObligationPayableThrough2018Member |  |  |  |
Maturity date of debt |  | Jul. 31, 2018 |  |  |  |
Original face amount of debt |  |  |  | 26,400,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = plab_CapitalLeaseObligationPayableThrough2018Member |  |
Repayment period of debt |  |  |  | 5 years |  |
Periodic payments |  |  |  | 500,000 us-gaap_DebtInstrumentPeriodicPaymentPrincipal / us-gaap_LongtermDebtTypeAxis = plab_CapitalLeaseObligationPayableThrough2018Member |  |
Frequency of periodic payment |  |  |  | per month |  |
Amount payable through the end of lease term |  | 20,200,000 us-gaap_CapitalLeasesFutureMinimumPaymentsNetMinimumPayments1 / us-gaap_LongtermDebtTypeAxis = plab_CapitalLeaseObligationPayableThrough2018Member |  |  |  |
Interest included in lease payments |  | 1,000,000 us-gaap_CapitalLeasesFutureMinimumPaymentsInterestIncludedInPayments / us-gaap_LongtermDebtTypeAxis = plab_CapitalLeaseObligationPayableThrough2018Member |  |  |  |
3.09% capital lease obligation payable through March 2016 [Member] |  |  |  |  |  |
Long-term borrowings [Abstract] |  |  |  |  |  |
Long-term debt and capital lease obligations |  | 5,608,000 us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities / us-gaap_LongtermDebtTypeAxis = us-gaap_CapitalLeaseObligationsMember |  |  |  | 6,705,000 us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities / us-gaap_LongtermDebtTypeAxis = us-gaap_CapitalLeaseObligationsMember
Interest rate percentage (in hundredths) |  | 3.09%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = us-gaap_CapitalLeaseObligationsMember |  |  |  |
Maturity date of debt |  | Mar. 30, 2016 |  |  |  |
Original face amount of debt |  |  |  |  | 21,200,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = us-gaap_CapitalLeaseObligationsMember |
Repayment period of debt |  |  |  |  | 5 years |
Periodic payments |  |  |  |  | 400,000 us-gaap_DebtInstrumentPeriodicPaymentPrincipal / us-gaap_LongtermDebtTypeAxis = us-gaap_CapitalLeaseObligationsMember |
Frequency of periodic payment |  |  |  |  | per month |
Amount payable through the end of lease term |  | 5,700,000 us-gaap_CapitalLeasesFutureMinimumPaymentsNetMinimumPayments1 / us-gaap_LongtermDebtTypeAxis = us-gaap_CapitalLeaseObligationsMember |  |  |  |
Interest included in lease payments |  | $ 100,000 us-gaap_CapitalLeasesFutureMinimumPaymentsInterestIncludedInPayments / us-gaap_LongtermDebtTypeAxis = us-gaap_CapitalLeaseObligationsMember |  |  |  |

X
- Definition This line item represents the face amount of each note converted or convertible to common stock. + References No definition available. + Details
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- Definition Amount necessary to reduce net minimum lease payments to present value for capital leases. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737 + Details
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- Definition Amount of minimum lease payments for capital leases net of executory costs, which include amounts paid by the lessee to the lessor for insurance, maintenance and taxes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737 + Details
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- Definition The price per share of the conversion feature embedded in the debt instrument. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6031898-161870 + Details
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- Definition The number of equity instruments that the holder of the debt instrument would receive if the debt was converted to equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21521-112644 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(5)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Description of the frequency of periodic payments (monthly, quarterly, annual). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 + Details
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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of the required periodic payments applied to principal. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 + Details
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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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