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v2.4.1.9

Long Term Debt (Narrative) (Details) (USD $) | 6 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2015 | Dec. 31, 2014 | Feb. 28, 2015 | Oct. 31, 2001
Line Of Credit Facility [Line Items] |  |  |  |
Balance in the restricted sinking fund | $ 200,000 us-gaap_DebtInstrumentCumulativeSinkingFundPayments |  |  |
U.S. Revolver |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Revolving credit facility |  | 75,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_DomesticLineOfCreditMember |  |
Revolving credit interest rate | The interest rate for amounts outstanding under the Amended Credit Agreement for the U.S. Revolver is a floating rate based upon the higher of the Federal Funds Rate plus 0.5%, the bank’s prime rate, or the Eurocurrency rate plus 1.00%. |  |  |
Outstanding letters of credit | 18,000,000 us-gaap_LineOfCredit / us-gaap_CreditFacilityAxis = us-gaap_DomesticLineOfCreditMember |  |  |
Amount of credit facility remaining borrowing capacity | 57,000,000 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_DomesticLineOfCreditMember |  |  |
Credit facility expiration date | Dec. 31, 2018 |  |  |
Revolving credit facility, current borrowing capacity | 0 us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_DomesticLineOfCreditMember |  |  |
Percentage of voting capital stock pledged as collateral | 100.00%powl_PercentageOfDomesticCapitalStockPledgedAsCollateralForCreditFacility / us-gaap_CreditFacilityAxis = us-gaap_DomesticLineOfCreditMember |  |  |
Non-domestic subsidiaries of voting capital stock | 65.00%powl_PercentageOfNonDomesticCapitalStockPledgedAsCollateralForCreditFacility / us-gaap_CreditFacilityAxis = us-gaap_DomesticLineOfCreditMember |  |  |
U.S. Revolver | Maximum |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Basis spread on variable rate | 1.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = us-gaap_DomesticLineOfCreditMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |
U.S. Revolver | Federal Funds Rate |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Basis spread on variable rate | 0.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = us-gaap_DomesticLineOfCreditMember / us-gaap_VariableRateAxis = us-gaap_FederalFundsEffectiveSwapRateMember |  |  |
U.S. Revolver | Eurocurrency Rate |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Basis spread on variable rate | 1.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = us-gaap_DomesticLineOfCreditMember / us-gaap_VariableRateAxis = us-gaap_EurodollarMember |  |  |
Canadian Revolver |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Revolving credit facility |  |  | 7,900,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_ForeignLineOfCreditMember |
Credit facility expiration date | Feb. 28, 2015 |  |  |
Canadian Revolver | Maximum |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Basis spread on variable rate | 1.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = us-gaap_ForeignLineOfCreditMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |
Canadian Revolver | Minimum |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Basis spread on variable rate | 0.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = us-gaap_ForeignLineOfCreditMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |
Industrial Development Revenue Bonds |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Borrowings |  |  |  | 8,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_CreditFacilityAxis = powl_IndustrialDevelopmentRevenueBondsMember
Reimbursement agreement requires annual redemptions | $ 400,000 us-gaap_DebtInstrumentAnnualPrincipalPayment / us-gaap_CreditFacilityAxis = powl_IndustrialDevelopmentRevenueBondsMember |  |  |
Interest rate | 0.16%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_CreditFacilityAxis = powl_IndustrialDevelopmentRevenueBondsMember |  |  |

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- Definition Percentage of domestic capital stock pledged as collateral for credit facility. + References No definition available. + Details
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- Definition Percentage of non domestic capital stock pledged as collateral for credit facility. + References No definition available. + Details
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- Definition Amount of the total principal payments made during the annual reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -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 Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition Cumulative amount paid into a fund, which is used to retire the debt instrument. + 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 + Details
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- Definition The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + 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 FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400 + 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 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 Date the credit facility terminates, in CCYY-MM-DD format. + 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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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + 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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