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Intangible Assets (Narrative) (Details) (USD $) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2015 | Dec. 31, 2014 | Mar. 31, 2014 | Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2013
Finite Lived Intangible Assets [Line Items] |  |  |  |  |  |
Amortization of intangible assets | $ 113,000 us-gaap_AmortizationOfIntangibleAssets |  | $ 121,000 us-gaap_AmortizationOfIntangibleAssets | $ 232,000 us-gaap_AmortizationOfIntangibleAssets | $ 536,000 us-gaap_AmortizationOfIntangibleAssets |
Cash received from amended supply agreement |  | 10,000,000 powl_CashReceivedFromAmendedSupplyAgreement |  | 2,333,000 powl_CashReceivedFromAmendedSupplyAgreement | 10,000,000 powl_CashReceivedFromAmendedSupplyAgreement |
Deferred credit amortization period |  |  |  | 4 years |  |
General Electric Company |  |  |  |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |  |  |  |
Additional amount paid on execution of agreement |  |  |  | 7,000,000 powl_AdditionalAmountPaidOnExecutionOfAgreement / dei_LegalEntityAxis = powl_GeneralElectricCompanyMember |  |
Acquired finite-lived intangible assets, period |  |  |  | 3 years |  |
Deferred credit |  |  |  |  |  | $ 8,100,000 us-gaap_DeferredRevenueAndCredits / dei_LegalEntityAxis = powl_GeneralElectricCompanyMember
Supply Agreement |  |  |  |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |  |  |  |
Useful life of intangible asset |  |  |  | 15 years |  |

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- Definition Additional amount paid on execution of agreement. + References No definition available. + Details
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- Definition Cash received from amended supply agreement. + References No definition available. + Details
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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275 + Details
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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Total carrying amount of consideration received or receivable as of the balance sheet date representing potential earnings that were not as yet recognized as revenue or other forms of income in conformity with GAAP. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 13 -Section A Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 13.A.4(a).Q1 Response) -URI http://asc.fasb.org/extlink&oid=27012821&loc=d3e214044-122780 + Details
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- Definition Remaining amortization period of finite-lived intangible assets, 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 Useful life of finite-lived intangible assets, 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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