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Fair Value Measurements (Fair Value of Assets Measured on Recurring Basis) (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Sep. 30, 2014
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Assets: |  |
Cash equivalents | $ 234 us-gaap_CashAndCashEquivalentsFairValueDisclosure | $ 10,535 us-gaap_CashAndCashEquivalentsFairValueDisclosure
Deferred compensation | 5,135 powl_DeferredCompensationPlanAssetsFairValueDisclosure | 3,526 powl_DeferredCompensationPlanAssetsFairValueDisclosure
Liabilities: |  |
Deferred compensation | 4,947 us-gaap_DeferredCompensationLiabilityCurrentAndNoncurrent | 3,688 us-gaap_DeferredCompensationLiabilityCurrentAndNoncurrent
Fair Value, Inputs, Level 1 |  |
Assets: |  |
Cash equivalents | 234 us-gaap_CashAndCashEquivalentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 10,535 us-gaap_CashAndCashEquivalentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Deferred compensation | 2,001 powl_DeferredCompensationPlanAssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 724 powl_DeferredCompensationPlanAssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Fair Value, Inputs, Level 2 |  |
Assets: |  |
Deferred compensation | 3,134 powl_DeferredCompensationPlanAssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 2,802 powl_DeferredCompensationPlanAssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Liabilities: |  |
Deferred compensation | $ 4,947 us-gaap_DeferredCompensationLiabilityCurrentAndNoncurrent / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | $ 3,688 us-gaap_DeferredCompensationLiabilityCurrentAndNoncurrent / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member

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- Definition Deferred compensation plan assets fair value disclosure. + References No definition available. + Details
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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
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