XML 38 R45.htm IDEA: XBRL DOCUMENT
v2.4.1.9

Fair Value Measurements (Narrative) (Details) (USD $) | 6 Months Ended
--- | ---
Mar. 31, 2015
Fair Value Disclosures [Abstract] |
Transfers between measurement levels | $ 0 powl_AmountOfTransfersBetweenFairValueMeasurementLevels

X
- Definition Amount of transfers between fair value measurement levels. + References No definition available. + Details
Name: | powl_AmountOfTransfersBetweenFairValueMeasurementLevels
Namespace Prefix: | powl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_FairValueDisclosuresAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration