XML 39 R29.htm IDEA: XBRL DOCUMENT
v3.22.2

Overview and Summary of Significant Accounting Policies (Details) | 9 Months Ended
--- | ---
Jun. 30, 2022
Accounting Policies [Abstract] |
Predecessor companies founded | 75 years

X
- Definition Predecessor Company Founded Period + References No definition available. + Details
Name: | powl_PredecessorCompanyFoundedPeriod
Namespace Prefix: | powl_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration