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Fair Value Measurements (Narrative) (Details)	12 Months Ended
	Sep. 30, 2015 USD ($)
Fair Value Disclosures [Abstract]
Transfers between measurement levels	$ 0

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

- References

No definition available.

+ Details

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