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Detail of Selected Balance Sheet Accounts (Activity in Allowance for Doubtful Accounts) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Balance Sheet Related Disclosures [Abstract]    
Balance at beginning of period $ 1,577us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 572us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Bad debt expense/(recovery) 283powl_ProvisionForRecoveryOfDoubtfulAccounts 15powl_ProvisionForRecoveryOfDoubtfulAccounts
Uncollectible accounts written off, net of recoveries (2)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs 88us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs
Change in foreign currency translation (14)powl_IncreaseDecreaseDueToForeignCurrencyTranslation (2)powl_IncreaseDecreaseDueToForeignCurrencyTranslation
Balance at end of period $ 1,844us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 673us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent