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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 | 6 Months Ended
--- | --- | ---
Mar. 31, 2014 | Mar. 31, 2013 | Mar. 31, 2014 | Mar. 31, 2013
Detail of Selected Balance Sheet Accounts [Abstract] |  |  |  |
Balance at beginning of period | $ 673 | $ 928 | $ 572 | $ 1,297
Bad debt recovery | (170) | (59) | (60) | (380)
Uncollectible accounts written off, net of recoveries |  | (28) | (9) | (85)
Change in foreign currency translation | (2) | (23) | (2) | (14)
Balance at end of period | $ 501 | $ 818 | $ 501 | $ 818

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- Definition A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 4 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5074-111524 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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