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Detail of Selected Balance Sheet Accounts (Activity in Product Warranty Accrual) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2015 | Mar. 31, 2014
Balance Sheet Related Disclosures [Abstract] |  |  |  |
Balance at beginning of period | $ 4,480 us-gaap_ProductWarrantyAccrualClassifiedCurrent | $ 5,010 us-gaap_ProductWarrantyAccrualClassifiedCurrent | $ 4,557 us-gaap_ProductWarrantyAccrualClassifiedCurrent | $ 5,282 us-gaap_ProductWarrantyAccrualClassifiedCurrent
Increase to warranty expense | 530 us-gaap_ProductWarrantyAccrualWarrantiesIssued | 1,042 us-gaap_ProductWarrantyAccrualWarrantiesIssued | 1,067 us-gaap_ProductWarrantyAccrualWarrantiesIssued | 1,505 us-gaap_ProductWarrantyAccrualWarrantiesIssued
Deduction for warranty charges | (504)us-gaap_ProductWarrantyAccrualPayments | (1,196)us-gaap_ProductWarrantyAccrualPayments | (1,028)us-gaap_ProductWarrantyAccrualPayments | (1,926)us-gaap_ProductWarrantyAccrualPayments
Increase (decrease) due to foreign currency translations | (131)us-gaap_ProductWarrantyAccrualCurrencyTranslationIncreaseDecrease | (23)us-gaap_ProductWarrantyAccrualCurrencyTranslationIncreaseDecrease | (221)us-gaap_ProductWarrantyAccrualCurrencyTranslationIncreaseDecrease | (28)us-gaap_ProductWarrantyAccrualCurrencyTranslationIncreaseDecrease
Balance at end of period | $ 4,375 us-gaap_ProductWarrantyAccrualClassifiedCurrent | $ 4,833 us-gaap_ProductWarrantyAccrualClassifiedCurrent | $ 4,375 us-gaap_ProductWarrantyAccrualClassifiedCurrent | $ 4,833 us-gaap_ProductWarrantyAccrualClassifiedCurrent

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- Definition Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers. For classified balance sheets, represents the current portion of the liabilities (due within one year or within the normal operating cycle if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 25 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6397716&loc=d3e11281-110244 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12524-110249 + Details
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- Definition Total Increase or Decrease in the standard and extended product warranty liability due to currency translation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249 + Details
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- Definition Represents the aggregate decrease in the liability related to payments to satisfy claims for standard and extended product warranties. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph ((c)(2)) -URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249 + Details
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- Definition Represents the aggregate increase in the liability for accruals related to standard and extended product warranties issued during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph ((c)(3)) -URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249 + Details
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