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Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Valuation And Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at Beginning of Period | $ 2,449 | $ 2,516 |
Balance at Beginning of Period | 9,674 | 6,675 |
Balance at End of Period | 1,395 | 2,449 | $ 2,516
Balance at End of Period | 29,614 | 9,674 | 6,675
Inventory Obsolescence Reserve |  |  |
Valuation And Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at Beginning of Period | 9,674 | 6,675 | 7,764
Charged to Costs and Expenses | 21,472 | 10,590 | 3,887
(Deductions) and Additions | (1,532) | (7,591) | (4,976)
Balance at End of Period | 29,614 | 9,674 | 6,675
Allowance for Doubtful Accounts on Accounts and Financing Receivables |  |  |
Valuation And Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at Beginning of Period | 2,949 | 2,516 | 1,125
Charged to Costs and Expenses | (380) | 763 | 2,147
(Deductions) and Additions | (154) | (330) | (756)
Balance at End of Period | $ 2,415 | $ 2,949 | $ 2,516

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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 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 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=66008989&loc=d3e5074-111524 + Details
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