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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
Allowance for doubtful accounts |  |  |
Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Valuation allowances and reserves, beginning balance |  | $ 706 | $ 1,127
Additions (Reductions) Charged to Expense |  | 77 | 359
Additions (Reductions) Charged to Other Accounts |  | 8 | (199)
Deductions | [1] | (461) | (581)
Valuation allowances and reserves, ending balance |  | 330 | 706
Inventory obsolescence reserve |  |  |
Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Valuation allowances and reserves, beginning balance |  | 3,308 | 3,022
Additions (Reductions) Charged to Expense |  | 657 | 571
Additions (Reductions) Charged to Other Accounts |  | 91 | 0
Deductions | [2] | (197) | (285)
Valuation allowances and reserves, ending balance |  | 3,859 | 3,308
Inventory LIFO reserve |  |  |
Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Valuation allowances and reserves, beginning balance |  | 8,026 | 8,508
Additions (Reductions) Charged to Expense |  | 293 | (482)
Additions (Reductions) Charged to Other Accounts |  | 0 | 0
Deductions |  | 0 | 0
Valuation allowances and reserves, ending balance |  | 8,319 | 8,026
Deferred tax valuation allowance |  |  |
Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Valuation allowances and reserves, beginning balance |  | 4,399 | 1,095
Additions (Reductions) Charged to Expense |  | 6,117 | 3,304
Additions (Reductions) Charged to Other Accounts |  | (919) | 0
Deductions |  | 0 | 0
Valuation allowances and reserves, ending balance |  | 9,597 | 4,399
Workers’ compensation reserve |  |  |
Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Valuation allowances and reserves, beginning balance |  | 324 | 688
Additions (Reductions) Charged to Expense |  | 234 | 157
Additions (Reductions) Charged to Other Accounts |  | 1 | 0
Deductions | [3] | (322) | (521)
Valuation allowances and reserves, ending balance |  | $ 237 | $ 324
[1] | Accounts determined to be uncollectible, net of recoveries
[2] | Inventory sold or otherwise disposed
[3] | (c)Payment of workers’ compensation claims

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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- Definition Amount of increase in the allowances and reserves, which consist of the valuation and qualifying accounts that are either netted against the cost of an asset or that reflect a liability established to represent expected future costs, from charges to costs and expenses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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- Definition Amount of increase in the allowances and reserves, which consist of the valuation and qualifying accounts that are either netted against the cost of an asset or that reflect a liability established to represent expected future costs, from charges to accounts other than costs and expenses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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- Definition Total of the deductions in a given period to allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, representing receivables written off as uncollectible and portions of the reserves utilized, respectively. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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