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Income Taxes (Effective Income Tax Rate Reconciliation) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Income Tax Disclosure [Abstract] |  |  |
Statutory income tax amount | $ 1,567 | $ 2,341 | $ 809
State taxes, net of federal benefits | 392 | 196 | (71)
Manufacturing deduction | 0 | 0 | (364)
Transaction costs | 143 | 0 | 79
Employee stock purchase plan | 127 | 59 | 56
Foreign operations | 431 | 225 | 318
Non-deductible executive compensation | 115 | 171 | 27
Change in valuation allowance | 173 | 520 | (994)
Utilization of research and development tax credits | (2,881) | (2,173) | (1,971)
One-time transition tax | 0 | 0 | 250
Deferred balance sheet remeasure | 0 | 9 | 2,727
ASU 2016-09 excess stock compensation | (673) | (56) | 643
Contingent consideration | (27) | 250 | 388
Changes from provision to return | (111) | (511) | (554)
Adjustment of tax contingency reserves | 151 | 146 | 193
U.S. deduction for foreign export sales | (355) | (146) | 0
Global intangible low-taxed income | 31 | 162 | 0
Other, net | (31) | (6) | 83
Income tax (benefit) expense | $ (948) | $ 1,187 | $ 1,619

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- Definition Amount of difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to expense for award under share-based payment arrangement. Excludes expense determined to be nondeductible upon grant or after for award under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 740 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120384911&loc=d3e23163-113944 + Details
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