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Income Taxes (Effective Income Tax Rate Reconciliation) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
Income Tax Disclosure [Abstract] |  |  |
Statutory income tax amount | $ 1,890 | $ 1,567 | $ 2,341
State taxes, net of federal benefits | 319 | 392 | 196
Transaction costs | 60 | 143 | 0
Employee stock purchase plan | 79 | 127 | 59
Foreign operations | 556 | 431 | 225
Non-deductible executive compensation | 150 | 115 | 171
Change in valuation allowance | (2,187) | 173 | 520
Utilization of research and development tax credits | (3,116) | (2,881) | (2,173)
Deferred balance sheet remeasure | (952) | 0 | 9
ASU 2016-09 excess stock compensation | (1,131) | (673) | (56)
Contingent consideration | 1,212 | (27) | 250
Changes from provision to return | (458) | (111) | (511)
Adjustment of tax contingency reserves | 329 | 151 | 146
U.S. deduction for foreign export sales | (630) | (355) | (146)
Global intangible low-taxed income | 33 | 31 | 162
Other, net | 178 | (31) | (6)
Income tax (benefit) expense | (1,367) | (948) | 1,187
Effective Income Tax Rate Reconciliation, Capital Loss Expiration | $ 2,301 | $ 0 | $ 0

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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=121826272&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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