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Income Taxes - Reconciliation of Income Taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Provision for income taxes attributable to continuing operations      
Income tax expense (benefit) at the federal statutory rate $ 3,374 $ (14,720) $ 878
State taxes, net of federal benefit 931 951 184
Mexico inflation adjustment (1,217) (1,120) (801)
Non-deductible items 2,087 772 2,088
Tax credits 0 0 (551)
Foreign rate differential 1,111 (1,671) 1,080
Change in valuation allowance (137) 962 1,601
Stock compensation 293 598 (711)
Uncertain tax positions 208 2,849 (1,596)
Non-deductible impairment 0 9,093 0
Deferred tax true-up 896 0 0
Other (96) 654 234
Total income tax expense (benefit) $ 7,450 $ (1,632) $ 2,406
Effective tax rate 46.00% 2.00% 58.00%