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Income Taxes - Reconciliation Between the Statutory U.S. Income Tax Rate and Effective Rate Derived by Dividing the Provision for Income Taxes by Earnings Before Income Taxes (Detail) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Income Tax Disclosure [Abstract]      
Computed income taxes at statutory rate $ 12,452 $ 6,627 $ 7,443
Increase (decrease) in taxes resulting from -      
State and local income taxes 773 577 982
U.S. tax law change     (2,655)
One-time repatriation tax     876
Foreign-Derived Intangible Income tax (136) (294)  
Global Intangible Low Taxed Income tax 4,970 1,119  
Foreign tax credit (4,767) (990) (15)
Foreign tax rate differences (534) 46 (104)
Transaction Costs 548    
Qualified domestic production incentives     (550)
Uncertain tax position activity 62 126 (62)
Valuation allowance (106) 106 (40)
Stock-based compensation 41 (33) 447
Other, net (196) (109) 209
Income Tax Provision $ 13,107 $ 7,175 $ 6,531
Computed income taxes at statutory rate 21.00% 21.00% 24.50%
State and local income taxes, rate 1.30% 1.80% 3.20%
U.S. tax law change, rate     (8.70%)
One-time repatriation tax, rate     2.90%
Foreign-Derived Intangible Income tax, rate (0.20%) (0.90%)  
Global Intangible Low Taxed Income tax, rate 8.40% 3.60%  
Foreign tax credit, rate (8.00%) (3.10%)  
Foreign tax rate differences, rate (0.90%) 0.10% (0.30%)
Transaction costs rate 0.90%    
Qualified domestic production incentives, rate     (1.80%)
Uncertain tax position activity, rate 0.10% 0.40% (0.20%)
Valuation allowance, rate (0.20%) (0.30%) (0.10%)
Stock-based compensation, rate 0.10% (0.10%) 1.40%
Other, net, rate (0.40%) (0.40%) (0.60%)
Total, rate 22.10% 22.70% 21.50%