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Income Taxes - Rate reconciliation (Details)
10 Months Ended 12 Months Ended
Jan. 01, 2018
Dec. 31, 2017
Oct. 31, 2018
Dec. 31, 2019
Oct. 31, 2019
Oct. 31, 2018
Oct. 31, 2017
Income Taxes              
Federal statutory tax rate 21.00% 35.00% 23.30% 21.00% 21.00% 23.30% 35.00%
State taxes, net of federal effects         3.70% 3.60% 2.90%
Foreign income taxes greater than U.S.         0.40% 0.70% 0.10%
Revaluation of deferred taxes           4.50%  
Section 199 deduction           (1.90%) (2.20%)
Provision to return         0.70% (1.20%)  
Transition Tax           0.60%  
State rate change         (0.20%) 0.20% 0.30%
Other         0.40% (1.40%) (0.70%)
Effective Income Tax Rate, Total         26.00% 28.40% 35.40%