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INCOME TAXES, Rate Reconciliation (Details) | 1 Months Ended | 2 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 31, 2018 | Dec. 21, 2017 | Oct. 31, 2018 | Oct. 31, 2017 | Oct. 31, 2016
Federal statutory income tax rate | 21.00% | 35.00% | 23.30% | 35.00% | 35.00%
State taxes, less applicable federal income tax reduction |  |  | 2.90% | 1.90% | 1.70%
Discrete net tax benefit related to Tax Act |  |  | (3.40%) | 0.00% | 0.00%
Research and development tax credits |  |  | (2.00%) | (1.80%) | (2.70%)
Domestic production activities tax deduction |  |  | (0.80%) | (1.10%) | (1.30%)
Tax benefit related to stock option exercises (ASU 2016-09 adoption) |  |  | (0.50%) | (1.00%) | 0.00%
Noncontrolling interests' share of income |  |  | 0.30% | 0.70% | 0.70%
Tax-exempt (gains) losses on corporate-owned life insurance policies |  |  | (0.10%) | 1.80% | 0.10%
Other, net |  |  | 0.50% | (0.20%) | (0.40%)
Effective tax rate |  |  | 19.80% | 30.30% | 31.50%

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