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Income Taxes - Income Taxes Computed at the U.S. Statutory Rate and Income Tax (Detail)	2 Months Ended	10 Months Ended	12 Months Ended
	Dec. 31, 2017	Oct. 31, 2018	Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2017
Income Tax Disclosure [Abstract]
Statutory federal income tax rate	35.00%	21.00%	21.00%	23.34%	35.00%
Transition tax			1.46%	6.16%
Tax rate change deferred tax remeasurement				(10.94%)
Share-based and other compensation			(0.55%)	(1.45%)
Domestic production deduction				(0.82%)	(1.48%)
Foreign tax rate variances, net of foreign tax credits			1.16%	(0.46%)	(4.69%)
State and local taxes, net of federal income tax benefit			0.74%	0.45%	0.76%
Amounts related to prior years			(0.55%)	(0.21%)	0.03%
Foreign-Derived Intangible Income Deduction			(1.51%)
Global Intangible Low-Taxed Income net of foreign tax credits			0.85%
Other – net			(0.79%)	(0.21%)
Effective tax rate			21.81%	15.86%	29.62%

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