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, 2018	Oct. 31, 2017	Oct. 31, 2016
Income Tax Disclosure [Abstract]
Statutory federal income tax rate	35.00%	21.00%	23.34%	35.00%	35.00%
Transition Tax			6.16%
Tax Rate Change Deferred Tax Remeasurement			(10.94%)
Share-Based and Other Compensation			(1.45%)
Domestic Production Deduction			(0.82%)	(1.48%)	(1.43%)
Foreign tax rate variances, net of foreign tax credits			(0.46%)	(4.69%)	(4.59%)
State and local taxes, net of federal income tax benefit			0.45%	0.76%	0.50%
Amounts related to prior years			(0.21%)	0.03%	(1.20%)
Tax benefit from previously taxed dividends paid					(1.67%)
Other – net			(0.21%)		(0.38%)
Effective tax rate			15.86%	29.62%	26.23%