Income Taxes (Components of Deferred Income Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands	Oct. 31, 2019	Oct. 31, 2018
Deferred tax assets:
Stock-based compensation	$ 45,505	$ 41,759
Investment basis in partnerships	25,245	10,050
Deferred rent	8,017	8,129
Differences between book and tax bases of investments	7,893	6,988
Compensation and benefit expense	5,259	4,202
Differences between book and tax bases of goodwill and intangibles	282	247
Other	193	240
Total deferred tax asset	92,394	71,615
Deferred tax liabilities:
Deferred sales commissions	(14,189)	(12,422)
Differences between book and tax bases of property	(7,270)	(6,691)
Differences between book and tax bases of goodwill and intangibles	(8,218)	(5,008)
Unrealized net holding gains on investments	0	(1,579)
Unrealized gains on derivative instruments	(56)	(89)
Total deferred tax liability	(29,733)	(25,789)
Net deferred tax asset	$ 62,661	$ 45,826