Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2018
Consolidated Statements of Comprehensive Income [Abstract]
Net income	$ 133,334	$ 432,876	$ 397,905
Other comprehensive income (loss):
Amortization of net losses on cash flow hedges, net of tax	(100)	(100)	(101)
Unrealized gains (losses) on available-for-sale investments, net of tax	0	0	(414)
Foreign currency translation adjustments	(4,859)	(1,322)	(5,192)
Other comprehensive loss, net of tax	(4,959)	(1,422)	(5,707)
Total comprehensive income	128,375	431,454	392,198
Comprehensive (income) loss attributable to non-controlling and other beneficial interests	5,182	(32,841)	(15,967)
Total comprehensive income attributable to Eaton Vance Corp. shareholders	$ 133,557	$ 398,613	$ 376,231