Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Jan. 31, 2018	Jan. 31, 2017
Earnings Per Share Reconciliation [Abstract]
Net income attributable to Eaton Vance Corp. shareholders	$ 78,056	$ 60,711
Weighted-average shares outstanding - basic	115,282	110,267
Incremental common shares	8,659	4,404
Weighted-average shares outstanding - diluted	123,941	114,671
Earnings per share (Basic) ($ per share)	$ 0.68	$ 0.55
Earnings per share (Diluted) ($ per share)	$ 0.63	$ 0.53
Antidilutive common shares	1,800	8,100