Related Party Transactions (Details) - USD ($)	3 Months Ended		6 Months Ended
	Apr. 30, 2017	Apr. 30, 2016	Apr. 30, 2017	Apr. 30, 2016	Oct. 31, 2016
Sponsored Funds
Management fees	$ 226,959,000	$ 193,851,000	$ 441,708,000	$ 395,398,000
Distribution fees	18,998,000	16,506,000	37,279,000	33,939,000
Service fees	30,067,000	25,794,000	58,978,000	53,053,000
Shareholder services fees	1,271,000	629,000	1,973,000	1,217,000
Other revenue	576,000	712,000	1,090,000	1,249,000
Total	277,871,000	237,492,000	541,028,000	484,856,000
Investment advisory fees waived by the Company	4,000,000	3,700,000	7,700,000	7,500,000
Proceeds from sales	1,000	214,000	3,734,000	8,298,000
Net realized gains (losses)	0	27,000	203,000	162,000
Related party expenses	8,400,000	5,400,000	16,000,000	11,800,000
Accounts Receivable, Related Parties, Sponsored Funds	93,400,000		93,400,000		$ 88,700,000
Accounts Payable, Related Parties, Sponsored Funds	1,800,000		1,800,000		1,600,000
Loan to Affiliate
Loan to affiliate	5,000,000		5,000,000		5,000,000
Interest income earned on loan to affiliate	39,000	36,000	79,000	52,000
Interest receivable on the loan to affiliate	13,000		$ 13,000		13,000
Description of the variable interest rate on the loan to affiliate			The loan earns interest equal to the one-year Canadian Dollar Offered Rate plus 200 basis points, which is payable quarterly in arrears.
Hexavest Related Parties Agreements
Sub-advisory fees paid to Hexavest	92,000	66,000	$ 200,000	100,000
Reimbursement of fund subsidies to the Company from Hexavest	21,000	51,000	71,000	100,000
Accounts Payable, Related Parties, Hexavest Subadvisory Agreement	58,000		58,000		51,000
Fees earned from Hexavest for the sale of institutional separately managed accounts	500,000	$ 500,000	1,100,000	$ 1,000,000
Accounts Receivable, Related Parties, Hexavest Cost Reimbursement Agreement	200,000		200,000		$ 300,000
Employee Loan Program
Maximum loan amount available under the plan	$ 20,000,000		$ 20,000,000