Related Party Transactions (Details) (USD $)	12 Months Ended
	Oct. 31, 2014	Oct. 31, 2013	Oct. 31, 2012
Sponsored Funds [Abstract]
Investment advisory and administrative fees	$ 900,478,000	$ 828,441,000	$ 744,351,000
Distribution fees	77,697,000	80,073,000	80,920,000
Service fees	125,713,000	126,560,000	126,345,000
Shareholder services fees	2,315,000	2,522,000	2,411,000
Other revenue	2,093,000	1,211,000	0
Total	1,108,296,000	1,038,807,000	954,027,000
Investment advisory fees waived by the Company	12,300,000	9,600,000	8,800,000
Proceeds from sales	79,829,000	62,263,000	60,726,000
Net realized gains (losses)	(81,000)	5,742,000	(92,000)
Related party expenses	21,700,000	23,900,000	18,900,000
Related party accounts receivable	94,500,000	94,000,000
Employee Loan Program
Maximum loan amount available under the plan	$ 20,000,000
Minimum fixed borrowing rate under the plan	0.90%
Maximum fixed borrowing rate under the plan	3.40%