Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Total	Voting Common Stock [Member]	Non-Voting Common Stock [Member]	Additional Paid-In Capital [Member]	Notes Receivable From Stock Option Exercises [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Appropriated Deficit [Member]	Retained Earnings [Member]	Non-Redeemable Non-Controlling Interests [Member]	Total Permanent Equity [Member]	Redeemable Non-Controlling Interests [Member]
Beginning balance, at Oct. 31, 2015		$ 2	$ 451	$ 0	$ (11,143)	$ (48,586)	$ (5,338)	$ 684,845	$ 1,725	$ 621,956	$ 88,913
Net income	$ 63,232						1,912	58,386	932	61,230	2,002
Other comprehensive loss	(14,720)					(14,720)				(14,720)
Dividends declared								(30,493)		(30,493)
Issuance of Voting Common Stock				232						232
Issuance of Non-Voting Common Stock:
On exercise of stock options			1	5,667	(531)					5,137
Under employee stock purchase plans				1,610						1,610
Under employee stock purchase incentive plan				255						255
Under restricted stock plan, net of forfeitures			5							5
Stock-based compensation				18,234						18,234
Tax benefit of stock option exercises				2,261						2,261
Repurchase of Voting Common Stock				(77)						(77)
Repurchase of Non-Voting Common Stock	73,341		(9)	(28,135)				(45,197)		(73,341)
Principal repayments on notes receivable from stock option exercises					972					972
Net subscriptions (redemptions/distributions) of non-controlling interest holders									(773)	(773)	400
Reclass to temporary equity									(119)	(119)	119
Purchase of non-controlling interests											(6,202)
Other changes in non-controlling interests				(47)						(47)	47
Ending balance, at Jan. 31, 2016		2	448	0	(10,702)	(63,306)	$ (3,426)	667,541	1,765	592,322	85,279
Beginning balance, at Oct. 31, 2016	704,575	2	444	0	(12,074)	(57,583)		773,000	786	704,575	109,028
Net income	64,341							60,711	892	61,603	2,738
Other comprehensive loss	6,128					6,128				6,128
Dividends declared								(32,260)		(32,260)
Issuance of Non-Voting Common Stock:
On exercise of stock options			3	26,215	(330)					25,888
Under employee stock purchase plans				1,516						1,516
Under employee stock purchase incentive plan				324						324
Under restricted stock plan, net of forfeitures			6							6
Stock-based compensation				20,178						20,178
Tax benefit of stock option exercises				4,858						4,858
Repurchase of Non-Voting Common Stock	53,601		(5)	(53,596)						(53,601)
Principal repayments on notes receivable from stock option exercises					2,263					2,263
Net subscriptions (redemptions/distributions) of non-controlling interest holders									(874)	(874)	44,152
Reclass to temporary equity									(64)	(64)	64
Purchase of non-controlling interests											(6,941)
Other changes in non-controlling interests				(377)						(377)	377
Ending balance, at Jan. 31, 2017	$ 743,822	$ 2	$ 448	2,777	$ (10,141)	$ (51,455)		$ 801,451	$ 740	743,822	$ 149,418
Issuance of Non-Voting Common Stock:
Tax benefit of non-controlling interest repurchases				$ 3,659						$ 3,659