Consolidated Statements of Shareholders' Equity (USD $) In Thousands, unless otherwise specified	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 [Member]	Appropriated Retained Earnings (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, 2011		$ 2	$ 450		$ (4,441)	$ 1,340	$ (3,867)	$ 466,931	$ 889	$ 461,304	$ 100,824
Net income	190,327						16,352	150,347	2,747	169,446	20,881
Other comprehensive income (loss)	1,290					1,290				1,290
Dividends declared								(65,867)		(65,867)
Issuance of Voting Common Stock				56						56
Issuance of Non-Voting Common Stock:
On exercise of stock options			4	17,328	(211)					17,121
Under employee stock purchase plan			1	3,653						3,654
Under employee incentive plan				2,068						2,068
Under restricted stock plan, net of forfeitures			5							5
Stock-based compensation				42,819						42,819
Tax benefit of stock option exercises				2,228						2,228
Repurchase of Non-Voting Common Stock	76,586		(12)	(65,210)				(11,364)		(76,586)
Principal repayments on notes receivable from stock option exercises					764					764
Net subscriptions (redemptions/distributions) of non-controlling interest holders									(2,613)	(2,613)	29,751
Deconsolidation											(21,586)
Reclass to temporary equity									(132)	(132)	132
Purchase of non-controlling interests											(19,864)
Other changes in non-controlling interests				(2,942)						(2,942)	2,942
Ending balance, at Jul. 31, 2012		2	448		(3,888)	2,630	12,485	540,047	891	552,615	113,080
Beginning balance, at Oct. 31, 2012	613,585	2	453	26,730	(4,155)	3,923	18,699	566,420	1,513	613,585	98,765
Net income	158,297						(5,592)	136,689	3,964	135,061	23,236
Other comprehensive income (loss)	(3,237)					(3,237)				(3,237)
Dividends declared								(192,075)		(192,075)
Issuance of Non-Voting Common Stock:
On exercise of stock options			18	98,968	(4,734)					94,252
Under employee stock purchase plan			1	3,516						3,517
Under employee incentive plan				2,079						2,079
Under restricted stock plan, net of forfeitures			5							5
Stock-based compensation				40,446						40,446
Tax benefit of stock option exercises				15,682						15,682
Repurchase of Voting Common Stock				(73)						(73)
Repurchase of Non-Voting Common Stock	48,162		(5)	(48,157)						(48,162)
Principal repayments on notes receivable from stock option exercises					2,028					2,028
Net subscriptions (redemptions/distributions) of non-controlling interest holders									(3,922)	(3,922)	63,796
Deconsolidation											(61,023)
Reclass to temporary equity									(224)	(224)	224
Purchase of non-controlling interests											(46,601)
Issuance of subsidiary equity											13,927
Other changes in non-controlling interests				(4,727)						(4,727)	4,727
Ending balance, at Jul. 31, 2013	$ 654,235	$ 2	$ 472	$ 134,464	$ (6,861)	$ 686	$ 13,107	$ 511,034	$ 1,331	$ 654,235	$ 97,051