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 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 $ 132,687           12,701 113,353 1,863 127,917 4,770
Other comprehensive income (loss) 7,730         7,730       7,730  
Dividends declared               (60,495)   (60,495)  
Issuance of Voting Common Stock       232           232  
Issuance of Non-Voting Common Stock:                      
On exercise of stock options     3 22,056 (531)         21,528  
Under employee stock purchase plans       1,610           1,610  
Under employee stock purchase incentive plan       2,710           2,710  
Under restricted stock plan, net of forfeitures     6             6  
Stock-based compensation       36,607           36,607  
Tax benefit of stock option exercises       1,714           1,714  
Repurchase of Voting Common Stock       (77)           (77)  
Repurchase of Non-Voting Common Stock 144,071   (17) (63,737)       (80,317)   (144,071)  
Principal repayments on notes receivable from stock option exercises         1,283         1,283  
Net subscriptions (redemptions/distributions) of non-controlling interest holders                 (1,767) (1,767) (434)
Net consolidations (deconsolidations) of sponsored investment funds                     (698)
Reclass to temporary equity                 (119) (119) 119
Purchase of non-controlling interests                     (6,202)
Other changes in non-controlling interests       (1,115)           (1,115) 1,115
Ending balance, at Apr. 30, 2016   2 443 0 (10,391) (40,856) $ 7,363 657,386 1,702 615,649 87,583
Beginning balance, at Oct. 31, 2016 704,575 2 444 0 (12,074) (57,583)   773,000 786 704,575 109,028
Net income 141,974             132,686 1,837 134,523 7,451
Other comprehensive income (loss) (2,481)         (2,481)       (2,481)  
Dividends declared               (64,559)   (64,559)  
Issuance of Non-Voting Common Stock:                      
On exercise of stock options     6 41,873 (771)         41,108  
Under employee stock purchase plans       1,516           1,516  
Under employee stock purchase incentive plan       2,791           2,791  
Under restricted stock plan, net of forfeitures     6             6  
Stock-based compensation       39,214           39,214  
Tax benefit of stock option exercises       7,183           7,183  
Repurchase of Non-Voting Common Stock 78,984   (7) (78,977)           (78,984)  
Principal repayments on notes receivable from stock option exercises         2,660         2,660  
Net subscriptions (redemptions/distributions) of non-controlling interest holders                 (1,797) (1,797) 90,509
Net consolidations (deconsolidations) of sponsored investment funds                     (488)
Reclass to temporary equity                 (64) (64) 64
Purchase of non-controlling interests                     (7,310)
Other changes in non-controlling interests       (860)           (860) 860
Ending balance, at Apr. 30, 2017 $ 788,490 $ 2 $ 449 16,399 $ (10,185) $ (60,064)   $ 841,127 $ 762 788,490 $ 200,114
Issuance of Non-Voting Common Stock:                      
Tax benefit of non-controlling interest repurchases       $ 3,659           $ 3,659