Derivative Financial (Other Derivative Financial Instruments Not Designated for Hedge Accounting (Details) $ in Thousands	3 Months Ended
	Jan. 31, 2020 USD ($) Number	Jan. 31, 2019 USD ($)	Oct. 31, 2019 USD ($) Number
Derivative [Line Items]
Total other assets fair value	$ 2,966		$ 2,074
Total other liabilities fair value	4,165		3,314
Net gains (losses)	(3,638)	$ (2,373)
Collateral Pledged [Member]
Derivative [Line Items]
Other assets, restricted cash	$ 12,200		$ 7,500
Credit Default Swap Contracts [Member]
Derivative [Line Items]
Number of contracts | Number	1		1
Notional amount of other derivative financial instruments not designated for hedge accounting	$ 8,000		$ 8,000
Total other assets fair value	341		360
Total other liabilities fair value	0		$ 0
Net gains (losses)	$ (40)	(83)
Total Return Swap Contracts [Member]
Derivative [Line Items]
Number of contracts | Number	2		2
Notional amount of other derivative financial instruments not designated for hedge accounting	$ 84,000		$ 84,000
Total other assets fair value	0		396
Total other liabilities fair value	1,064		$ 114
Net gains (losses)	$ (1,381)	(2,185)
Stock Index Futures Contracts [Member]
Derivative [Line Items]
Number of contracts | Number	1,239		1,370
Notional amount of other derivative financial instruments not designated for hedge accounting	$ 112,000		$ 108,300
Total other assets fair value	497		615
Total other liabilities fair value	1,199		$ 1,841
Net gains (losses)	$ (2,619)	(216)
Commodity Futures Contracts [Member]
Derivative [Line Items]
Number of contracts | Number	416		415
Notional amount of other derivative financial instruments not designated for hedge accounting	$ 15,700		$ 15,200
Total other assets fair value	1,085		319
Total other liabilities fair value	472		$ 334
Net gains (losses)	$ 425	870
Foreign Exchange Contract [Member]
Derivative [Line Items]
Number of contracts | Number	36		26
Notional amount of other derivative financial instruments not designated for hedge accounting	$ 51,400		$ 56,400
Total other assets fair value	589		51
Total other liabilities fair value	611		$ 615
Net gains (losses)	$ 134	(284)
Currency Futures Contracts [Member]
Derivative [Line Items]
Number of contracts | Number	206		231
Notional amount of other derivative financial instruments not designated for hedge accounting	$ 24,900		$ 24,000
Total other assets fair value	350		128
Total other liabilities fair value	33		$ 153
Net gains (losses)	$ 55	36
Interest Rate Futures Contracts [Member]
Derivative [Line Items]
Number of contracts | Number	171		151
Notional amount of other derivative financial instruments not designated for hedge accounting	$ 28,800		$ 22,300
Total other assets fair value	98		144
Total other liabilities fair value	449		$ 22
Net gains (losses)	$ (51)	(511)
Interest Rate Swap Contracts [Member]
Derivative [Line Items]
Number of contracts | Number	6		6
Notional amount of other derivative financial instruments not designated for hedge accounting	$ 21,600		$ 24,400
Total other assets fair value	6		61
Total other liabilities fair value	337		$ 235
Net gains (losses)	$ (161)	$ 0