Derivative Financial Instruments Not Designated for Hedge Accounting (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Apr. 30, 2012	Apr. 30, 2011	Apr. 30, 2012	Apr. 30, 2011	Oct. 31, 2011
Foreign Exchange Contracts [Member]
Derivative Instruments Not Designated As Hedging Instruments [Line Items]
Other assets fair value	$ 20		$ 20		$ 24
Other liabilities fair value	185		185		124
Net gains (losses) recognized	195	(2,196)	428	(1,917)
Stock Index Futures Contracts [Member]
Derivative Instruments Not Designated As Hedging Instruments [Line Items]
Other assets fair value	431		431		157
Other liabilities fair value	255		255		6,363
Net gains (losses) recognized	(5,756)	(4,373)	(9,901)	(8,841)
Commodity Futures Contracts [Member]
Derivative Instruments Not Designated As Hedging Instruments [Line Items]
Other assets fair value	454		454		879
Other liabilities fair value	105		105		167
Net gains (losses) recognized	519	(728)	1,013	(2,192)
Total [Member]
Derivative Instruments Not Designated As Hedging Instruments [Line Items]
Other assets fair value	905		905		1,060
Other liabilities fair value	545		545		6,654
Net gains (losses) recognized	$ (5,042)	$ (7,297)	$ (8,460)	$ (12,950)