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Fair Value Measurements (Details) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Apr. 30, 2012
Oct. 31, 2011
Apr. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Apr. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
U.S. government obligations [Member]
Apr. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Embedded redemption feature [Member]
Apr. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Apr. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
U.S. government obligations [Member]
Apr. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Embedded redemption feature [Member]
Apr. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Apr. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
U.S. government obligations [Member]
Apr. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Embedded redemption feature [Member]
Apr. 30, 2012
Fair Value, Measurements, Recurring [Member]
Total [Member]
Apr. 30, 2012
Fair Value, Measurements, Recurring [Member]
Total [Member]
U.S. government obligations [Member]
Apr. 30, 2012
Fair Value, Measurements, Recurring [Member]
Total [Member]
Embedded redemption feature [Member]
Assets:                            
U.S. government obligations $ 50,166 $ 50,264   $ 50,166     $ 0     $ 0     $ 50,166  
Foreign currency forward contracts     0     373     0     373    
Embedded redemption feature 2,290 7,020     0     0     2,290     2,290
Total assets measured at fair value     50,166     373     2,290     52,829    
Reconciliation of changes in Level 3 fair value measurements                            
Balance at October 31, 2011                 7,020          
Issuances                 0          
Settlements                 0          
Changes in unrealized gain (loss)                 (4,730)          
Transfers into Level 3                 0          
Transfers out of Level 3                 0          
Balance at January 31, 2012                 $ 2,290