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Amount of gain (loss) recognized in earnings, arising from assets measured at fair value on a recurring basis using unobservable inputs (level 3).

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Issues that have taken place during the period in relation to assets measured at fair value and categorized within Level 3 of the fair value hierarchy.

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This element represents an asset measured at fair value using significant unobservable inputs (Level 3) which is required for reconciliation purposes of beginning and ending balances.

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Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified						6 Months Ended
	Apr. 30, 2013	Oct. 31, 2012	Apr. 30, 2013 Fair Value, Measurements, Recurring [Member] Total [Member]	Apr. 30, 2013 Fair Value, Measurements, Recurring [Member] Level 1 [Member]	Apr. 30, 2013 Fair Value, Measurements, Recurring [Member] Level 2 [Member]	Apr. 30, 2013 Fair Value, Measurements, Recurring [Member] Level 3 [Member]
Assets:
U.S. government obligations	$ 99,973	$ 50,057	$ 99,973	$ 99,973	$ 0	$ 0
Foreign currency forward contracts			52	0	52	0
Embedded redemption feature	220	420	220	0	0	220
Total assets measured at fair value			100,245	99,973	52	220
Liabilities:
Foreign currency forward contracts			67	0	67	0
Total liabilities measured at fair value			67	0	67	0
Reconciliation of changes in Level 3 fair value measurements
Balance at October 31, 2012						420
Issuances						0
Settlements						(630)
Changes in unrealized gain (loss)						(430)
Transfers into Level 3						0
Transfers out of Level 3						0
Balance at April 30, 2013						$ 220