Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified						9 Months Ended
	Jul. 31, 2013	Oct. 31, 2012	Jul. 31, 2013 Fair Value, Measurements, Recurring [Member] Total [Member]	Jul. 31, 2013 Fair Value, Measurements, Recurring [Member] Level 1 [Member]	Jul. 31, 2013 Fair Value, Measurements, Recurring [Member] Level 2 [Member]	Jul. 31, 2013 Fair Value, Measurements, Recurring [Member] Level 3 [Member]
Assets:
U.S. government obligations	$ 115,003		$ 115,003	$ 115,003	$ 0	$ 0
Foreign currency forward contracts			261	0	261	0
Embedded redemption feature	2,510	420	2,510	0	0	2,510
Total assets measured at fair value			117,774	115,003	261	2,510
Liabilities:
Foreign currency forward contracts			575	0	575	0
Total liabilities measured at fair value			575	0	575	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)						2,720
Transfers into Level 3						0
Transfers out of Level 3						0
Balance at July 31, 2013						$ 2,510