Income Taxes (Schedule Of Tax Loss And Credit Carryforwards) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Oct. 31, 2011
Income Taxes [Line Items]
Federal net operating loss carryforward, Amount	$ 89,349
Federal Research [Member]
Income Taxes [Line Items]
Credit carryforward	74,388
Foreign Research [Member]
Income Taxes [Line Items]
Credit carryforward	25,662
State Research [Member]
Income Taxes [Line Items]
Credit carryforward	$ 67,757
Credit carryforward, Expiration Date	Indefinite
Maximum [Member]
Income Taxes [Line Items]
Federal net operating loss carryforward, Expiration Date	2030
Maximum [Member] | Federal Research [Member]
Income Taxes [Line Items]
Credit carryforward, Expiration Date	2031
Maximum [Member] | Foreign Research [Member]
Income Taxes [Line Items]
Credit carryforward, Expiration Date	2021
Minimum [Member]
Income Taxes [Line Items]
Federal net operating loss carryforward, Expiration Date	2018
Minimum [Member] | Federal Research [Member]
Income Taxes [Line Items]
Credit carryforward, Expiration Date	2018
Minimum [Member] | Foreign Research [Member]
Income Taxes [Line Items]
Credit carryforward, Expiration Date	2012