Significant Accounting Policies - Reconciliation of Denominator of Each Net Loss Per Share (Detail) In Thousands, unless otherwise specified	12 Months Ended
	Oct. 31, 2014		Oct. 31, 2013		Oct. 31, 2012
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares used in computing basic net loss per share	170,492		167,255		164,245
Shares used in computing diluted net loss per share	170,492		167,255		164,245
Stock Options and Restricted Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Dilutive effect of stock	0	[1]	0	[1]	0	[1]
Warrant [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Dilutive effect of stock	0	[1]	0	[1]	0	[1]

[1] For fiscal 2014, 2013 and 2012, the shares used in computing diluted net loss per share do not include 2,145,000, 3,862,000, and 3,103,000 dilutive stock options and shares of restricted stock, respectively, nor 17,024,000, 17,792,000, and 11,559,000 dilutive warrant shares, respectively, as the effect is anti-dilutive given the Company’s loss. For fiscal 2014, 2013 and 2012, additional stock options outstanding of 4,856,000, 5,409,000, and 10,559,000, respectively, and additional warrant shares outstanding of 8,630,000, 7,862,000, and 14,095,000, respectively, were excluded from the calculation of diluted net loss per share, as their effect would have been anti-dilutive based on the application of the treasury stock method.