Earnings per Share and Stock-Based Compensation - Reconciliation of Denominator of Each Net Loss per Share (Parenthetical) (Detail)	3 Months Ended		9 Months Ended
	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2014	Jul. 31, 2013
Dilutive Stock Options and Restricted Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded in computing diluted net loss per share	1,572,000		2,922,000	4,016,000
Additional shares excluded from calculation of diluted EPS	5,710,000	5,763,000	4,364,000	6,286,000
Dilutive Stock Warrants [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded in computing diluted net loss per share	14,950,000		18,490,000	17,596,000
Additional shares excluded from calculation of diluted EPS	10,704,000	6,910,000	7,164,000	8,058,000