Earnings per Share and Stock-Based Compensation - Reconciliation of Denominator of Each Net Loss per Share (Parenthetical) (Detail)	3 Months Ended		6 Months Ended
	Apr. 30, 2014	Apr. 30, 2013	Apr. 30, 2014	Apr. 30, 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	3,229,000	4,389,000	3,603,000	3,814,000
Additional shares excluded from calculation of diluted EPS	4,173,000	6,252,000	3,805,000	6,936,000
Dilutive Stock Warrants [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded in computing diluted net loss per share	19,113,000	18,074,000	19,542,000	16,833,000
Additional shares excluded from calculation of diluted EPS	6,541,000	7,580,000	6,112,000	8,821,000