Earnings per Share and Stock-Based Compensation - Reconciliation of Denominator of Each Net Income/(Loss) Per Share (Detail) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Jul. 31, 2013	Jul. 31, 2012	Jul. 31, 2013	Jul. 31, 2012
Earnings Per Share [Abstract]
Shares used in computing basic net income/(loss) per share	167,624	164,518	166,735	163,930
Dilutive effect of stock options and restricted stock	4,200	1,918
Dilutive effect of stock warrants	18,744	7,463
Shares used in computing diluted net income/(loss) per share	190,568	173,899	166,735	163,930