Stockholders' Equity - Schedule of Activity Related to Performance Based Options and Performance Based Restricted Stock Units (Detail) - shares	12 Months Ended
	Oct. 31, 2015	Jul. 31, 2015	Oct. 31, 2014	Oct. 31, 2013
Performance Restricted Stock Units [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number	5,061,984		5,696,273	6,044,792
Performance Options [Member]
Performance Restricted Stock Units [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number	298,000
Non-vested, October 31, 2013 (shares)	640,000
Granted (shares)	0
Vested (shares)	0
Canceled (shares)	(124,000)
Non-vested, October 31, 2014 (shares)	516,000
Performance Restricted Stock Units [Member]
Performance Restricted Stock Units [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number		0
Non-vested, October 31, 2013 (shares)	10,218,508
Granted (shares)	1,844,000
Vested (shares)	0
Canceled (shares)	(2,296,080)
Non-vested, October 31, 2014 (shares)	9,766,428