Earnings per Share and Stock-based Compensation - Schedule of Activity Related to Performance Based Equity Instruments (Detail)	9 Months Ended
	Jul. 31, 2015 shares
Activity related to these performance-based equity instruments
Outstanding, October 31, 2014 (shares)	6,817,609
Granted (shares)	9,990,000
Exercised (shares)	0
Canceled (shares)	(1,770,458)
Outstanding, July 31, 2015 (shares)	15,037,151
Performance Options
Activity related to these performance-based equity instruments
Outstanding, October 31, 2014 (shares)	640,000
Granted (shares)	0
Exercised (shares)	0
Canceled (shares)	(124,000)
Outstanding, July 31, 2015 (shares)	516,000
Performance Restricted Stock Units
Activity related to these performance-based equity instruments
Outstanding, October 31, 2014 (shares)	10,218,508
Granted (shares)	1,844,000
Exercised (shares)	0
Canceled (shares)	(2,296,080)
Outstanding, July 31, 2015 (shares)	9,766,428