Earnings per Share and Stock-Based Compensation - Schedule of Performance Based Options and Performance Based Restricted Stock Units (Detail)	6 Months Ended
	Apr. 30, 2013
Performance Based Equity Instruments [Line Items]
Non-vested, ending balance shares	2,700,000
Performance Options [Member]
Performance Based Equity Instruments [Line Items]
Non-vested, beginning balance shares	856,000
Vested
Canceled	(112,000)
Non-vested, ending balance shares	744,000
Performance Restricted Stock Units [Member]
Performance Based Equity Instruments [Line Items]
Non-vested, beginning balance shares	7,929,375
Granted	5,750,000
Vested
Canceled	(2,097,343)
Non-vested, ending balance shares	11,582,032