Earnings per Share and Stock-Based Compensation - Schedule of Changes in Non-Vested Shares Under Option, Excluding Performance Based Options (Detail) (Non-performance based options [Member], USD $)	3 Months Ended
	Jan. 31, 2013
Non-performance based options [Member]
Nonvested Share Activity [Line Items]
Non-vested, beginning balance shares	4,422,172
Granted, Shares
Vested, Shares	(1,189,675)
Canceled, Shares	(76,901)
Non-vested, ending balance shares	3,155,596
Non-vested, Weighted-Average Grant Date Fair Value, beginning balance	$ 1.92
Granted, Weighted-Average Grant Date Fair Value
Vested, Weighted-Average Grant Date Fair Value	$ 2.30
Canceled, Weighted-Average Grant Date Fair Value	$ 1.55
Non-vested, Weighted-Average Grant Date Fair Value, ending balance	$ 1.87