Earnings per Share and Stock-Based Compensation - Schedule of Changes in Non-Vested Shares Under Option, Excluding Performance Based Options (Detail) (USD $)	9 Months Ended
	Jul. 31, 2013
Stockholders' Equity [Line Items]
Non-vested, ending balance, Shares	2,700,000
Non-performance based options [Member]
Stockholders' Equity [Line Items]
Non-vested, beginning balance, Shares	4,422,172
Granted, Shares	625,000
Vested, Shares	(2,069,593)
Canceled, Shares	(233,502)
Non-vested, ending balance, Shares	2,744,077
Non-vested, Weighted-Average Grant Date Fair Value, beginning balance	$ 1.92
Granted, Weighted-Average Grant Date Fair Value	$ 4.77
Vested, Weighted-Average Grant Date Fair Value	$ 2.24
Canceled, Weighted-Average Grant Date Fair Value	$ 1.95
Non-vested, Weighted-Average Grant Date Fair Value, ending balance	$ 2.42