Earnings per Share and Stock-Based Compensation - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	9 Months Ended							9 Months Ended
	Jul. 31, 2013	Jul. 31, 2013 Performance Based Restricted Stock Units [Member]	Jul. 31, 2012 Performance Based Restricted Stock Units [Member]	Jul. 31, 2013 Performance Based Options [Member]	Jul. 31, 2013 Restricted Stock [Member]	Apr. 30, 2013 Restricted Stock [Member]	Mar. 31, 2010 Restricted Stock [Member]	Jul. 31, 2013 Non-performance based options [Member]	Jul. 31, 2012 Non-performance based options [Member]	Oct. 31, 2012 Non-performance based options [Member]
Stockholders' Equity [Line Items]
Percentage of risk-free interest, minimum		0.40%
Percentage of risk-free interest, maximum		0.80%
Percentage of risk-free interest			0.70%					1.60%	1.10%
Percentage of volatility, minimum		59.00%
Percentage of volatility, maximum		89.00%
Percentage of volatility			91.00%					78.10%	76.50%
Amount for dividend yield		0.00%						0.00%
Weighted average fair value of the restricted stock units		$ 4.19	$ 2.27					$ 2.42		$ 1.92
Total unrecognized compensation expenses		$ 13.0		$ 1.0	$ 0.5			$ 2.7
Unrecognized compensation expenses expected to be recognized over weighted average period		9 months 18 days		2 years 3 months 18 days	1 year 7 months 6 days			1 year 10 months 24 days
Period for expected life								7 years 1 month 6 days	7 years 1 month 6 days
Weighted average fair value of options granted								$ 4.77	$ 2.58
Period for stock issued vested in plan					3 years			3 years
Non-vested shares under option	2,700,000							2,744,077		4,422,172
Shares expected to vest	2,600,000
Shares expected to vest, weighted average exercise price	$ 4.43
Shares expected to vest, weighted average life	6 years 10 months 24 days
Shares expected to vest, aggregate intrinsic value	$ 5.4
Stockholders approved shares of restricted stock							3,000,000
Shares vested under terms of related restricted stock agreement	7,034,274					600,000