Earnings per Share and Stock-Based Compensation (Details Textual) (USD $) In Millions, except Share data, unless otherwise specified	1 Months Ended	12 Months Ended		9 Months Ended		1 Months Ended	3 Months Ended	9 Months Ended	3 Months Ended		9 Months Ended			3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended			12 Months Ended
	Mar. 31, 2007	Oct. 31, 2011	Jul. 31, 2012	Jul. 31, 2012 Non-Performance Based Options [Member] Y	Jul. 31, 2011 Non-Performance Based Options [Member] Y	Jun. 30, 2011 Performance Options [Member]	Jul. 31, 2011 Performance Options [Member]	Jul. 31, 2012 Performance Options [Member] Y	Jul. 31, 2012 Performance Restricted Stock Units [Member]	Jul. 31, 2011 Performance Restricted Stock Units [Member]	Jul. 31, 2012 Performance Restricted Stock Units [Member] Y	May 31, 2012 Performance Restricted Stock Units [Member]	Jun. 30, 2011 Performance Restricted Stock Units [Member]	Jul. 31, 2012 Stock Options [Member]	Jul. 31, 2011 Stock Options [Member]	Jul. 31, 2012 Stock Options [Member]	Jul. 31, 2011 Stock Options [Member]	Jul. 31, 2012 Warrant [Member]	Jul. 31, 2011 Warrant [Member]	Jul. 31, 2012 Warrant [Member]	Jul. 31, 2011 Warrant [Member]	Jul. 31, 2012 Restricted Stock [Member] Y	Oct. 31, 2010 Restricted Stock [Member]	Mar. 31, 2010 Restricted Stock [Member]
Earnings per share and stock-based compensation (Textual) [Abstract]
Shares outstanding were excluded from the calculation of diluted EPS														11,958,000	10,493,000	3,345,000	5,185,000	18,191,000	10,032,000	11,826,000	15,305,000
Additional shares outstanding were excluded from the calculation of diluted EPS																10,995,000	10,679,000			13,828,000	10,349,000
Percentage of risk-free interest				1.10%	1.90%		3.00%		0.70%	1.70%
Percentage of volatility				76.50%	82.40%		67.30%		91.40%	82.00%
Amount for dividend yield				0.00%	0.00%		0.00%		0.00%	0.00%
Period for expected life				7.1	5.3
Weighted average fair value of options granted				$ 2.58	$ 3.39
Exercise price of performance based options		$ 4.40	$ 4.42					$ 4.65
Fair value of weighted average						$ 3.21
Fair value of weighted average, Nonvested												$ 2.27	$ 3.88
Minimum period for stock issued vested in plan	P3Y
Maximum period for stock issued vested in plan	P5Y
Stockholders approved shares of restricted stock																								3,000,000
Related restricted stock agreement have already vested			7,199,073,000																					2,400,000
Remaining shares to be vested																								600,000
Number of additional shares authorized		10,000,000																					300,000
Total unrecognized compensation expense				$ 3.0				$ 2.0	$ 8.3		$ 8.3											$ 0.7
Unrecognized compensation expense expected to be recognized over weighted average period				1.6				3.1			0.7											1.1