CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Jul. 31, 2012	Jan. 31, 2012		Oct. 31, 2011		Jul. 31, 2011		Apr. 30, 2011		Jan. 31, 2011		Oct. 31, 2010		Jul. 31, 2010		Apr. 30, 2010		Jan. 31, 2010		Oct. 31, 2009		Jul. 31, 2009
Accounts receivable, trade, net of allowance for doubtful accounts	$ 344	$ 353	[1]	$ 332	[1]	$ 473	[1]	$ 777	[1]	$ 1,027	[1]	$ 994	[1]	$ 919	[1]	$ 879	[1]	$ 1,257	[1]	$ 1,154	[1]	$ 3,767
Preferred stock, par value	$ 0.01	$ 0.01	[1]	$ 0.01	[1]	$ 0.01	[1]	$ 0.01	[1]	$ 0.01	[1]	$ 0.01	[1]	$ 0.01	[1]	$ 0.01	[1]	$ 0.01	[1]	$ 0.01	[1]
Preferred stock, shares authorized	5,000,000	5,000,000	[1]	5,000,000	[1]	5,000,000	[1]	5,000,000	[1]	5,000,000	[1]	5,000,000	[1]	5,000,000	[1]	5,000,000	[1]	5,000,000	[1]	5,000,000	[1]
Preferred stock, shares issued	0	0	[1]	0	[1]	0	[1]	0	[1]	0	[1]	0	[1]	0	[1]	0	[1]	0	[1]	0	[1]
Preferred stock, shares outstanding	0	0	[1]	0	[1]	0	[1]	0	[1]	0	[1]	0	[1]	0	[1]	0	[1]	0	[1]	0	[1]
Common stock, par value	$ 0.01	$ 0.01	[1]	$ 0.01	[1]	$ 0.01	[1]	$ 0.01	[1]	$ 0.01	[1]	$ 0.01	[1]	$ 0.01	[1]	$ 0.01	[1]	$ 0.01	[1]	$ 0.01	[1]
Common stock, shares authorized	1,400,000,000	1,400,000,000	[1]	1,400,000,000	[1]	1,400,000,000	[1]	1,400,000,000	[1]	1,400,000,000	[1]	1,400,000,000	[1]	1,400,000,000	[1]	1,400,000,000	[1]	1,400,000,000	[1]	1,400,000,000	[1]
Common stock, shares issued	43,926,622	44,264,450	[1]	44,076,160	[1]	43,829,097	[1]	43,824,651	[1]	43,814,824	[1]	43,723,322	[1]	44,039,938	[1]	44,056,151	[1]	44,293,804	[1]	44,931,506	[1]
Common stock, shares outstanding	43,926,622	44,264,450	[1]	44,076,160	[1]	43,829,097	[1]	43,824,651	[1]	43,814,824	[1]	43,723,322	[1]	43,729,338	[1]	44,056,151	[1]	44,293,804	[1]	44,931,506	[1]

[1] As Restated