CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Apr. 30, 2012	Jul. 31, 2011
Accounts receivable, trade, allowance for doubtful accounts	$ 385	$ 473	[1]
Preferred stock, par value	$ 0.01	$ 0.01	[1]
Preferred stock, shares authorized	5,000,000	5,000,000	[1]
Preferred stock, shares issued	0	0	[1]
Preferred stock, shares outstanding	0	0	[1]
Common stock, par value	$ 0.01	$ 0.01	[1]
Common stock, shares authorized	1,400,000,000	1,400,000,000	[1]
Common stock, shares issued	44,255,430	43,829,097	[1]
Common stock, shares outstanding	44,255,430	43,829,097	[1]

[1] As Restated