Consolidated Statements Of Stockholders' Equity (USD $) In Thousands, except Share data	Total	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit
Beginning Balance at Jul. 31, 2011	$ 240,720	$ 2,480	$ 756,046	$ 41	$ (517,847)
Beginning Balance (in shares) at Jul. 31, 2011		49,607,223
Vesting of stock based awards, net of shares withheld for taxes	3,292	24	3,268
Vesting of stock based awards, net of shares withheld for taxes, shares		485,456
Stock option exercises (in shares)	20,046	20,046
Stock option exercises	117	1	116
Repurchases of common stock (in shares)		(1,652,394)
Repurchases of common stock	(9,525)	(82)	(9,443)
Issuance of shares under employees' stock purchase plan (in shares)		146,897
Issuance of shares under employees' stock purchase plan	780	7	773
Unrealized gain on marketable securities	189			189
Net (loss) income	(19,869)				(19,869)
Ending Balance at Jul. 31, 2012	215,704	2,430	750,760	230	(537,716)
Ending Balance (in shares) at Jul. 31, 2012		48,607,228
Vesting of stock based awards, net of shares withheld for taxes	3,605	28	3,577
Vesting of stock based awards, net of shares withheld for taxes, shares		555,433
Stock option exercises (in shares)	2,449	2,449
Stock option exercises	13		13
Repurchases of common stock (in shares)		(1,642,272)
Repurchases of common stock	(9,208)	(82)	(9,126)
Issuance of shares under employees' stock purchase plan (in shares)		165,572
Issuance of shares under employees' stock purchase plan	804	8	796
Unrealized gain on marketable securities	(294)			(294)
Net (loss) income	(12,127)				(12,127)
Ending Balance at Jul. 31, 2013	198,497	2,384	746,020	(64)	(549,843)
Ending Balance (in shares) at Jul. 31, 2013		47,688,410
Vesting of stock based awards, net of shares withheld for taxes	4,258	29	4,229
Vesting of stock based awards, net of shares withheld for taxes, shares		577,164
Stock option exercises (in shares)	69,641	68,688
Stock option exercises	401	3	398
Issuance of shares under employees' stock purchase plan (in shares)		114,346
Issuance of shares under employees' stock purchase plan	870	6	864
Unrealized gain on marketable securities	63			63
Change in pension liability	(15)			(15)
Accumulated currency translation adjustment	(288)			(288)
Net (loss) income	833				833
Ending Balance at Jul. 31, 2014	$ 204,619	$ 2,422	$ 751,511	$ (304)	$ (549,010)
Ending Balance (in shares) at Jul. 31, 2014		48,448,608