Net Income (Loss) Per Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2013	Jan. 31, 2012
Net loss	$ (3,276)	$ (9,688)	$ (2,727)	$ (14,596)
Basic EPS:
Weighted average shares outstanding	47,425	48,961	47,864	49,225
Basic EPS	$ (0.07)	$ (0.20)	$ (0.06)	$ (0.30)
Diluted EPS:
Weighted average shares outstanding	47,425	48,961	47,864	49,225
Plus: impact of stock options and unvested restricted stock units
Weighted average common and common equivalents shares outstanding	47,425	48,961	47,864	49,225
Diluted EPS	$ (0.07)	$ (0.20)	$ (0.06)	$ (0.30)