Net (Loss) Income Per Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Oct. 31, 2013	Oct. 31, 2012
Net (loss) income	$ (6,900)	$ 549
Basic (loss) earnings per share
Weighted average shares outstanding- basic	47,900	48,303
Basic (loss) earnings per share	$ (0.14)	$ 0.01
Diluted (loss) earnings per share
Weighted average shares outstanding- basic	47,900	48,303
Plus: impact of stock options and unvested restricted stock units		408
Weighted average common and common equivalent shares outstanding- diluted	47,900	48,711
Diluted (loss) earnings per share	$ (0.14)	$ 0.01