Net Sales by Geographic Area along with Long-Lived Assets (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Oct. 31, 2013	Oct. 31, 2012	Jul. 31, 2013
Segment Reporting Information [Line Items]
Net sales	$ 32,767	$ 43,188
Long-lived assets	16,978		16,647
Taiwan
Segment Reporting Information [Line Items]
Net sales	12,623	12,207
United States
Segment Reporting Information [Line Items]
Net sales	4,434	7,065
Long-lived assets	15,248		14,844
Singapore
Segment Reporting Information [Line Items]
Net sales	3,379	2,726
Long-lived assets	294		311
Philippines
Segment Reporting Information [Line Items]
Net sales	3,153	7,614
Long-lived assets	494		517
Malaysia
Segment Reporting Information [Line Items]
Net sales	1,922	4,382
All Other Countries
Segment Reporting Information [Line Items]
Net sales	7,256	9,194
Long-lived assets	666		664
Japan
Segment Reporting Information [Line Items]
Long-lived assets	$ 276		$ 311