Net Sales by Geographic Area along with Long-Lived Assets (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2013	Jan. 31, 2012	Jul. 31, 2012
Segment Reporting Information [Line Items]
Net sales	$ 35,016	$ 24,082	$ 78,204	$ 57,834
Long-lived assets	17,744		17,744		18,229
United States
Segment Reporting Information [Line Items]
Net sales	8,638	7,113	15,703	16,519
Long-lived assets	15,859		15,859		16,386
Taiwan
Segment Reporting Information [Line Items]
Net sales	8,128	1,312	20,335	7,766
Philippines
Segment Reporting Information [Line Items]
Net sales	4,232	4,628	11,846	8,656
Long-lived assets	111		111		166
Malaysia
Segment Reporting Information [Line Items]
Net sales	3,873	1,069	8,255	2,806
Hong Kong and China
Segment Reporting Information [Line Items]
Net sales	2,639	2,267	6,287	3,011
Germany
Segment Reporting Information [Line Items]
Net sales	2,418	2,024	3,979	4,920
Singapore
Segment Reporting Information [Line Items]
Net sales	1,128	1,130	3,855	3,549
Long-lived assets	253		253		312
All Other Countries
Segment Reporting Information [Line Items]
Net sales	3,960	4,539	7,944	10,607
Long-lived assets	802		802		801
Japan
Segment Reporting Information [Line Items]
Long-lived assets	$ 719		$ 719		$ 564