Net Sales by Geographic Area along with Long-Lived Assets by Location (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jan. 31, 2015	Jan. 31, 2014	Jan. 31, 2015	Jan. 31, 2014	Jul. 31, 2014
Segment Reporting Information [Line Items]
Net sales	$ 92,284	$ 68,356	$ 219,446	$ 101,123
Long-lived assets	40,622		40,622		40,883
US
Segment Reporting Information [Line Items]
Net sales	22,848	17,079	61,905	21,514
Long-lived assets	25,297		25,297		25,300
Malaysia
Segment Reporting Information [Line Items]
Net sales	10,399	3,391	16,649	5,314
Long-lived assets	3,464		3,464		3,598
Germany
Segment Reporting Information [Line Items]
Net sales	6,761	5,166	17,597	6,562
Long-lived assets	9,128		9,128		9,198
China
Segment Reporting Information [Line Items]
Long-lived assets	562		562		711
Japan
Segment Reporting Information [Line Items]
Long-lived assets	680		680		446
Philippines
Segment Reporting Information [Line Items]
Net sales	8,206	2,437	20,686	5,590
Long-lived assets	325		325		391
Singapore
Segment Reporting Information [Line Items]
Net sales	4,856	8,870	11,364	12,249
Long-lived assets	718		718		689
Taiwan
Segment Reporting Information [Line Items]
Net sales	9,389	11,763	23,443	24,386
Long-lived assets					107
All Other Countries
Segment Reporting Information [Line Items]
Net sales	10,961	13,321	27,475	16,436
Long-lived assets	448		448		443
Hong Kong / China
Segment Reporting Information [Line Items]
Net sales	10,190	6,329	22,935	9,072
Thailand
Segment Reporting Information [Line Items]
Net sales	$ 8,674		$ 17,392