Schedule of Segment Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended													12 Months Ended
	Jul. 31, 2014	Apr. 30, 2014	Jan. 31, 2014		Oct. 31, 2013	Jul. 31, 2013	Apr. 30, 2013	Jan. 31, 2013	Oct. 31, 2012	Jul. 31, 2012	Apr. 30, 2012	Jan. 31, 2012	Oct. 31, 2011	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2012
Segment Reporting Information [Line Items]
Net sales	$ 124,327	$ 105,424	$ 68,356	[1]	$ 32,767	$ 37,521	$ 36,257	$ 35,016	$ 43,188	$ 43,463	$ 30,837	$ 24,082	$ 33,752	$ 330,874	$ 151,982	$ 132,134
Gross profit	52,903	43,555	26,812	[1]	17,131	19,996	18,699	18,559	23,504	23,767	15,813	10,880	18,037	140,401	80,759	68,497
Operating income (loss)														(5,029)	(12,866)	(21,982)
Depreciation and amortization expense														8,786	8,044	10,917
Semiconductor Test Solutions
Segment Reporting Information [Line Items]
Net sales														272,707	151,982	132,134
Gross profit														122,805	80,759	68,497
Operating income (loss)														(5,618)	(12,866)	(21,982)
Depreciation and amortization expense														7,762	8,044	10,917
Electronic Manufacturing Solutions
Segment Reporting Information [Line Items]
Net sales														58,167
Gross profit														17,596
Operating income (loss)														4,533
Depreciation and amortization expense														1,024
Corporate
Segment Reporting Information [Line Items]
Operating income (loss)														$ (3,944)

[1] The results for the second quarter of 2014, as presented here, reflect the impact of retroactive accounting treatment for $2.6 million of bargain purchase gain, ($1.4) million of which was recorded in the third quarter of 2014 and $4 million of which was recorded in the fourth quarter of 2014.