Schedule of Segment Information (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
Segment Reporting Information [Line Items]
Net sales	$ 92,284us-gaap_Revenues	$ 68,356us-gaap_Revenues	$ 219,446us-gaap_Revenues	$ 101,123us-gaap_Revenues
Income (loss) from operations	1,434us-gaap_OperatingIncomeLoss	(9,486)us-gaap_OperatingIncomeLoss	14,738us-gaap_OperatingIncomeLoss	(16,351)us-gaap_OperatingIncomeLoss
Depreciation and amortization expense	2,315	2,142	4,791	3,765
Semiconductor Test Solutions
Segment Reporting Information [Line Items]
Net sales	70,872	52,950	174,983	85,717
Income (loss) from operations	(807)	(11,404)	10,853	(18,269)
Depreciation and amortization expense	1,793	2,142	4,015	3,765
Electronic Manufacturing Solutions
Segment Reporting Information [Line Items]
Net sales	21,412	15,406	44,463	15,406
Income (loss) from operations	2,241	1,918	3,885	1,918
Depreciation and amortization expense	$ 522		$ 776

The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

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- Definition

The net result for the period of deducting operating expenses from operating revenues.

+ References

No definition available.

+ Details

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- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

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- Details

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