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Goodwill (Details) (USD $)	3 Months Ended		6 Months Ended			3 Months Ended		6 Months Ended			3 Months Ended		6 Months Ended		12 Months Ended				3 Months Ended		6 Months Ended
	Jan. 31, 2014 operating_segment	Jan. 31, 2013 operating_segment	Jan. 31, 2014 operating_segment	Jan. 31, 2013 operating_segment	Jul. 31, 2013 operating_segment	Jan. 31, 2014 Telecommunications Transmission Segment	Jan. 31, 2013 Telecommunications Transmission Segment	Jan. 31, 2014 Telecommunications Transmission Segment	Jan. 31, 2013 Telecommunications Transmission Segment	Jul. 31, 2013 Telecommunications Transmission Segment	Jan. 31, 2014 RF Microwave Amplifiers Segment	Jan. 31, 2013 RF Microwave Amplifiers Segment	Jan. 31, 2014 RF Microwave Amplifiers Segment	Jan. 31, 2013 RF Microwave Amplifiers Segment	Jul. 31, 2013 RF Microwave Amplifiers Segment	Jul. 31, 2013 RF Microwave Amplifiers Segment Fiscal 2012 Revenue	Jul. 31, 2012 RF Microwave Amplifiers Segment Fiscal 2012 Revenue	Jul. 31, 2013 RF Microwave Amplifiers Segment Fiscal 2013 Revenue	Jan. 31, 2014 Mobile Data Communications Segment	Jan. 31, 2013 Mobile Data Communications Segment	Jan. 31, 2014 Mobile Data Communications Segment	Jan. 31, 2013 Mobile Data Communications Segment	Jul. 31, 2013 Mobile Data Communications Segment
Goodwill [Line Items]
Number of reportable operating segments	3	3	3	3	3
Goodwill, Impaired, Accumulated Impairment Loss [Abstract]
Goodwill gross	$ 150,603,000		$ 150,603,000		$ 150,603,000	$ 107,779,000		$ 107,779,000		$ 107,779,000	$ 29,575,000		$ 29,575,000		$ 29,575,000				$ 13,249,000		$ 13,249,000		$ 13,249,000
Goodwill accumulated impairment	(13,249,000)		(13,249,000)		(13,249,000)	0		0		0	0		0		0				(13,249,000)		(13,249,000)		(13,249,000)
Goodwill	137,354,000		137,354,000		137,354,000	107,779,000		107,779,000		107,779,000	29,575,000		29,575,000		29,575,000				0		0		0
Step 1 of Goodwill Impairment Test [Abstract]
Estimated fair value of the reporting unit in excess of its carrying value, as a percentage												5.00%		5.00%	13.20%
Date of step one goodwill impairment test			Aug. 01, 2013	Jan. 31, 2013
Fair value inputs, discount rate														12.00%	11.00%
Compounded annual growth rate over a specified period of time																1.00%		4.00%
Net sales	85,499,000	74,577,000	168,867,000	165,530,000		56,521,000	45,769,000	110,886,000	99,096,000		22,041,000	20,362,000	42,238,000	45,651,000			102,497,000	86,939,000	6,937,000	8,446,000	15,743,000	20,783,000
Fair value inputs, long-term revenue growth rate															3.50%
Minimum basis point increase in the WAAC (expressed as a percentage) applied to the reporting unit, that would likely result in step one failure															1.60%
Minimum amount of increase to the reporting unit's carrying value that would likely result in a step one failure															13,200,000
Amount of goodwill and intangible assets assigned to the reporting unit that could be written off in the period that the impairment is triggered											$ 42,750,000		$ 42,750,000

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Amount of goodwill and intangible assets assigned to the reporting unit as of the reporting date that could be written off in the period that the impairment is triggered.

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Represents a minimum amount of increase to the respective reporting unit's carrying value, that would likely result in failure of the first step of the goodwill impairment test, when keeping constant all other variables in calculating the estimated fair value of a reporting unit.

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Represents a minimum basis point increase in the WACC (expressed as a percentage)applied to the reporting unit's carrying value, that would likely result in failure of the first step of the goodwill impairment test, when keeping constant all other variables in calculating the estimated fair value of a reporting unit.

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The chief operating decision-maker manages the enterprise in three reportable operating segments. Each of the three reportable operating segments constitutes a reporting unit for purposes of reviewing goodwill impairment and recoverability.

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Represents the excess of a reporting unit's estimated fair value over the reporting uint's carrying value, as of the date of the first step of the goodwill impairment test, expressed as a percentage.

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Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

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Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.

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The accumulated impairment losses related to goodwill as of the balance sheet date.

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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

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