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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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- Definition 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. + References No definition available. + Details
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- Definition 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. + References No definition available. + Details
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- Definition 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. + References No definition available. + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 68 -Subparagraph l -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph e -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 43 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 72 -Subparagraph d -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph e -Clause 1 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 34 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition 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. + 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=6880815&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 + Details
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