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Goodwill (Details) (USD $)
3 Months Ended 6 Months Ended 3 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended 3 Months Ended
Oct. 31, 2013
operating_segment
Oct. 31, 2012
operating_segment
Jan. 31, 2013
Jul. 31, 2013
operating_segment
Oct. 31, 2013
Telecommunications Transmission Segment
Oct. 31, 2012
Telecommunications Transmission Segment
Jul. 31, 2013
Telecommunications Transmission Segment
Oct. 31, 2013
RF Microwave Amplifiers Segment
Oct. 31, 2012
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
Oct. 31, 2013
Mobile Data Communications Segment
Oct. 31, 2012
Mobile Data Communications Segment
Jul. 31, 2013
Mobile Data Communications Segment
Goodwill [Line Items]                                  
Number of reportable operating segments 3 3   3                          
Goodwill, Impaired, Accumulated Impairment Loss [Abstract]                                  
Goodwill gross $ 150,603,000     $ 150,603,000 $ 107,779,000   $ 107,779,000 $ 29,575,000     $ 29,575,000       $ 13,249,000   $ 13,249,000
Goodwill accumulated impairment (13,249,000)     (13,249,000) 0   0 0     0       (13,249,000)   (13,249,000)
Goodwill 137,354,000     137,354,000 107,779,000   107,779,000 29,575,000     29,575,000       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% 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 83,368,000 90,953,000     54,365,000 53,327,000   20,197,000 25,289,000       102,497,000 86,939,000 8,806,000 12,337,000  
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               $ 43,387,000