XML 23 R57.htm IDEA: XBRL DOCUMENT v2.4.0.8
Goodwill (Details) (USD $)
3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended 3 Months Ended 9 Months Ended
Apr. 30, 2014
Apr. 30, 2013
Jan. 31, 2013
Apr. 30, 2014
operating_segment
Apr. 30, 2013
operating_segment
Jul. 31, 2013
operating_segment
Apr. 30, 2014
Telecommunications Transmission Segment
Apr. 30, 2013
Telecommunications Transmission Segment
Apr. 30, 2014
Telecommunications Transmission Segment
Apr. 30, 2013
Telecommunications Transmission Segment
Jul. 31, 2013
Telecommunications Transmission Segment
Apr. 30, 2014
RF Microwave Amplifiers Segment
Apr. 30, 2013
RF Microwave Amplifiers Segment
Jan. 31, 2013
RF Microwave Amplifiers Segment
Apr. 30, 2014
RF Microwave Amplifiers Segment
Apr. 30, 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
Apr. 30, 2014
Mobile Data Communications Segment
Apr. 30, 2013
Mobile Data Communications Segment
Apr. 30, 2014
Mobile Data Communications Segment
Apr. 30, 2013
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   $ 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%     13.20%                
Date of step one goodwill impairment test     Jan. 31, 2013 Aug. 01, 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 88,905,000 69,856,000   257,772,000 235,386,000   61,235,000 45,410,000 172,121,000 144,506,000   22,499,000 16,169,000   64,737,000 61,820,000     102,497,000 86,939,000 5,171,000 8,277,000 20,914,000 29,060,000  
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                       $ 42,113,000     $ 42,113,000