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Segment Information (Details) (USD $)
 3 Months Ended 9 Months Ended
Apr. 30, 2012
segment
Apr. 30, 2011
Apr. 30, 2012
segment
Apr. 30, 2011
Jul. 31, 2011
segment
Number of reportable operating segments 3   3   3
Net sales $ 99,793,000 $ 131,081,000 $ 312,295,000 $ 472,052,000  
Operating Income (loss) 10,566,000 21,918,000 36,979,000 87,263,000  
Interest income and other (expense) 370,000 557,000 1,300,000 1,877,000  
Interest expense 2,192,000 2,135,000 6,521,000 6,288,000  
Depreciation and amortization 4,873,000 7,023,000 14,974,000 20,393,000  
Expenditure for long-lived assets, including intangibles 1,807,000 1,418,000 4,467,000 10,271,000  
Total assets 746,360,000 979,534,000 746,360,000 979,534,000 937,509,000
Costs related to a contested proxy solicitation     2,638,000    
Merger termination fee, net 0 0 0 12,500,000  
Amortization of stock-based compensation 809,000 1,118,000 2,718,000 3,977,000  
Telecommunications Transmission Segment [Member]
          
Net sales 48,044,000 62,443,000 156,168,000 173,852,000  
Operating Income (loss) 8,463,000 15,447,000 29,816,000 39,217,000  
Interest income and other (expense) 15,000 12,000 35,000 99,000  
Interest expense 163,000 159,000 495,000 399,000  
Depreciation and amortization 2,530,000 2,831,000 7,604,000 8,483,000  
Expenditure for long-lived assets, including intangibles 1,581,000 1,037,000 3,651,000 8,909,000  
Total assets 244,208,000 257,720,000 244,208,000 257,720,000  
RF Microwave Amplifiers Segment [Member]
          
Net sales 28,111,000 23,050,000 71,661,000 69,739,000  
Operating Income (loss) 2,587,000 1,197,000 4,105,000 2,241,000  
Interest income and other (expense) 9,000 (3,000) 3,000 (5,000)  
Interest expense 0 0 0 0  
Depreciation and amortization 1,121,000 1,140,000 3,325,000 3,383,000  
Expenditure for long-lived assets, including intangibles 155,000 241,000 630,000 547,000  
Total assets 102,816,000 102,754,000 102,816,000 102,754,000  
Mobile Data Communications Segment [Member]
          
Net sales 23,638,000 45,588,000 84,466,000 228,461,000  
Operating Income (loss) 2,638,000 9,127,000 16,409,000 48,510,000  
Interest income and other (expense) 7,000 9,000 23,000 33,000  
Interest expense 0 0 0 0  
Depreciation and amortization 366,000 1,874,000 1,183,000 4,357,000  
Expenditure for long-lived assets, including intangibles 71,000 140,000 186,000 768,000  
Total assets 37,203,000 28,587,000 37,203,000 28,587,000  
Unallocated [Member]
          
Net sales 0 0 0 0  
Operating Income (loss) (3,122,000) (3,853,000) (13,351,000) (2,705,000)  
Interest income and other (expense) 339,000 539,000 1,239,000 1,750,000  
Interest expense 2,029,000 1,976,000 6,026,000 5,889,000  
Depreciation and amortization 856,000 1,178,000 2,862,000 4,170,000  
Expenditure for long-lived assets, including intangibles 0 0 0 47,000  
Total assets 362,133,000 590,473,000 362,133,000 590,473,000  
Telecommunications Transmission Sales to RF Microwave Amplifiers [Member]
          
Intersegment sales 1,333,000 729,000 3,032,000 2,591,000  
Telecommunications Transmissions Sales to Mobile Data Communications [Member]
          
Intersegment sales 1,047,000 5,976,000 5,937,000 20,285,000  
RF Microwave Amplifiers Sales to Telecommunications Transmission [Member]
          
Intersegment sales $ 34,000 $ 1,000 $ 119,000 $ 32,000