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Segment Information (Details) (USD $)
 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
Segment Reporting Information [Line Items]          
Number of reportable operating segments 3 3 3 3 3
Net sales $ 85,499,000 $ 74,577,000 $ 168,867,000 $ 165,530,000  
Operating income (loss) 11,172,000 5,947,000 21,271,000 19,309,000  
Interest income and other (expense) 228,000 315,000 501,000 591,000  
Interest expense (income) 1,998,000 2,030,000 4,016,000 4,141,000  
Depreciation and amortization 4,324,000 4,382,000 8,563,000 8,734,000  
Expenditure for long-lived assets, including intangibles 2,397,000 1,394,000 3,424,000 2,457,000  
Total assets 655,214,000 684,747,000 655,214,000 684,747,000 681,815,000
Benefit related to a change in fair value of contingent earn-out liability     239,000 3,267,000  
Amortization of stock-based compensation 1,069,000 806,000 2,016,000 1,551,000  
Telecommunications Transmission Segment [Member]
          
Segment Reporting Information [Line Items]          
Net sales 56,521,000 45,769,000 110,886,000 99,096,000  
Operating income (loss) 10,268,000 5,549,000 19,197,000 17,808,000  
Interest income and other (expense) (18,000) (26,000) (12,000) (35,000)  
Interest expense (income) 61,000 80,000 120,000 239,000  
Depreciation and amortization 2,231,000 2,427,000 4,490,000 4,863,000  
Expenditure for long-lived assets, including intangibles 1,981,000 1,228,000 2,914,000 2,069,000  
Total assets 244,478,000 226,656,000 244,478,000 226,656,000  
Benefit related to a change in fair value of contingent earn-out liability 0 889,000 239,000 3,267,000  
RF Microwave Amplifiers Segment [Member]
          
Segment Reporting Information [Line Items]          
Net sales 22,041,000 20,362,000 42,238,000 45,651,000  
Operating income (loss) 1,077,000 645,000 1,668,000 2,363,000  
Interest income and other (expense) (13,000) (7,000) (18,000) (29,000)  
Interest expense (income) 0 0 0 0  
Depreciation and amortization 945,000 977,000 1,888,000 1,957,000  
Expenditure for long-lived assets, including intangibles 163,000 135,000 257,000 342,000  
Total assets 90,733,000 93,208,000 90,733,000 93,208,000  
Mobile Data Communications Segment
          
Segment Reporting Information [Line Items]          
Net sales 6,937,000 8,446,000 15,743,000 20,783,000  
Operating income (loss) 3,273,000 2,994,000 7,379,000 6,465,000  
Interest income and other (expense) 3,000 3,000 6,000 12,000  
Interest expense (income) (3,000) (6,000) (3,000) (6,000)  
Depreciation and amortization 63,000 134,000 137,000 286,000  
Expenditure for long-lived assets, including intangibles 246,000 26,000 246,000 41,000  
Total assets 7,114,000 10,651,000 7,114,000 10,651,000  
Restructuring charge related to the wind-down of microsatellite product line   (253,000)   569,000  
Mobile Data Communications Segment | BFT-1 Sustainment Contract [Member]
          
Segment Reporting Information [Line Items]          
Length of contract     2 years    
Contract value, not to exceed amount     44,279,000    
Performance Period, End Date     Mar. 31, 2014    
Unallocated [Member]
          
Segment Reporting Information [Line Items]          
Net sales 0 0 0 0  
Operating income (loss) (3,446,000) (3,241,000) (6,973,000) (7,327,000)  
Interest income and other (expense) 256,000 345,000 525,000 643,000  
Interest expense (income) 1,940,000 1,956,000 3,899,000 3,908,000  
Depreciation and amortization 1,085,000 844,000 2,048,000 1,628,000  
Expenditure for long-lived assets, including intangibles 7,000 5,000 7,000 5,000  
Total assets 312,889,000 354,232,000 312,889,000 354,232,000  
Amortization of stock-based compensation 1,069,000 806,000 2,016,000 1,551,000  
Telecommunications Transmission Sales to RF Microwave Amplifiers [Member]
          
Segment Reporting Information [Line Items]          
Intersegment sales 464,000 423,000 765,000 1,657,000  
Telecommunications Transmissions Sales to Mobile Data Communications [Member]
          
Segment Reporting Information [Line Items]          
Intersegment sales 134,000 112,000 172,000 2,619,000  
RF Microwave Amplifiers Sales To Telecommunications Transmission [Member]
          
Segment Reporting Information [Line Items]          
Intersegment sales $ 68,000 $ 3,000 $ 134,000 $ 6,000