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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 |

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