Segment Information (Tables)

12 Months Ended

Jul. 31, 2013

Segment Reporting [Abstract]

Segment profitability allocation methodology

	Fiscal Year Ended July 31, 2013
	Telecommunications Transmission			RF Microwave Amplifiers		Mobile Data Communications		Unallocated		Total
Net sales	$	194,643,000		86,939,000		38,215,000		—		$	319,797,000
Operating income (loss)	31,686,000			4,104,000		12,288,000		(13,589,000	)	34,489,000
Interest income and other (expense)	(38,000		)	(42,000	)	18,000		1,229,000		1,167,000
Interest expense	352,000			—		(7,000	)	7,818,000		8,163,000
Depreciation and amortization	9,591,000			3,939,000		500,000		3,265,000		17,295,000
Expenditure for long-lived assets, including intangibles	4,179,000			842,000		317,000		9,000		5,347,000
Total assets at July 31, 2013	225,626,000			96,298,000		7,873,000		352,018,000		681,815,000

	Fiscal Year Ended July 31, 2012
	Telecommunications Transmission		RF Microwave Amplifiers		Mobile Data Communications	Unallocated		Total
Net sales	$	210,006,000	102,497,000		112,567,000	—		$	425,070,000
Operating income (loss)	41,709,000		7,622,000		19,924,000	(17,978,000	)	51,277,000
Interest income and other (expense)	42,000		(21,000	)	30,000	1,544,000		1,595,000
Interest expense	651,000		—		—	8,181,000		8,832,000
Depreciation and amortization	10,088,000		4,395,000		2,173,000	3,758,000		20,414,000
Expenditure for long-lived assets, including intangibles	5,490,000		733,000		190,000	—		6,413,000
Total assets at July 31, 2012	244,285,000		98,864,000		11,217,000	365,412,000		719,778,000

	Fiscal Year Ended July 31, 2011
	Telecommunications Transmission		RF Microwave Amplifiers		Mobile Data Communications	Unallocated		Total
Net sales	$	231,957,000	91,973,000		288,449,000	—		$	612,379,000
Operating income (loss)	49,913,000		1,063,000		64,945,000	(8,123,000	)	107,798,000
Interest income and other (expense)	89,000		(8,000	)	43,000	2,297,000		2,421,000
Interest expense	562,000		—		10,000	7,843,000		8,415,000
Depreciation and amortization	11,241,000		4,576,000		6,282,000	5,602,000		27,701,000
Expenditure for long-lived assets, including intangibles	10,607,000		1,069,000		922,000	43,000		12,641,000
Total assets at July 31, 2011	252,839,000		98,261,000		31,265,000	555,144,000		937,509,000