Summary of Significant Accounting and Reporting Policies (Tables)

12 Months Ended

Jul. 31, 2011

Summary of Significant Accounting and Reporting Policies [Abstract]

Schedule of Combined Sales by MTS and BFT-1

	Net Sales	Percentage of Mobile Data Communications Segment Net Sales	Percentage of Consolidated  Net Sales
2011	$     248,578,000	86.2%	40.6%
2010	423,213,000	94.8%	54.4%
2009	156,385,000	88.4%	26.7%

Schedule of numerators and denominators used in basic and diluted EPS calculations

	Fiscal Years Ended July 31,
	2011	2010	2009
Numerator:
Net income for basic calculation	$  67,895,000	60,630,000	47,525,000
Effect of dilutive securities:
Interest expense (net of tax) on 3.0% convertible senior notes	4,468,000	4,468,000	1,030,000
Interest expense (net of tax) on 2.0% convertible senior notes	-	-	2,866,000
Numerator for diluted calculation	$  72,363,000	65,098,000	51,421,000
Denominator:
Denominator for basic calculation	26,842,000	28,270,000	26,321,000
Effect of dilutive securities:
Stock options	215,000	316,000	448,000
Conversion of 3.0% convertible        senior notes	5,566,000	5,488,000	1,268,000
Conversion of 2.0% convertible        senior notes	-	-	1,756,000
Denominator for diluted calculation	32,623,000	34,074,000	29,793,000

Stock-based compensation for awards detailing where recorded in Statement of Operations

	Fiscal Years Ended July 31,
	2011	2010	2009
Cost of sales	$       410,000	828,000	812,000
Selling, general and administrative expenses	3,976,000	6,317,000	7,080,000
Research and development expenses	971,000	1,571,000	1,684,000
Stock-based compensation expense before     income tax benefit	5,357,000	8,716,000	9,576,000
Income tax benefit	(1,913,000)	(3,201,000)	(3,201,000)
Net stock-based compensation expense	$    3,444,000	5,515,000	6,375,000

Certain weighted average assumptions used to estimate initial fair value of stock-based awards

	Fiscal Years Ended July 31,
	2011	2010	2009
Expected dividend yield	3.62%	0%	0%
Expected volatility	36.31%	38.00%	40.36%
Risk-free interest rate	1.58%	1.99%	2.19%
Expected life (years)	5.10	5.01	3.61

Actual income tax benefit recognized for tax deductions relating to the exercise of stock-based awards

	Fiscal Years Ended July 31,
	2011	2010	2009
Actual income tax benefit recorded for the tax deductions relating to the exercise of stock-based awards	$      306,000	484,000	3,805,000
Less: Tax benefit initially recognized on exercised stock-based awards vesting subsequent to the adoption of accounting standards that require us to expense stock-based awards, excluding income tax shortfalls	(81,000)	(227,000)	(1,275,000)
Excess income tax benefit recorded as an increase to additional paid-in capital	225,000	257,000	2,530,000
Less: Tax benefit initially disclosed but not previously recognized on exercised equity-classified stock-based awards vesting prior to the adoption of accounting standards that require us to expense stock-based awards	-	(7,000)	-
Excess income tax benefit from exercised equity-classified stock-based awards reported as a cash flow from financing activities in our Consolidated Statements of Cash Flows	$      225,000	250,000	2,530,000