Stock-Based Compensation (Tables)

9 Months Ended

Apr. 30, 2012

Stock-Based Compensation [Abstract]

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

	Three months ended April 30,		Nine months ended April 30,
	2012	2011	2012	2011
Cost of sales	$       46,000	88,000	224,000	361,000
Selling, general and administrative expenses	626,000	824,000	2,066,000	2,875,000
Research and development expenses	137,000	206,000	428,000	741,000
Stock-based compensation expense before income tax benefit	809,000	1,118,000	2,718,000	3,977,000
Income tax benefit	(308,000)	(399,000)	(1,009,000)	(1,430,000)
Net stock-based compensation expense	$     501,000	719,000	1,709,000	2,547,000

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

	Three months ended April 30,		Nine months ended April 30,
	2012	2011	2012	2011
Expected dividend yield	3.49%	3.59%	3.97%	3.59%
Expected volatility	36.00%	38.00%	36.19%	38.00%
Risk-free interest rate	0.85%	2.30%	0.83%	2.24%
Expected life (years)	5.19	5.28	5.23	5.27

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

	Nine months ended April 30,
	2012	2011
Actual income tax benefit recorded for the tax deductions relating to the exercise of stock-based awards	$         341,000	291,000
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 of $192,000 and $0 during the nine months ended April 30, 2012 and 2011, respectively	(197,000)	(137,000)
Excess income tax benefit recorded as an increase to additional paid-in capital	144,000	154,000
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	(2,000)	-
Excess income tax benefit from exercised equity-classified stock-based awards reported as a cash flow from financing activities in our Condensed Consolidated Statements of Cash Flows	$            142,000	154,000