Stock-Based Compensation (Tables)

6 Months Ended

Jan. 31, 2012

Stock-Based Compensation [Abstract]

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

	Three months ended January 31,		Six months ended January 31,
	2012	2011	2012	2011
Cost of sales	$     125,000	151,000	178,000	273,000
Selling, general and administrative expenses	795,000	953,000	1,440,000	2,051,000
Research and development expenses	116,000	247,000	291,000	535,000
Stock-based compensation expense before income tax benefit	1,036,000	1,351,000	1,909,000	2,859,000
Income tax benefit	(394,000)	(489,000)	(701,000)	(1,031,000)
Net stock-based compensation expense	$     642,000	862,000	1,208,000	1,828,000

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

	Three months ended January 31,		Six months ended January 31,
	2012	2011	2012	2011
Expected dividend yield	3.68%	-	4.00%	3.66%
Expected volatility	37.70%	-	36.20%	38.00%
Risk-free interest rate	0.42%	-	0.83%	1.27%
Expected life (years)	3.81	-	5.24	5.18

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

	Six months ended January 31,
	2012	2011
Actual income tax benefit recorded for the tax deductions relating to the exercise of stock-based awards	$      235,000	215,000
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	(151,000)	(102,000)
Excess income tax benefit recorded as an increase to additional paid-in capital	84,000	113,000
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	$                82,000	113,000