Employee Stock and Savings Plans

6 Months Ended

Jul. 31, 2015

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Employee Stock and Savings Plans

Stock-Based Compensation

Stock Option and Stock Plans

Our 2010 Omnibus Incentive Plan (Incentive Plan) is administered by the Compensation Committee of our Board of Directors and permits accelerated vesting of outstanding options, restricted stock units, restricted stock awards, and other equity incentives upon the occurrence of certain changes in control of our company. Stock options and time-based restricted stock units under the Incentive Plan are generally expected to vest over four years. Stock options have an expiration date of ten years from the date of grant and an exercise price no less than the fair market value of the shares on the date of grant. Performance-based restricted stock units vest after three years depending on attainment of goals for operating income margin.

Employee Stock Purchase Plans

We have an employee stock purchase plan (ESPP) for U.S. employees and an ESPP for certain foreign subsidiary employees. The ESPPs provide for six-month offerings commencing on January 1 and July 1 of each year with purchases on June 30 and December 31 of each year. Each eligible employee may purchase up to six thousand shares of stock on each purchase date (subject to a plan limit on the total fair market value) at prices no less than 85% of the lesser of the fair market value of the shares on the offering date or on the purchase date.

Stock-Based Compensation Expense

The following table summarizes stock-based compensation expense recognized:

	Three months ended July 31,				Six months ended July 31,
	2015		2014		2015		2014
Cost of revenues	$	608	$	544	$	1,316	$	1,079
Operating expenses:
Research and development	3,800		3,311		8,118		6,552
Marketing and selling	2,366		2,143		4,846		4,321
General and administration	3,812		3,162		6,584		5,337
Equity plan-related compensation expense	$	10,586	$	9,160	$	20,864	$	17,289