Employee Stock and Savings Plans (Tables)

12 Months Ended

Jan. 31, 2015

Share-based Compensation Arrangement by Share-based Payment Award

Schedule of restricted stock units award activity

The following table summarizes restricted stock activity (including the target number of shares awarded under performance-based restricted stock units):

	Restricted Stock Units		Weighted Average Grant Date Fair Value		Weighted Average Remaining Contractual  Term (Years)	Aggregate Intrinsic Value
Nonvested as of January 31, 2014	4,083		$	17.07
Granted	1,823		$	21.52
Vested	(1,548	)	$	14.79
Forfeited	(112	)	$	17.39
Nonvested as of January 31, 2015	4,246		$	19.63	1.61	$	97,699

Schedule of fair value of stock awards vested

The following table summarizes the fair value of restricted stock units vested:

Year ended January 31,	2015		2014		2013
Total fair value of restricted stock units vested	$	22,874	$	17,736	$	11,698

Schedule of stock options activity

Stock options outstanding, the weighted average exercise price, and transactions involving stock options are summarized as follows:

	Options Outstanding		Weighted Average Exercise Price		Weighted Average Remaining Contractual Terms (Years)	Aggregate Intrinsic Value
Balance as of January 31, 2014	3,587		$	9.87
Granted	—		$	—
Exercised	(426	)	$	10.89
Forfeited	—		$	—
Expired	(9	)	$	10.00
Balance as of January 31, 2015	3,152		$	9.73	4.67	$	41,849
Options exercisable as of January 31, 2015	2,844		$	9.14	4.38	$	39,454
Options vested as of January 31, 2015 and options expected to vest after January 31, 2015	3,152		$	9.73	4.67	$	41,849

Proceeds from and intrinsic value of options exercised

The total intrinsic value of options exercised and cash received from options exercised was as follows:

Year ended January 31,	2015		2014		2013
Intrinsic value	$	4,601	$	26,769	$	21,647
Cash received	$	4,636	$	38,830	$	24,262

Schedule of shares issued under employee stock purchase plan and other associated information

The following table summarizes shares issued under the ESPPs and other associated information:

Year ended January 31,	2015		2014		2013
Shares issued under the ESPPs	1,389		1,554		1,884
Cash received for the purchase of shares under the ESPPs	$	25,642	$	23,895	$	22,645
Weighted average purchase price per share	$	18.47	$	15.38	$	12.02

Summary of the weighted average grant date fair value

The weighted average grant date fair values are summarized as follows:

Year ended January 31,	2015		2014		2013
Restricted stock units granted	$	21.52	$	22.42	$	16.74
ESPP purchase rights	$	4.81	$	4.30	$	3.82
Options granted	$	—	$	—	$	7.18

Schedule of employee stock purchase plan valuation assumptions

Year ended January 31,	2015		2014		2013
Employee Stock Purchase Plans
Risk-free interest rate	0.05% - 0.09%		0.09% - 0.14%		0.05% - 0.15%
Dividend yield (range)	0.8% - 0.9%		0.0% - 1.0%		0	%
Dividend yield (weighted average)	0.8	%	0.5	%	0	%
Expected life (in years)	0.5		0.5		0.5
Volatility (range)	22% - 23%		22% - 33%		33% - 43%
Volatility (weighted average)	22	%	29	%	39	%

Schedule of stock options valuation assumptions

Year ended January 31,	2013
Stock Option Plans
Risk-free interest rate	0.9% - 1.3%
Dividend yield	0	%
Expected life (in years)	5.8 - 6.3
Volatility (range)	43% - 53%
Volatility (weighted average)	43	%

Schedule of employee service share-based compensation, allocation of recognized period costs

The following table summarizes stock-based compensation expense included in the results of operations and the tax benefit associated with the exercise of stock options:

Year ended January 31,	2015		2014		2013
Cost of revenues:
Service and support	$	2,304	$	1,992	$	1,529
Operating expense:
Research and development	14,027		11,182		9,206
Marketing and selling	9,103		7,777		6,654
General and administration	10,373		8,399		6,308
Equity plan-related compensation expense	$	35,807	$	29,350	$	23,697
Tax effect of the exercise of stock options	$	280	$	386	$	266