Stock-Based Compensation Plans (Tables)

6 Months Ended

Sep. 29, 2012

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

The weighted-average fair value per share of stock options granted during the second quarter and the first six months of fiscal 2013 was $6.35 for both periods. The weighted-average fair value per share of stock options granted during the second quarter and the first six months of fiscal 2012 was $8.03 and $7.87, respectively. These fair values per share were estimated at the date of grant using the following weighted-average assumptions:

	Three Months Ended				Six Months Ended
	September 29, 2012		October 1, 2011		September 29, 2012		October 1, 2011
Expected life of options (years)	4.9		5.2		4.9		5.2
Expected stock price volatility	0.29		0.34		0.29		0.31
Risk-free interest rate	0.7	%	1.2	%	0.7	%	1.7	%
Dividend yield	2.6	%	2.3	%	2.6	%	2.3	%

Stock-Based compensation expense

The following table summarizes stock-based compensation expense related to stock awards granted under the Company’s equity incentive plans and rights to acquire stock granted under the Company’s Employee Stock Purchase Plan (ESPP):

	Three Months Ended				Six Months Ended
(In thousands)	September 29, 2012		October 1, 2011		September 29, 2012		October 1, 2011
Stock-based compensation included in:
Cost of revenues	$	1,473	$	1,284	$	3,201	$	2,594
Research and development	9,404		8,103		18,027		14,590
Selling, general and administrative	8,369		7,512		15,626		13,482
	$	19,246	$	16,899	$	36,854	$	30,666

Summary of restricted stock unit activity and related information

The per share weighted-average fair value of RSUs granted during the second quarter of fiscal 2013 was $31.12 ($34.33 for the second quarter of fiscal 2012) and for the first six months of fiscal 2013 was $31.57 ($34.13 for the first six months of fiscal 2012), which were calculated based on estimates at the date of grant using the following weighted-average assumptions:

	Three Months Ended				Six Months Ended
	September 29, 2012		October 1, 2011		September 29, 2012		October 1, 2011
Risk-free interest rate	0.4	%	0.7	%	0.4	%	0.8	%
Dividend yield	2.7	%	2.1	%	2.7	%	2.1	%

Disclosure of Share-based Compensation Arrangements by Share-based Payment Award

The fair values of stock purchase plan rights granted in the second quarter of fiscal 2013 and 2012 were estimated at the date of grant using the following assumptions:

	2013		2012
Expected life of options (years)	1.25		1.25
Expected stock price volatility	0.29		0.29
Risk-free interest rate	0.2	%	0.2	%
Dividend yield	2.7	%	2.4	%

Employee Stock Option [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Summary of option plans activity

A summary of the Company’s option plans activity and related information is as follows:

	Options Outstanding
(Shares in thousands)	Number of Shares		Weighted-Average Exercise Price Per Share
April 2, 2011	24,969		$	29.11
Granted	207		$	34.79
Exercised	(3,622	)	$	24.70
Forfeited/cancelled/expired	(3,766	)	$	37.35
March 31, 2012	17,788		$	28.32
Granted	48		$	33.33
Exercised	(1,205	)	$	24.25
Forfeited/cancelled/expired	(1,366	)	$	39.86
September 29, 2012	15,265		$	27.63
Options exercisable at:
September 29, 2012	13,619		$	27.81
March 31, 2012	15,349		$	28.78

Summary of restricted stock unit activity and related information

A summary of the Company’s RSU activity and related information is as follows:

	RSUs Outstanding
(Shares in thousands)	Number of Shares		Weighted-Average Grant-Date Fair Value Per Share
April 2, 2011	4,215		$	23.19
Granted	2,977		$	33.69
Vested	(1,543	)	$	23.11
Cancelled	(410	)	$	25.18
March 31, 2012	5,239		$	29.01
Granted	2,380		$	31.57
Vested	(1,392	)	$	27.16
Cancelled	(258	)	$	29.51
September 29, 2012	5,969		$	30.25