Stock-Based Compensation (Tables)

12 Months Ended

Mar. 31, 2011

Stock-Based Compensation

Stock-Based Compensation Expense Recognized

(In thousands)	Fiscal Years Ended March 31,
Stock-based compensation expense related to:	2011			2010			2009
Equity Incentive Plan	$	19,122		$	16,455		$	14,863
Employee Stock Purchase Plan—options to purchase stock		4,547			6,413			5,772
		23,669			22,868			20,635
Tax benefit		(8,364	)		(6,913	)		(6,544	)
Stock-based compensation expense, net of tax	$	15,305		$	15,955		$	14,091

Stock Option Grant Assumptions

	Fiscal 2011			Fiscal 2010			Fiscal 2009
Expected volatility		41.9	%		39.5	%		29.6	%
Expected dividend yield		1.42	%		1.75	%		0.90	%
Expected term		5.6 years			5.6 years			5.6 years
Risk-free interest rate		2.1	%		2.3	%		3.2	%

Summary of Stock Option Activity

	Number of Stock Options			Weighted-Average Exercise Price Per Share		Aggregate Intrinsic Value
						(In thousands)
Outstanding at March 31, 2008		6,632,703		$	23.52
Granted		1,120,273		$	59.67
Exercised		(1,027,129	)	$	15.76
Forfeited		(85,478	)	$	31.63
Outstanding at March 31, 2009		6,640,369		$	30.71	$	60,142
Granted		1,425,650		$	43.15
Exercised		(1,299,528	)	$	16.82
Forfeited		(59,473	)	$	18.50
Outstanding at March 31, 2010		6,707,018		$	36.15	$	184,230
Granted		1,047,300		$	62.56
Exercised		(812,304	)	$	27.20
Forfeited		(56,428	)	$	50.38
Outstanding at March 31, 2011		6,885,586		$	41.11	$	174,350
Vested or expected to vest as of
March 31, 2011		6,745,105		$	40.79	$	172,944
Exercisable as of March 31, 2011		4,179,865		$	33.23	$	138,796

ESPP Purchase Option Assumptions

	Fiscal 2011			Fiscal 2010			Fiscal 2009
Expected volatility		41.8	%		72.2	%		61.3	%
Expected dividend yield		1.01	%		1.61	%		1.07	%
Expected term		3 to 9 months			3 to 12 months			3 to 6 months
Risk-free interest rate		0.2	%		0.4	%		1.7	%

ESPP - Purchase Option Activity

	Number of Purchase Options			Weighted-Average Exercise Price Per Share		Aggregate Intrinsic Value
						(In thousands)
Outstanding at March 31, 2008		108,634		$	36.21
Granted		463,443		$	35.52
Exercised		(439,325	)	$	37.57
Outstanding at March 31, 2009		132,752		$	29.30	$	599
Granted		512,327		$	29.29
Exercised		(523,507	)	$	29.47
Outstanding at March 31, 2010		121,572		$	28.53	$	4,266
Granted		283,293		$	52.73
Exercised		(338,037	)	$	44.37
Outstanding at March 31, 2011		66,828		$	51.03	$	1,028