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Stock-Based Compensation (Tables)
 9 Months Ended
Dec. 31, 2011
Share-based Compensation, Allocation and Classification in Financial Statements [Abstract]  
Stock-Based Compensation Expense Recognized
The Company recognizes stock-based compensation expense for its stock option plans and Employee Stock Purchase Plan. The following table summarizes stock-based compensation expense recognized by the Company for the three and nine months ended December 31, 2011 and 2010:

 
Three Months Ended
 
Nine Months Ended
 
December 31,
 
December 31,
(In thousands)
2011
 
2010
 
2011
 
2010
Stock-based compensation expense related to:
 
 
 
 
 
 
 
Stock option plans
$
3,311

 
$
3,078

 
$
18,450

 
$
15,998

Employee Stock Purchase Plan - options to purchase stock
971

 
1,188

 
2,902

 
3,537

 
4,282

 
4,266

 
21,352

 
19,535

Tax benefit
(1,410
)
 
(1,449
)
 
(7,370
)
 
(6,746
)
Stock-based compensation expense, net of tax
$
2,872

 
$
2,817

 
$
13,982

 
$
12,789
Summary Of Stock Option Activity
The following table summarizes the stock option activity during the nine months ended December 31, 2011:

 
Number of
Stock Options
(In thousands)
 
Weighted-Average
Exercise Price
Outstanding at March 31, 2011
6,886

 
$
41.11

Granted
994

 
$
66.37

Exercised
(849
)
 
$
27.04

Forfeited
(34
)
 
$
56.79

Outstanding at December 31, 2011
6,997

 
$
46.33

Vested or expected to vest at December 31, 2011
6,976

 
$
46.28

Exercisable at December 31, 2011
4,426

 
$
39.20
ESPP - Purchase Option Activity
The following table summarizes the activity of the ESPP during the nine months ended December 31, 2011:

 
Number of
Purchase Options
(In thousands)
 
Weighted-Average
Exercise Price
Outstanding at March 31, 2011
67

 
$
51.03

Granted
291

 
$
53.97

Exercised
(210
)
 
$
54.20

Outstanding at December 31, 2011
148

 
$
52.31