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Stock-Based Compensation (Tables)
 3 Months Ended
Jun. 30, 2014
Share-based Compensation, Allocation and Classification in Financial Statements [Abstract]  
Stock-Based Compensation Expense Recognized [Table Text Block]
The following table summarizes stock-based compensation expense recognized by the Company for the three months ended June 30, 2014 and 2013.

 
Three Months Ended
 
June 30,
(In thousands)
2014
 
2013
Stock-based compensation expense related to:
 
 
 
Equity Incentive Plan
$
13,772

 
$
12,681

Employee Stock Purchase Plan - options to purchase stock
1,058

 
1,047

 
14,830

 
13,728

Tax benefit
(5,509
)
 
(5,294
)
Stock-based compensation expense, net of tax
$
9,321

 
$
8,434
Summary of Stock Option Activity [Table Text Block]
The following table summarizes the stock option activity during the three months ended June 30, 2014:

(In thousands, except per share amounts)
Number of Stock Options
 
Weighted-Average
Exercise Price
Outstanding at March 31, 2014
5,104

 
$
69.91

Granted
921

 
$
104.64

Exercised
(275
)
 
$
48.33

Forfeited
(18
)
 
$
91.06

Outstanding at June 30, 2014
5,732

 
$
76.46

Vested or expected to vest at June 30, 2014
5,700

 
$
76.32

Exercisable at June 30, 2014
3,505

 
$
62.84
ESPP - Purchase Option Activity [Table Text Block]
The following table summarizes the activity of the ESPP during the three months ended June 30, 2014:

(In thousands, except per share amounts)
Number of Purchase Options
 
Weighted-Average
Exercise Price
Outstanding at March 31, 2014
55

 
$
80.77

Granted
198

 
$
91.38

Exercised
(55
)
 
$
80.77

Outstanding at June 30, 2014
198

 
$
91.38