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Stock-Based Compensation (Tables)
 6 Months Ended
Sep. 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 and six months ended September 30, 2014 and 2013.

 
Three Months Ended
 
Six Months Ended
 
September 30,
 
September 30,
(In thousands)
2014
 
2013
 
2014
 
2013
Stock-based compensation expense related to:
 
 
 
 
 
 
 
Equity Incentive Plan (a)
$
4,962

 
$
5,179

 
$
18,734

 
$
17,860

Employee Stock Purchase Plan - options to purchase stock
1,041

 
1,058

 
2,099

 
2,105

 
6,003

 
6,237

 
20,833

 
19,965

Tax benefit
(2,041
)
 
(2,134
)
 
(7,550
)
 
(7,428
)
Stock-based compensation expense, net of tax
$
3,962

 
$
4,103

 
$
13,283

 
$
12,537
Summary of Stock Option Activity [Table Text Block]
The following table summarizes the stock option activity during the six months ended September 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
973

 
$
104.79

Exercised
(381
)
 
$
52.10

Forfeited
(37
)
 
$
95.87

Outstanding at September 30, 2014
5,659

 
$
76.93

Vested or expected to vest at September 30, 2014
5,634

 
$
76.82

Exercisable at September 30, 2014
3,453

 
$
63.51
ESPP - Purchase Option Activity [Table Text Block]
The following table summarizes the activity of the ESPP during the six months ended September 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
195

 
$
91.38

Exercised
(103
)
 
$
87.17

Outstanding at September 30, 2014
147

 
$
90.35