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Stock-Based Compensation (Tables)
 6 Months Ended
Sep. 30, 2015
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, 2015 and 2014:
 
Three Months Ended
 
Six Months Ended
 
September 30,
 
September 30,
(In thousands)
2015
 
2014
 
2015
 
2014
Stock-based compensation expense related to:
 
 
 
 
 
 
 
Equity Incentive Plan (a)
$
4,990

 
$
4,962

 
$
17,485

 
$
18,734

Employee Stock Purchase Plan - options to purchase stock
932

 
1,041

 
2,087

 
2,099

 
5,922

 
6,003

 
19,572

 
20,833

Tax benefit
(1,986
)
 
(2,041
)
 
(6,950
)
 
(7,550
)
Stock-based compensation expense, net of tax
$
3,936

 
$
3,962

 
$
12,622

 
$
13,283


___________________
(a)
Stock-based compensation expense related to stock options granted under the Company’s Equity Incentive Plan is highest during the Company’s fiscal first quarter ended June 30th relative to other quarters during the year. This is primarily due to a retirement-eligible vesting provision under the plan and the timing of the majority of the Company’s stock option awards each year during its fiscal first quarter.
Summary of Stock Option Activity [Table Text Block]
The following table summarizes the stock option activity during the six months ended September 30, 2015:
(In thousands, except per share amounts)
Number of Stock Options
 
Weighted-Average
Exercise Price
Outstanding at March 31, 2015
4,974

 
$
79.76

Granted
1,020

 
$
103.57

Exercised
(290
)
 
$
48.74

Forfeited
(82
)
 
$
101.64

Outstanding at September 30, 2015
5,622

 
$
85.36

Vested or expected to vest at September 30, 2015
5,597

 
$
85.28

Exercisable at September 30, 2015
3,453

 
$
74.41
ESPP - Purchase Option Activity [Table Text Block]
The following table summarizes the activity of the ESPP during the six months ended September 30, 2015:
(In thousands, except per share amounts)
Number of Purchase Options
 
Weighted-Average
Exercise Price
Outstanding at March 31, 2015
54

 
$
86.47

Granted
237

 
$
78.07

Exercised
(108
)
 
$
89.33

Outstanding at September 30, 2015
183

 
$
73.93