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Benefit Plans (Tables)
 12 Months Ended
Mar. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of weighted-average assumptions
The following is a summary of the Company’s weighted-average assumptions used to estimate the weighted-average per share fair value of options granted on the date of grant using the Black-Scholes option-pricing model:

 
2013
 
2012
 
2011
Dividend yield
0
%
 
0
%
 
0
%
Expected volatility
56.15
%
 
56.85
%
 
57.41
%
Average risk-free interest rate
0.80
%
 
1.12
%
 
1.55
%
Expected life
5.6 years

 
6.0 years

 
6.4 years

Vesting period
5.0 years

 
5.0 years

 
5.0 years

The following is a summary of the Company’s weighted-average assumptions used to estimate the weighted-average per share fair value of options granted on the date of grant using the Black-Scholes option-pricing model:

 
2013
 
2012
 
2011
Dividend yield
0
%
 
0
%
 
0
%
Expected volatility
56.15
%
 
56.85
%
 
57.41
%
Average risk-free interest rate
0.80
%
 
1.12
%
 
1.55
%
Expected life
5.6 years

 
6.0 years

 
6.4 years

Vesting period
5.0 years

 
5.0 years

 
5.0 years
Summary schedule of stock option activity
Option activity for the year ended March 31, 2013 was as follows:

 
Shares
 
Weighted
Average
Exercise
Price
 
Weighted
Average
Remaining
Contractual Term
 
Aggregate
Intrinsic
Value
Options outstanding, beginning of year
1,041,500

 
$
37.95

 
 
 
 
Granted
559,000

 
71.43

 
 
 
 
Exercised
(332,665
)
 
29.89

 
 
 
 
Forfeited
(17,950
)
 
49.64

 
 
 
 
Expired
(300
)
 
43.04

 
 
 
 
Options outstanding, end of period
1,249,585

 
$
54.90

 
7.98
 
$
38,696,623

Options exercisable, end of period
205,305

 
$
33.00

 
4.50
 
$
10,855,260
Intrinsic value of options exercised
The total intrinsic value of options exercised during the periods ended March 31, 2013, 2012 and 2011 were as follows:
2013
 
2012
 
2011
$
14,049,751

 
$
12,049,546

 
$
11,151,259
Schedule of stock option plans, by exercise price range

The following table summarizes information regarding stock options outstanding at March 31, 2013:

Range of
Exercise Price
 
Options
Outstanding
 
Weighted
Average
Remaining
Contractual
Life
 
Weighted
Average
Exercise
Price
 
Options
Exercisable
 
Weighted
Average
Exercise
Price
15.00 - $16.99
 
92,550

 
4.64
 
$
16.57

 
39,350

 
$
16.18

23.00 - $23.99
 
5,500

 
1.58
 
23.53

 
5,500

 
23.53

25.00 - $25.99
 
45,400

 
2.63
 
25.11

 
45,400

 
25.11

26.00 - $27.99
 
125,550

 
6.61
 
26.73

 
18,550

 
26.73

28.00 - $28.99
 
38,250

 
3.30
 
28.25

 
38,250

 
28.25

43.00 - $43.99
 
173,015

 
7.61
 
43.04

 
16,295

 
43.04

48.00 - $49.99
 
13,400

 
3.58
 
49.00

 
13,400

 
49.00

66.00 - $67.99
 
409,920

 
9.13
 
67.40

 
28,560

 
67.70

72.00 - $73.99
 
10,000

 
9.70
 
73.41

 
—

 
—

74.00 - $75.99
 
333,000

 
9.69
 
74.08

 
—

 
—

76.00 - $77.99
 
3,000

 
9.86
 
77.31

 
—

 
—

15.00 - $77.99
 
1,249,585

 
7.98
 
$
54.90

 
205,305

 
$
33.00
Shares vesting based on the compounded annual EPS growth
The 85,000 shares will vest as follows, if the Company achieves the following performance goals during any successive trailing four quarters during the measurement period beginning on October 1, 2012 and ending March 31, 2017:
Trailing 4 quarter EPS Target
 
Restricted Shares Eligible for Vesting (Percentage of Award)
$13.00
 
25%
$14.50
 
25%
$16.00
 
25%
$18.00
 
25%
The 15,871 shares vested on April 30, 2013 based on the Company’s compounded annual EPS growth according to the following schedule:

Vesting Percentage
 
Compounded Annual EPS Growth
100%
 
15% or higher
67%
 
12% - 14.99%
33%
 
10% - 11.99%
0%
 
Below 10%
The 11,139 shares will vest on April 30, 2014 based on the Company’s compounded annual EPS growth according to the following schedule:

Vesting Percentage
 
Compounded Annual EPS Growth
100%
 
15% or higher
67%
 
12% - 14.99%
33%
 
10% - 11.99%
0%
 
Below 10%
The 358,700 shares will vest as follows, if the Company achieves the following performance goals during any successive trailing four quarters during the measurement period beginning on October 1, 2012 and ending March 31, 2017:
Trailing 4 quarter EPS Target
 
Restricted Shares Eligible for Vesting (Percentage of Award)
$13.00
 
25%
$14.50
 
25%
$16.00
 
25%
$18.00
 
25%
The 70,800 shares will vest on April 30, 2015 based on the Company’s achievement of the following performance goals as of March 31, 2015:
EPS Target
 
Restricted Shares Eligible for Vesting (Percentage of Award)
$10.29
 
100%
$9.76
 
67%
$9.26
 
33%
Below $9.26
 
0%
Summary of the status and changes restricted stock
A summary of the status of the Company’s restricted stock as of March 31, 2013, and changes during the year ended March 31, 2013, are presented below:

 
Shares
 
Weighted
Average Fair
Value at
Grant Date
Outstanding at March 31, 2012
93,999

 
$
50.90

Granted during the period
524,500

 
74.45

Vested during the period
(41,285
)
 
46.30

Canceled during the period
(14,758
)
 
41.51

Outstanding at March 31, 2013
562,456

 
$
73.32
Share-based compensation included as a component of net income
Total share-based compensation included as a component of net income during the years ended March 31, 2013, 2012 and 2011 was as follows:

 
2013
 
2012
 
2011
Share-based compensation related to equity classified units:
 
 
 
 
 
Share-based compensation related to stock options
$
7,322,653

 
4,867,231

 
3,855,348

Share-based compensation related to restricted stock
4,818,956

 
2,865,857

 
2,112,721

Total share-based compensation related to equity  classified awards
$
12,141,609

 
7,733,088

 
5,968,069