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Stockholders' Equity (Tables)
 12 Months Ended
Mar. 31, 2018
Stockholders' Equity Note [Abstract]  
Schedule of Stock Options, Valuation Assumptions
The following table presents the weighted-average valuation assumptions used for the recognition of stock compensation expense for the LTIP NQSOs granted in each period presented:
 
 
2018 LTIP NQSOs
 
2017 LTIP NQSOs
Expected life (in years)
 
4.90

 
5.94

Expected volatility
 
38.73
%
 
41.80
%
Risk free interest rate
 
1.78
%
 
1.95
%
Dividend yield
 
—
%
 
—
%
Weighted-average exercise price
 
$
69.29

 
$
61.86

Weighted-average option value
 
$
25.03

 
$
26.27
Allocation of Share-based Compensation Costs by Plan
The table below summarizes stock compensation expense by award or option type recognized in the consolidated statements of comprehensive income (loss):
 
Years Ended March 31,
 
2018
 
2017
 
2016
Stock compensation expense recorded for:
 
 
 
 
 
Annual RSUs
$
7,761

 
$
5,191

 
$
2,356

Annual PSUs
1,829

 
1,203

 
3,807

2007 LTIP SARs
—

 
(1,949
)
 
893

LTIP PSUs*
—

 
(296
)
 
(1,511
)
LTIP NQSOs**
3,432

 
694

 
—

Directors' shares
1,134

 
1,168

 
1,077

Employee Stock Purchase Plan***
146

 
164

 
—

Total stock compensation expense
14,302

 
6,175

 
6,622

Income tax benefit recognized
(4,906
)
 
(2,322
)
 
(2,525
)
Net stock compensation expense
$
9,396

 
$
3,853

 
$
4,097


*2007 LTIP PSUs, 2013 LTIP PSUs, 2015 LTIP PSUs, and 2016 LTIP PSUs are collectively referred to herein as LTIP PSUs.

**LTIP NQSOs include 2017 LTIP NQSOs and 2018 LTIP NQSOs.

***The 2015 Employee Stock Purchase Plan authorizes 1,000,000 shares of the Company's common stock for sale to eligible employees using their after-tax payroll deductions. Each consecutive purchase period is six months in duration and shares are purchased on the last trading day of the purchase period at a price that reflects a 15% discount to the closing price on that date. Purchase windows take place in February and August of each fiscal year.
Schedule of Unrecognized Compensation Cost
The table below summarizes the total remaining unrecognized stock compensation expense related to non-vested awards that the Company considers probable to vest and the weighted-average period over which the cost is expected to be recognized as of March 31, 2018:
 
Unrecognized
Stock Compensation
Expense
 
Weighted-Average
Remaining
Vesting Period (Years)
Annual RSUs
$
7,517

 
1.2
Annual PSUs
2,115

 
1.4
LTIP NQSOs
6,057

 
1.5
Total
$
15,689

 
 
Schedule of Nonvested Stock Units Activity
The table below summarizes Annual RSU and Annual PSU activity:
 
Number of
Shares
 
Weighted-
Average
Grant-Date
Fair Value
Nonvested at March 31, 2015
340,000

 
$
70.11

Granted
240,000

 
70.82

Vested
(132,000
)
 
66.74

Forfeited
(91,000
)
 
72.84

Cancelled*
(154,000
)
 
74.22

Nonvested at March 31, 2016
203,000

 
68.80

Granted
268,000

 
59.34

Vested
(111,000
)
 
65.37

Forfeited
(66,000
)
 
70.79

Cancelled*
(68,000
)
 
65.23

Nonvested at March 31, 2017
226,000

 
63.96

Granted
188,000

 
67.92

Vested
(102,000
)
 
67.63

Forfeited
(23,000
)
 
64.59

Nonvested at March 31, 2018
289,000

 
$
65.18


*Shares cancelled represent Annual PSUs granted that did not meet the required performance criteria.


The table below summarizes LTIP PSU activity:
 
Number of
Shares
 
Weighted-
Average
Grant-Date
Fair Value
Nonvested at March 31, 2015
624,000

 
$
68.82

Granted
308,000

 
50.05

Vested
(47,000
)
 
26.73

Forfeited
(232,000
)
 
70.98

Cancelled*
(264,000
)
 
63.22

Nonvested at March 31, 2016
389,000

 
61.53

Granted
7,000

 
56.56

Forfeited
(27,000
)
 
68.63

Cancelled*
(100,000
)
 
89.77

Nonvested at March 31, 2017
269,000

 
50.22

Cancelled*
(269,000
)
 
50.22

Nonvested at March 31, 2018
—

 
$
—


*Shares cancelled represent LTIP PSUs granted that did not meet the required performance criteria.
Schedule of Stock Appreciation Rights Award Activity
The table below summarizes 2007 LTIP SARs activity:
 
2007 LTIP SARs
 
Weighted-
Average
Exercise
Price
 
Weighted-
Average
Remaining
Contractual
Term
(Years)
 
Aggregate
Intrinsic
Value
Outstanding at March 31, 2015
715,000

 
$
26.73

 
5.8
 
$
33,000

Exercised
(80,000
)
 
26.73

 
 
 
 
Forfeited
(15,000
)
 
26.73

 
 
 
 
Outstanding at March 31, 2016
620,000

 
26.73

 
3.5
 
20,600

Exercised
(290,000
)
 
26.73

 
 
 
 
Cancelled*
(90,000
)
 
26.73

 
 
 
 
Outstanding at March 31, 2017
240,000

 
26.73

 
5.1
 
7,920

Exercised
(240,000
)
 
26.73

 
 
 
 
Outstanding and Exercisable at March 31, 2018
—

 
$
—

 
—
 
$
—


*Shares cancelled represent SARs granted that did not meet the required performance criteria.
Share-based Compensation, Stock Options, Activity
The table below summarizes LTIP NQSO activity:
 
Number of
Shares
 
Weighted-
Average
Grant-Date
Fair Value
 
Weighted-
Average
Remaining
Contractual
Term
(Years)
 
Aggregate
Intrinsic
Value
Nonvested at March 31, 2016
—

 
$
—

 
—

 
$
—

Granted
208,000

 
61.86

 
 
 
 
Forfeited
(16,000
)
 
61.86

 
 
 
 
Nonvested at March 31, 2017
192,000

 
61.86

 
9.0
 
—

Granted
205,000

 
69.29

 
 
 
 
Nonvested at March 31, 2018
397,000

 
$
65.70

 
7.1
 
$
9,700
Share Repurchases
The following table summarizes the stock repurchase activity under the above programs:
 
Years Ended March 31,
 
2018
 
2017
 
2016
Average price paid per share
$
87.91

 
$
56.51

 
$
66.32

Total number of shares purchased*
1,702,653

 
222,471

 
1,420,349

Approximate dollar value of shares purchased
$
149,687

 
$
12,572

 
$
94,200


*All shares were repurchased as part of publicly-announced programs in open-market transactions.