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Employee Benefit Plans (Tables)
12 Months Ended
Mar. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of share-based compensation expense and related tax benefit recognized
The following table summarizes share-based compensation expense and total income tax provision (benefit) recognized for fiscal years 2018, 2017 and 2016 (in thousands):
 
 
Years Ended March 31,
 
 
2018
 
2017
 
2016
Cost of goods sold
 
$
3,733

 
$
2,663

 
$
2,340

Marketing and selling
 
17,765

 
14,723

 
9,273

Research and development
 
6,381

 
4,200

 
3,046

General and administrative
 
16,259

 
14,304

 
12,353

Restructuring
 

 

 
7

Total share-based compensation expense
 
44,138

 
35,890

 
27,019

Income tax benefit
 
(15,998
)
 
(8,536
)
 
(6,297
)
Total share-based compensation expense, net of income tax benefit
 
$
28,140

 
$
27,354

 
$
20,722

Summary of unamortized share-based compensation expense and the remaining months over which such expense is expected to be recognized
The following table summarizes total unamortized share-based compensation expense and the remaining months over which such expense is expected to be recognized, on a weighted-average basis by type of grant (in thousands, except number of months):
 
 
March 31, 2018
 
 
Unamortized
Expense
 
Remaining
Months
ESPP
 
$
1,337

 
4
Time-based RSUs
 
56,723

 
21
Market-based and performance-based RSUs
 
13,620

 
23
 
 
$
71,680

 
 
Schedule of assumptions applied for the fair value of market-based RSUs using the Monte-Carlo simulation method
The grant date fair value of the awards using the Black-Scholes-Merton option-pricing valuation model and Monte-Carlo simulation method are determined with the following assumptions and values:
 Employee Stock Purchase Plans
 
Years Ended March 31,
 
 
2018
 
2017
 
2016
Dividend yield
 
1.67
%
 
2.50
%
 
3.47
%
Risk-free interest rate
 
1.37
%
 
0.51
%
 
0.29
%
Expected volatility
 
27
%
 
35
%
 
26
%
Expected life (years)
 
0.5

 
0.5

 
0.5

Weighted average grant date fair value per share
 
$
8.69

 
$
5.73

 
$
3.29

RSUs with Market Conditions
 
Years Ended March 31,
 
 
2018
 
2017
 
2016
Dividend yield
 
1.75
%
 
3.29
%
 
3.78
%
Risk-free interest rate
 
1.40
%
 
0.86
%
 
0.84
%
Expected volatility
 
31
%
 
34
%
 
38
%
Expected life (years)
 
3.0

 
3.0

 
3.0

Summary of stock option activity
A summary of the Company's stock option activities under all stock plans for fiscal years 2018, 2017 and 2016 is as follows (including discontinued operations for fiscal year 2016):
 
 
Number of Shares
 
Weighted-Average Exercise Price
 
Weighted-Average Remaining Contractual Term

 
Aggregate Intrinsic Value
 
 
(In thousands)
 
 
 
(Years)
 
(In thousands)
Outstanding, March 31, 2015
 
7,876

 


 
 
 
 
Granted
 

 


 
 
 
 
Exercised
 
(746
)
 


 
 
 
$
4,026

Canceled or expired
 
(1,796
)
 


 
 
 
 
Outstanding, March 31, 2016
 
5,334

 


 
 
 
 
Granted
 

 


 
 
 
 
Exercised
 
(1,784
)
 


 
 
 
$
14,627

Canceled or expired
 
(500
)
 


 
 
 
 
Outstanding, March 31, 2017
 
3,050

 
$
18

 

 


Granted
 

 

 

 


Exercised
 
(994
)
 
$
28

 

 
$
8,347

Canceled or expired
 
(16
)
 
$
35

 

 


Outstanding, March 31, 2018
 
2,040

 
$
14

 
4.0
 
$
46,630

Vested and exercisable, March 31, 2018
 
2,040

 
$
14

 
4.0
 
$
46,630

Summary of time- and performance-based RSU activity
A summary of the Company's time-based, market-based, and performance-based RSU activities for fiscal years 2018, 2017 and 2016 is as follows (including discontinued operations for all the periods presented):
 
 
Number of Shares
 
Weighted-Average Grant Date Fair Value
 
Weighted-Average Remaining Vesting Period
 
Aggregate
Fair Value
 
 
(In thousands)
 
 
 
(Years)
 
(In thousands)
Outstanding, March 31, 2015
 
4,939

 


 
 
 
 
Granted—time-based
 
2,247

 
$
13

 
 
 
 
Granted—market-based
 
356

 
$
14

 
 
 
 
Granted - performance-based
 
356

 
$
13

 
 
 
 
Vested
 
(1,557
)
 


 
 
 
$
22,823

Canceled or expired
 
(820
)
 


 
 
 
 
Outstanding, March 31, 2016
 
5,521

 


 
 
 
 
Granted—time-based
 
2,390

 
$
16

 
 
 
 
Granted—market-based
 
160

 
$
15

 
 
 
 
Granted - performance-based
 
604

 
$
15

 
 
 
 
Vested
 
(2,126
)
 


 
 
 
$
48,644

Canceled or expired
 
(368
)
 


 
 
 
 
Outstanding, March 31, 2017
 
6,181

 
$
14

 
 
 
 
Granted—time-based
 
1,212

 
$
33

 
 
 
 
Granted—market and performance based
 
409

 
$
33

 
 
 
 
Vested
 
(2,248
)
 
$
14

 
 
 
$
81,582

Canceled or expired
 
(333
)
 
$
17

 
 
 
 
Outstanding, March 31, 2018
 
5,221

 
$
20

 
1.4
 
$
191,777

Schedule of net periodic benefit costs
The net periodic benefit cost of the defined benefit pension plans and the non-retirement post-employment benefit obligations for fiscal years 2018, 2017 and 2016 was as follows (in thousands):
 
 
Years Ended March 31,
 
 
2018
 
2017
 
2016
Service costs
 
$
9,715

 
$
10,385

 
$
10,117

Interest costs
 
1,126

 
800

 
1,147

Expected return on plan assets
 
(1,792
)
 
(1,724
)
 
(1,657
)
Amortization:
 
 
 
 
 
 
    Net transition obligation
 

 
4

 
4

Net prior service credit recognized
 
(51
)
 
(117
)
 
(124
)
Net actuarial loss recognized
 
242

 
1,032

 
1,854

 
 
$
9,240

 
$
10,380

 
$
11,341

Schedule of changes in projected benefit obligations
The changes in projected benefit obligations for fiscal years 2018 and 2017 were as follows (in thousands):
 
 
Years Ended March 31,
 
 
2018
 
2017
Projected benefit obligations, beginning of the year
 
$
114,640

 
$
120,473

Service costs
 
9,715

 
10,385

Interest costs
 
1,126

 
800

Plan participant contributions
 
3,522

 
3,020

Actuarial gains
 
(1,580
)
 
(11,081
)
Benefits paid
 
(1,202
)
 
(5,214
)
Plan amendment related to statutory change
 
(2,519
)
 
65

Administrative expense paid
 
(144
)
 
(132
)
Currency exchange rate changes
 
5,357

 
(3,676
)
Projected benefit obligations, end of the year
 
$
128,915

 
$
114,640

Schedule of changes in the fair value of defined benefit pension plan assets
The following table presents the changes in the fair value of defined benefit pension plan assets for fiscal years 2018 and 2017 (in thousands):
 
 
Years Ended March 31,
 
 
2018
 
2017
Fair value of plan assets, beginning of the year
 
$
71,376

 
$
65,279

Actual return on plan assets
 
1,824

 
4,733

Employer contributions
 
5,995

 
5,865

Plan participant contributions
 
3,522

 
3,020

Benefits paid
 
(1,202
)
 
(5,214
)
Administrative expenses paid
 
(144
)
 
(132
)
Currency exchange rate changes
 
3,347

 
(2,175
)
Fair value of plan assets, end of the year
 
$
84,718

 
$
71,376

Schedule of fair value of the defined benefit pension plan assets by major categories and by levels within the fair value hierarchy
The following tables present the fair value of the defined benefit pension plan assets by major categories and by levels within the fair value hierarchy as of March 31, 2018 and 2017 (in thousands):
 
 
March 31,
 
 
2018
 
2017
 
 
Level 1
 
Level 2
 
Total
 
Level 1
 
Level 2
 
Total
Cash and cash equivalents
 
$
18,331

 
$
24

 
$
18,355

 
$
11,864

 
$
46

 
$
11,910

Equity securities
 
26,204

 

 
26,204

 
20,985

 

 
20,985

Debt securities
 
25,150

 

 
25,150

 
22,373

 

 
22,373

Swiss real estate funds
 
12,096

 

 
12,096

 
9,699

 

 
9,699

Hedge funds
 

 

 

 

 
3,507

 
3,507

Insurance contracts
 

 
32

 
32

 

 
61

 
61

Other
 
2,623

 
258

 
2,881

 
2,654

 
187

 
2,841

 
 
$
84,404

 
$
314

 
$
84,718

 
$
67,575

 
$
3,801

 
$
71,376

Schedule of net funded status
The funded status of the plans was as follows (in thousands):
 
 
Years Ended March 31,
 
 
2018
 
2017
Fair value of plan assets
 
$
84,718

 
$
71,376

Less: projected benefit obligations
 
128,915

 
114,640

Underfunded status 
 
$
(44,197
)
 
$
(43,264
)
Schedule of amounts recognized on the balance sheet for the plans
Amounts recognized on the balance sheet for the plans were as follows (in thousands):
 
 
March 31,
 
 
2018
 
2017
Current liabilities
 
$
(1,763
)
 
$
(1,266
)
Non-current liabilities
 
(42,434
)
 
(41,998
)
Net liabilities
 
$
(44,197
)
 
$
(43,264
)
Schedule of amounts recognized in other comprehensive income (loss)
Amounts recognized in accumulated other comprehensive loss related to defined benefit pension plans were as follows (in thousands):
 
 
March 31,
 
 
2018
 
2017
 
2016
Net prior service credits
 
$
3,843

 
$
1,274

 
$
1,613

Net actuarial loss
 
(9,821
)
 
(11,407
)
 
(27,612
)
Net transition obligation
 

 

 
(4
)
Accumulated other comprehensive loss
 
(5,978
)
 
(10,133
)
 
(26,003
)
Deferred tax benefit
 
(420
)
 
(347
)
 
(168
)
Accumulated other comprehensive loss, net of tax
 
$
(6,398
)
 
$
(10,480
)
 
$
(26,171
)
Schedule of amounts in accumulated other comprehensive income (loss) to be recognized over next fiscal year
The following table presents the amounts included in accumulated other comprehensive loss as of March 31, 2018, which are expected to be recognized as a component of net periodic benefit cost in fiscal year 2019 (in thousands):
 
 
Year Ending
March 31, 2019
Amortization of net prior service credits
 
$
(381
)
Amortization of net actuarial loss
 
95

 
 
$
(286
)
Schedule of actuarial assumptions for the pension plans
The Company reassesses its benefit plan assumptions on a regular basis. The actuarial assumptions for the defined benefit plans for fiscal years 2018 and 2017 were as follows:
 
 
Years Ended March 31,
 
 
2018
 
2017
Benefit Obligations:
 
 
 
 
Discount rate
 
0.85%-7.5%
 
0.75%-7.00%
Estimated rate of compensation increase
 
2.25%-10.00%
 
2.5%-10.00%
Periodic Costs:
 
 
 
 
Discount rate
 
0.75%-7.00%
 
0.5%-8.00%
Estimated rate of compensation increase
 
2.5%-10.00%
 
2.5%-10.00%
Expected average rate of return on plan assets
 
1.0%-2.5%
 
1.0%-2.75%
Schedule of expected benefit payments
The following table reflects the benefit payments that the Company expects the plans to pay in the periods noted (in thousands):
Years Ending March 31,
 
 
2019
 
$
7,199

2020
 
7,701

2021
 
7,046

2022
 
7,341

2023
 
7,064

2024-2028
 
38,546

 
 
$
74,897