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Employee Benefit Plans (Tables) | 12 Months Ended
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Mar. 31, 2019
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 benefit recognized for fiscal years 2019, 2018 and 2017 (in thousands):
|  | Years Ended March 31,
|  | 2019 |  | 2018 |  | 2017
Cost of goods sold |  | $ | 3,812 |  |  | $ | 3,733 |  |  | $ | 2,663 |
Marketing and selling |  | 20,630 |  |  | 17,765 |  |  | 14,723 |
Research and development |  | 7,368 |  |  | 6,381 |  |  | 4,200 |
General and administrative |  | 18,455 |  |  | 16,259 |  |  | 14,304 |
Total share-based compensation expense |  | 50,265 |  |  | 44,138 |  |  | 35,890 |
Income tax benefit |  | (17,091 | ) |  | (15,998 | ) |  | (8,536 | )
Total share-based compensation expense, net of income tax benefit |  | $ | 33,174 |  |  | $ | 28,140 |  |  | $ | 27,354 |
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 period 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, 2019
|  | Unamortized Expense |  | Remaining Months
ESPP |  | $ | 1,515 |  |  | 4
Stock Options |  | 7,384 |  |  | 35
Time-based RSUs |  | 65,798 |  |  | 33
Market-based and performance-based RSUs |  | 16,277 |  |  | 20
Total unamortized share-based compensation expense |  | $ | 90,974 |  |  |
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 is determined with the following assumptions and values:
|  | Stock Options |  | Employee Stock Purchase Plans
|  | Years Ended March 31, |  | Years Ended March 31,
|  | 2019 |  | 2018 |  | 2017 |  | 2019 |  | 2018 |  | 2017
Dividend yield |  | 1.72 | % |  | * |  | * |  | 1.73 | % |  | 1.67 | % |  | 2.50 | %
Risk-free interest rate |  | 2.45 | % |  | * |  | * |  | 2.35 | % |  | 1.37 | % |  | 0.51 | %
Expected volatility |  | 33 | % |  | * |  | * |  | 31 | % |  | 27 | % |  | 35 | %
Expected life (years) |  | 6.2 |  |  | * |  | * |  | 0.5 |  |  | 0.5 |  |  | 0.5 |
Weighted average grant date fair value per share |  | $ | 11.55 |  |  | * |  | * |  | $ | 9.33 |  |  | $ | 8.69 |  |  | $ | 5.73 |
* Not applicable as no stock options were granted in the period.
RSUs with Market Conditions |  | Years Ended March 31,
|  | 2019 |  | 2018 |  | 2017
Dividend yield |  | 1.59 | % |  | 1.75 | % |  | 3.29 | %
Risk-free interest rate |  | 2.51 | % |  | 1.40 | % |  | 0.86 | %
Expected volatility |  | 30 | % |  | 31 | % |  | 34 | %
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 2019, 2018 and 2017 is as follows:
|  | Number of Shares |  | Weighted-Average Exercise Price |  | Weighted-Average Remaining Contractual Term |  | Aggregate Intrinsic Value
|  | (In thousands) |  |  |  | (Years) |  | (In thousands)
Outstanding, March 31, 2016 |  | 5,334 |  |  |  |  |  |  |  |
Granted |  | — |  |  |  |  |  |  |  |
Exercised |  | (1,784 | ) |  |  |  |  |  |  | $ | 14,627 |
Canceled or expired |  | (500 | ) |  |  |  |  |  |  |
Outstanding, March 31, 2017 |  | 3,050 |  |  |  |  |  |  |  |
Granted |  | — |  |  |  |  |  |  |  |
Exercised |  | (994 | ) |  |  |  |  |  |  | $ | 8,347 |
Canceled or expired |  | (16 | ) |  |  |  |  |  |  |
Outstanding, March 31, 2018 |  | 2,040 |  |  | $ | 14 |  |  |  |  |  |
Granted |  | 649 |  |  | $ | 39 |  |  |  |  |  |
Exercised |  | (82 | ) |  | $ | 21 |  |  |  |  | $ | 1,707 |
Canceled or expired |  | — |  |  |  |  |  |  |  |  |
Outstanding, March 31, 2019 |  | 2,607 |  |  | $ | 20 |  |  | 4.8 |  | $ | 51,005 |
Vested and exercisable, March 31, 2019 |  | 1,958 |  |  | $ | 13 |  |  | 3.1 |  | $ | 50,593 |
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 2019, 2018 and 2017 is as follows:
|  | 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, 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 - performance-based |  | 409 |  |  | $ | 33 |  |  |  |  |
Vested |  | (2,248 | ) |  |  |  |  |  |  | $ | 81,582 |
Canceled or expired |  | (333 | ) |  |  |  |  |  |  |
Outstanding, March 31, 2018 |  | 5,221 |  |  | $ | 20 |  |  |  |  |
Granted—time-based |  | 1,290 |  |  | $ | 40 |  |  |  |  |
Granted—market and performance-based |  | 381 |  |  | $ | 39 |  |  |  |  |
Vested |  | (2,148 | ) |  | $ | 17 |  |  |  |  | $ | 89,159 |
Canceled or expired |  | (323 | ) |  | $ | 26 |  |  |  |  |
Outstanding, March 31, 2019 |  | 4,421 |  |  | $ | 29 |  |  | 1.2 |  | $ | 173,970 |
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 2019, 2018 and 2017 was as follows (in thousands):
|  | Years Ended March 31,
|  | 2019 |  | 2018 |  | 2017
Service costs |  | $ | 10,564 |  |  | $ | 9,715 |  |  | $ | 10,385 |
Interest costs |  | 1,301 |  |  | 1,126 |  |  | 800 |
Expected return on plan assets |  | (2,167 | ) |  | (1,792 | ) |  | (1,724 | )
Amortization: |  |  |  |  |  |
Net transition obligation |  | — |  |  | — |  |  | 4 |
Net prior service credit recognized |  | (443 | ) |  | (51 | ) |  | (117 | )
Net actuarial loss recognized |  | 450 |  |  | 242 |  |  | 1,032 |
Settlement |  | (97 | ) |  | — |  |  | — |
Total net periodic benefit cost |  | $ | 9,608 |  |  | $ | 9,240 |  |  | $ | 10,380 |
Schedule of changes in projected benefit obligations | The changes in projected benefit obligations for fiscal years 2019 and 2018 were as follows (in thousands):
|  | Years Ended March 31,
|  | 2019 |  | 2018
Projected benefit obligations, beginning of the year |  | $ | 128,915 |  |  | $ | 114,640 |
Service costs |  | 10,564 |  |  | 9,715 |
Interest costs |  | 1,301 |  |  | 1,126 |
Plan participant contributions |  | 3,666 |  |  | 3,522 |
Actuarial gains (losses) |  | 9,506 |  |  | (1,580 | )
Benefits paid |  | (3,793 | ) |  | (1,202 | )
Plan amendment related to statutory change |  | (705 | ) |  | (2,519 | )
Settlement and curtailment |  | (335 | ) |  | — |
Administrative expense paid |  | (142 | ) |  | (144 | )
Currency exchange rate changes and other |  | (5,315 | ) |  | 5,357 |
Projected benefit obligations, end of the year |  | $ | 143,662 |  |  | $ | 128,915 |
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 2019 and 2018 (in thousands):
|  | Years Ended March 31,
|  | 2019 |  | 2018
Fair value of plan assets, beginning of the year |  | $ | 84,718 |  |  | $ | 71,376 |
Actual return on plan assets |  | 3,350 |  |  | 1,824 |
Employer contributions |  | 6,383 |  |  | 5,995 |
Plan participant contributions |  | 3,666 |  |  | 3,522 |
Benefits paid |  | (3,793 | ) |  | (1,202 | )
Settlement and curtailment |  | (335 | ) |  | — |
Administrative expenses paid |  | (142 | ) |  | (144 | )
Currency exchange rate changes |  | (3,482 | ) |  | 3,347 |
Fair value of plan assets, end of the year |  | $ | 90,365 |  |  | $ | 84,718 |
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, 2019 and 2018 (in thousands):
|  | March 31,
|  | 2019 |  | 2018
|  | Level 1 |  | Level 2 |  | Total |  | Level 1 |  | Level 2 |  | Total
Cash and cash equivalents |  | $ | 10,737 |  |  | $ | — |  |  | $ | 10,737 |  |  | $ | 18,331 |  |  | $ | 24 |  |  | $ | 18,355 |
Equity securities |  | 27,559 |  |  | — |  |  | 27,559 |  |  | 26,204 |  |  | — |  |  | 26,204 |
Debt securities |  | 26,823 |  |  | — |  |  | 26,823 |  |  | 25,150 |  |  | — |  |  | 25,150 |
Swiss real estate funds |  | 21,659 |  |  | — |  |  | 21,659 |  |  | 12,096 |  |  | — |  |  | 12,096 |
Hedge funds |  | — |  |  | 912 |  |  | 912 |  |  | — |  |  | — |  |  | — |
Other |  | 2,377 |  |  | 298 |  |  | 2,675 |  |  | 2,623 |  |  | 290 |  |  | 2,913 |
Total fair value of plan assets |  | $ | 89,155 |  |  | $ | 1,210 |  |  | $ | 90,365 |  |  | $ | 84,404 |  |  | $ | 314 |  |  | $ | 84,718 |
Schedule of net funded status | The funded status of the plans was as follows (in thousands):
|  | Years Ended March 31,
|  | 2019 |  | 2018
Fair value of plan assets |  | $ | 90,365 |  |  | $ | 84,718 |
Less: projected benefit obligations |  | 143,662 |  |  | 128,915 |
Underfunded status |  | $ | (53,297 | ) |  | $ | (44,197 | )
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,
|  | 2019 |  | 2018
Current liabilities |  | $ | 1,849 |  |  | $ | 1,763 |
Non-current liabilities |  | 51,448 |  |  | 42,434 |
Total liabilities |  | $ | 53,297 |  |  | $ | 44,197 |
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,
|  | 2019 |  | 2018 |  | 2017
Net prior service credits |  | $ | 3,965 |  |  | $ | 3,843 |  |  | $ | 1,274 |
Net actuarial loss |  | (17,630 | ) |  | (9,821 | ) |  | (11,407 | )
Accumulated other comprehensive loss |  | (13,665 | ) |  | (5,978 | ) |  | (10,133 | )
Deferred tax |  | (267 | ) |  | (420 | ) |  | (347 | )
Accumulated other comprehensive loss, net of tax |  | $ | (13,932 | ) |  | $ | (6,398 | ) |  | $ | (10,480 | )
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, 2019, which are expected to be recognized as a component of net periodic benefit cost in fiscal year 2020 (in thousands):
|  | Year Ending March 31, 2020
Amortization of net prior service credits |  | $ | (432 | )
Amortization of net actuarial loss |  | 645 |
|  | $ | 213 |
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 2019 and 2018 were as follows:
|  | Years Ended March 31,
|  | 2019 |  | 2018
Benefit Obligations: |  |  |  |
Discount rate |  | 0.55% - 7.25% |  | 0.85%-7.50%
Estimated rate of compensation increase |  | 2.50% - 10.00% |  | 2.25%-10.00%
Periodic Costs: |  |  |  |
Discount rate |  | 0.75% - 7.50% |  | 0.75%-7.00%
Estimated rate of compensation increase |  | 2.50% - 10.00% |  | 2.50%-10.00%
Expected average rate of return on plan assets |  | 0.75% - 2.75% |  | 1.00%-2.50%
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, |  |
2020 |  | $ | 7,956 |
2021 |  | 7,225 |
2022 |  | 7,553 |
2023 |  | 7,294 |
2024 |  | 7,607 |
2025-2029 |  | 39,367 |
|  | $ | 77,002 |

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- Definition Tabular disclosure of the major categories of plan assets of pension plans and/or other employee benefit plans. This information may include, but is not limited to, the target allocation of plan assets, the fair value of each major category of plan assets, and the level within the fair value hierarchy in which the fair value measurements fall. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the amounts related to pension plans and/or other employee benefit plans in accumulated other comprehensive income (loss) expected to be recognized as components of net periodic benefit cost over the next fiscal year, including the net gain (loss), net prior service cost or credit, and net transition asset or obligation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (s) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the amounts that are recognized in the balance sheet (or statement of financial position) for pension plans and/or other employee benefit plans, showing separately the assets and current and noncurrent liabilities (if applicable) recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the net gain (loss) and net prior service cost or credit recognized in other comprehensive income (loss) for the period for pension plans and/or other employee benefit plans, and reclassification adjustments of other comprehensive income (loss) for the period, as those amounts, including amortization of the net transition asset or obligation, are recognized as components of net periodic benefit cost. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the assumptions used to determine for pension plans and/or other employee benefit plans the benefit obligation and net benefit cost, including assumed discount rates, rate increase in compensation increase, and expected long-term rates of return on plan assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the total compensation cost related to nonvested awards not yet recognized and the weighted-average period over which it is expected to be recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration