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Summary of Significant Accounting Policies (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018
Revenue Recognition |  |  |  |
Sales contract with customer term | 1 year |  |  |
Retained earnings | $ 2,490,578 | $ 1,690,579 |  |
Advertising Costs |  |  |  |
Advertising costs | 450,000 | 298,600 | $ 278,200 |
Inventories |  |  |  |
Inventory liability | $ 11,800 | $ 9,600 |  |
Leases |  |  |  |
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] | Other assets | Other assets |  |
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] | Accrued and other current liabilities | Accrued and other current liabilities |  |
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] | us-gaap:OtherLiabilitiesNoncurrent | us-gaap:OtherLiabilitiesNoncurrent |  |
Recent Accounting Pronouncements Adopted |  |  |  |
Cumulative effect adjustment from adoption | $ 2,261,789 | $ 1,489,268 | 1,176,339 | $ 1,050,557
Retained earnings |  |  |  |
Recent Accounting Pronouncements Adopted |  |  |  |
Cumulative effect adjustment from adoption | $ 2,490,578 | 1,690,579 | 1,365,036 | 1,232,316
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |
Recent Accounting Pronouncements Adopted |  |  |  |
Cumulative effect adjustment from adoption |  | (553) |  | (10,882)
Cumulative Effect, Period of Adoption, Adjustment | Retained earnings |  |  |  |
Recent Accounting Pronouncements Adopted |  |  |  |
Cumulative effect adjustment from adoption |  | (553) |  | (10,882)
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2014-09 |  |  |  |
Revenue Recognition |  |  |  |
Retained earnings |  |  |  | $ (10,800)
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2016-13 | Retained earnings |  |  |  |
Recent Accounting Pronouncements Adopted |  |  |  |
Cumulative effect adjustment from adoption |  | 600 |  |
Minimum |  |  |  |
Revenue Recognition |  |  |  |
Post-contract customer support revenue recognition period | 1 year |  |  |
Required customer payment period | 30 days |  |  |
Intangible Assets |  |  |  |
Estimated useful life | 1 year |  |  |
Product Warranties |  |  |  |
Product warranty period | 1 year |  |  |
Maximum |  |  |  |
Revenue Recognition |  |  |  |
Post-contract customer support revenue recognition period | 2 years |  |  |
Required customer payment period | 60 days |  |  |
Intangible Assets |  |  |  |
Estimated useful life | 10 years |  |  |
Product Warranties |  |  |  |
Product warranty period | 3 years |  |  |
Plant and buildings | Maximum |  |  |  |
Property, Plant and Equipment |  |  |  |
Estimated useful life | 25 years |  |  |
Equipment | Minimum |  |  |  |
Property, Plant and Equipment |  |  |  |
Estimated useful life | 3 years |  |  |
Equipment | Maximum |  |  |  |
Property, Plant and Equipment |  |  |  |
Estimated useful life | 5 years |  |  |
Internal-use software | Minimum |  |  |  |
Property, Plant and Equipment |  |  |  |
Estimated useful life | 3 years |  |  |
Internal-use software | Maximum |  |  |  |
Property, Plant and Equipment |  |  |  |
Estimated useful life | 10 years |  |  |
Tooling | Minimum |  |  |  |
Property, Plant and Equipment |  |  |  |
Estimated useful life | 6 months |  |  |
Tooling | Maximum |  |  |  |
Property, Plant and Equipment |  |  |  |
Estimated useful life | 1 year |  |  |
Leasehold Improvements | Maximum |  |  |  |
Property, Plant and Equipment |  |  |  |
Estimated useful life | 10 years |  |  |
Performance-based RSU | Maximum |  |  |  |
Share-based Compensation Expense |  |  |  |
Share based compensation expense recognition period | 3 years |  |  |
Market Based RSUs | 2006 Plan |  |  |  |
Share-based Compensation Expense |  |  |  |
Vesting period | 3 years |  |  |
Operating Expense |  |  |  |
Advertising Costs |  |  |  |
Advertising costs | $ 168,200 | $ 64,500 | $ 58,800 |

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