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Summary of Significant Accounting Policies (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018 | Apr. 01, 2019 | Apr. 01, 2018 | Apr. 01, 2017
Revenue Recognition |  |  |  |  |  |
Sales contract with customer term | 1 year |  |  |  |  |
Advertising Costs |  |  |  |  |  |
Advertising costs | $ 298,600 | $ 278,200 | $ 233,700 |  |  |
Inventories |  |  |  |  |  |
Inventory liability | 9,600 | 14,100 |  |  |  |
Share-based Compensation Expense |  |  |  |  |  |
Cumulative effect adjustment to retained earnings |  |  |  |  | $ (10,882) | $ 57,209
Gross deferred tax assets | 298,896 | 135,309 |  |  |  |
Valuation allowance | 29,171 | 28,375 |  |  |  |
New Accounting Pronouncements and Changes in Accounting Principles [Abstract] |  |  |  |  |  |
Right of use asset | 25,557 |  |  | $ 31,300 |  |
Present value of lease liabilities | $ 30,481 |  |  |  |  |
Deferred rent for leases |  |  |  | 6,100 |  |
Minimum |  |  |  |  |  |
Revenue Recognition |  |  |  |  |  |
Post-contract customer support revenue recognition period | 1 year |  |  |  |  |
Required customer payment period | 30 days |  |  |  |  |
Intangible Assets |  |  |  |  |  |
Estimated useful life | 2 years |  |  |  |  |
Share-based Compensation Expense |  |  |  |  |  |
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 |  |  |  |  |
Share-based Compensation Expense |  |  |  |  |  |
Product warranty period | 5 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 | Minimum |  |  |  |  |  |
Share-based Compensation Expense |  |  |  |  |  |
Share based compensation expense recognition period | 1 year |  |  |  |  |
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 |  |  |  |  |
Accounting Standards Update 2016-09, Excess Tax Benefit Component |  |  |  |  |  |
Share-based Compensation Expense |  |  |  |  |  |
Gross deferred tax assets |  |  |  |  |  | 75,200
Valuation allowance |  |  |  |  |  | 18,000
Accounting Standards Update 2016-02 |  |  |  |  |  |
New Accounting Pronouncements and Changes in Accounting Principles [Abstract] |  |  |  |  |  |
Present value of lease liabilities |  |  |  | $ 37,400 |  |
Retained earnings |  |  |  |  |  |
Share-based Compensation Expense |  |  |  |  |  |
Cumulative effect adjustment to retained earnings |  |  |  |  | $ (10,882) | 53,912
Retained earnings | Accounting Standards Update 2016-09, Forfeiture Rate Component |  |  |  |  |  |
Share-based Compensation Expense |  |  |  |  |  |
Cumulative effect of change on retained earning |  |  |  |  |  | 3,300
Retained earnings | Accounting Standards Update 2016-09, Excess Tax Benefit Component |  |  |  |  |  |
Share-based Compensation Expense |  |  |  |  |  |
Cumulative effect adjustment to retained earnings |  |  |  |  |  | $ 57,200
Operating Expense |  |  |  |  |  |
Advertising Costs |  |  |  |  |  |
Advertising costs | $ 64,500 | $ 58,800 | $ 36,700 |  |  |

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