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Summary of Significant Accounting Policies (Narrative) (Details) - USD ($) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017 | Apr. 01, 2019 | Apr. 01, 2018 | Apr. 01, 2017
Revenue Recognition |  |  |  |  |  |
Sales contract with customer term | 1 year |  |  |  |  |
Advertising Costs |  |  |  |  |  |
Advertising costs | $ 278,200,000 | $ 233,700,000 | $ 208,700,000 |  |  |
Inventories |  |  |  |  |  |
Inventory liability | 14,100,000 | 12,600,000 |  |  |  |
Share-based Compensation Expense |  |  |  |  |  |
Cumulative effect adjustment to retained earnings |  |  |  |  | $ (10,882,000) | $ 57,209,000
Gross deferred tax assets | 135,309,000 | 112,646,000 |  |  |  |
Valuation allowance | 28,375,000 | 25,148,000 |  |  |  |
New Accounting Pronouncements and Changes in Accounting Principles [Abstract] |  |  |  |  |  |
Accrued and other current liabilities | 433,897,000 | 281,732,000 |  |  | 404,577,000 |
Other current assets | 69,116,000 | 56,362,000 |  |  | 62,557,000 |
Accounts receivable, net | $ 383,309,000 | 214,885,000 |  |  | 320,653,000 |
Minimum |  |  |  |  |  |
Revenue Recognition |  |  |  |  |  |
Post-contract customer support revenue recognition period | 1 year |  |  |  |  |
Required customer payment period | 30 days |  |  |  |  |
Concentration of Credit Risk |  |  |  |  |  |
Customer payment term | 30 days |  |  |  |  |
Intangible Assets |  |  |  |  |  |
Estimated useful life | 4 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 |  |  |  |  |
Concentration of Credit Risk |  |  |  |  |  |
Customer payment term | 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 | 7 years |  |  |  |  |
Tooling | Minimum |  |  |  |  |  |
Property, Plant and Equipment |  |  |  |  |  |
Estimated useful life | 6 months |  |  |  |  |
Tooling | Maximum |  |  |  |  |  |
Property, Plant and Equipment |  |  |  |  |  |
Estimated useful life | 1 year |  |  |  |  |
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 |  |  |  |  |  | 75,200,000
Valuation allowance |  |  |  |  |  | 18,000,000.0
Retained earnings |  |  |  |  |  |
Share-based Compensation Expense |  |  |  |  |  |
Cumulative effect adjustment to retained earnings |  |  |  |  | (10,882,000) | 53,912,000
Retained earnings | Accounting Standards Update 2016-09, Forfeiture Rate Component |  |  |  |  |  |
Share-based Compensation Expense |  |  |  |  |  |
Cumulative effect of change on retained earning |  |  |  |  |  | 3,300,000
Retained earnings | Accounting Standards Update 2016-09, Excess Tax Benefit Component |  |  |  |  |  |
Share-based Compensation Expense |  |  |  |  |  |
Cumulative effect adjustment to retained earnings |  |  |  |  |  | $ 57,200,000
Operating Expense |  |  |  |  |  |
Advertising Costs |  |  |  |  |  |
Advertising costs | $ 58,800,000 | 36,700,000 | $ 32,200,000 |  |  |
Calculated under Revenue Guidance in Effect before Topic 606 |  |  |  |  |  |
New Accounting Pronouncements and Changes in Accounting Principles [Abstract] |  |  |  |  |  |
Accrued and other current liabilities | 295,126,000 | 281,732,000 |  |  |  |
Other current assets | 60,449,000 | 56,362,000 |  |  |  |
Accounts receivable, net | $ 260,401,000 | 214,885,000 |  |  |  |
Sales Returns | Accounting Standards Update 2014-09 |  |  |  |  |  |
New Accounting Pronouncements and Changes in Accounting Principles [Abstract] |  |  |  |  |  |
Accrued and other current liabilities |  | 31,400,000 |  |  |  |
Other current assets |  | 6,200,000 |  |  |  |
Sales Returns | Calculated under Revenue Guidance in Effect before Topic 606 |  |  |  |  |  |
New Accounting Pronouncements and Changes in Accounting Principles [Abstract] |  |  |  |  |  |
Accounts receivable net of sale return allowance |  | 31,400,000 |  |  |  |
Reserve for inventory return |  | 11,400,000 |  |  |  |
Expected scrap cost |  | $ 5,200,000 |  |  |  |
Scenario, Forecast | Subsequent Event | Minimum |  |  |  |  |  |
New Accounting Pronouncements and Changes in Accounting Principles [Abstract] |  |  |  |  |  |
Right of use asset |  |  |  | $ 25,000,000 |  |
Operating lease liability |  |  |  | 30,000,000 |  |
Scenario, Forecast | Subsequent Event | Maximum |  |  |  |  |  |
New Accounting Pronouncements and Changes in Accounting Principles [Abstract] |  |  |  |  |  |
Right of use asset |  |  |  | 35,000,000 |  |
Operating lease liability |  |  |  | $ 40,000,000 |  |
Balance Sheet Reclassification | Customer Programs | Calculated under Revenue Guidance in Effect before Topic 606 |  |  |  |  |  |
New Accounting Pronouncements and Changes in Accounting Principles [Abstract] |  |  |  |  |  |
Accounts receivable, net |  |  |  |  | $ 76,700,000 |

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