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Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 | Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2016
Advertising Costs |  |  |  |
Advertising costs |  | $ 233,700 | $ 208,700 | $ 181,700
Inventories |  |  |  |
Inventory liability | $ 7,200 | 12,600 | 7,200 |
New Accounting Pronouncements and Changes in Accounting Principles [Abstract] |  |  |  |
Amounts reclassified to operating activities |  | 346,261 | 288,389 | 185,195
Amounts reclassified from financing activities |  | 127,873 | 155,717 | 143,753
Cumulative-effect adjustment to retained earnings | 57,209 |  | 57,209 |
Deferred tax assets | 66,407 | 112,646 | 66,407 |
Net sales |  | 2,566,863 | 2,221,427 | $ 2,018,100
Valuation allowance | 6,626 | $ 25,148 | $ 6,626 |
Change in Accounting Method Accounted for as Change in Estimate |  |  |  |
New Accounting Pronouncements and Changes in Accounting Principles [Abstract] |  |  |  |
Net sales | 14,400 |  |  |
Minimum |  |  |  |
Concentration of Credit Risk |  |  |  |
Customer payment term |  | 30 days |  |
Intangible Assets |  |  |  |
Estimated useful life |  | 4 years |  |
Maximum |  |  |  |
Concentration of Credit Risk |  |  |  |
Customer payment term |  | 60 days |  |
Intangible Assets |  |  |  |
Estimated useful life |  | 8 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 |  |
Customer One | Customer Concentration | Consolidated net sales |  |  |  |
Concentration of Credit Risk |  |  |  |
Concentration credit risk by major customer (as a percent) |  | 15.00% | 15.00% | 14.00%
Customer One | Credit concentration | Accounts receivable |  |  |  |
Concentration of Credit Risk |  |  |  |
Concentration credit risk by major customer (as a percent) |  | 15.00% | 18.00% |
Customer Two | Customer Concentration | Consolidated net sales |  |  |  |
Concentration of Credit Risk |  |  |  |
Concentration credit risk by major customer (as a percent) |  | 13.00% | 12.00% | 10.00%
Customer Two | Credit concentration | Accounts receivable |  |  |  |
Concentration of Credit Risk |  |  |  |
Concentration credit risk by major customer (as a percent) |  | 12.00% | 12.00% |
Customer Three | Credit concentration | Accounts receivable |  |  |  |
Concentration of Credit Risk |  |  |  |
Concentration credit risk by major customer (as a percent) |  | 11.00% |  |
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 |  | 3 years
Accounting Standards Update 2016-09, Excess Tax Benefit Component |  |  |  |
New Accounting Pronouncements and Changes in Accounting Principles [Abstract] |  |  |  |
Amounts reclassified to operating activities |  |  | $ 9,700 | $ 2,100
Deferred tax assets | 75,200 |  | 75,200 |
Valuation allowance | 18,000 |  | 18,000 |
Accounting Standards Update 2016-09, Excess Tax Benefit Component Decrease to Financing Activities |  |  |  |
New Accounting Pronouncements and Changes in Accounting Principles [Abstract] |  |  |  |
Amounts reclassified from financing activities |  |  | 9,700 | 2,100
Retained earnings |  |  |  |
New Accounting Pronouncements and Changes in Accounting Principles [Abstract] |  |  |  |
Cumulative-effect adjustment to retained earnings | 53,912 |  | 53,912 |
Retained earnings | Accounting Standards Update 2016-09, Excess Tax Benefit Component |  |  |  |
New Accounting Pronouncements and Changes in Accounting Principles [Abstract] |  |  |  |
Cumulative-effect adjustment to retained earnings | 57,200 |  | 57,200 |
Retained earnings | Accounting Standards Update 2016-09, Forfeiture Rate Component |  |  |  |
New Accounting Pronouncements and Changes in Accounting Principles [Abstract] |  |  |  |
Cumulative effect of change on retained earning | $ 3,300 |  | 3,300 |
Operating Expense |  |  |  |
Advertising Costs |  |  |  |
Advertising costs |  | $ 36,700 | $ 32,200 | $ 23,600
Designated as hedging instruments: | Cash flow hedges | Foreign Exchange Forward |  |  |  |
Other Intangible Assets |  |  |  |
Derivative term of contract |  | 4 months |  |

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