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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