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The Company and Summary of Significant Accounting Policies and Estimates - Narrative (Details) - USD ($) $ in Thousands	6 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Mar. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cash flows from operating activities	$ 67,500	$ 91,886
Cash flow from financing activities	108,636	$ 132,550
Cumulative-effect adjustment to retained earnings			$ 57,205
Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative-effect adjustment to retained earnings			53,912
Accounting Standards Update 2016-09, Excess Tax Benefit Component Increase to Operating Cash FLows
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cash flows from operating activities	4,100
Gross excess tax benefits			75,200
Tax benefit valuation allowance			18,000
Accounting Standards Update 2016-09, Excess Tax Benefit Component Increase to Operating Cash FLows | Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative-effect adjustment to retained earnings			57,200
Accounting Standards Update 2016-09, Excess Tax Benefit Component Decrease to Financing Cash Flows
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cash flow from financing activities	$ 4,100
Accounting Standards Update 2016-09, Forfeiture Rate Component | Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncement, Cumulative Effect of Change on Retained Earning			$ 3,300

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