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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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