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Employee Benefit Plans (Unamortized Share-Based Compensation Expense) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018
Employee Benefit Plan |  |  |
Unamortized Expense | $ 90,536 |  |
ESPP |  |  |
Employee Benefit Plan |  |  |
Unamortized Expense | $ 1,442 |  |
Remaining Months | 4 months |  |
Stock Options |  |  |
Employee Benefit Plan |  |  |
Unamortized Expense | $ 4,369 |  |
Remaining Months | 24 months |  |
Time-based RSUs |  |  |
Employee Benefit Plan |  |  |
Unamortized Expense | $ 71,545 |  |
Remaining Months | 26 months |  |
Market-based and performance-based RSUs |  |  |
Employee Benefit Plan |  |  |
Unamortized Expense | $ 13,180 |  |
Remaining Months | 21 months |  |
Restricted Stock Units (RSUs) |  |  |
Employee Benefit Plan |  |  |
Tax benefit realized for the tax deduction from RSUs vested during period | $ 12,100 | $ 16,200 | $ 20,300

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- Definition Amount of cost not yet recognized for nonvested award under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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