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Fair Value Measurements (Financial Assets and Liabilities, Classified by Level) (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Mar. 31, 2017
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Trading investments for deferred compensation plan | $ 17,748 | $ 15,043
Level 1 | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Cash equivalents | 492,535 | 448,742
Trading investments for deferred compensation plan | 17,748 | 15,043
Acquisition-related contingent consideration included in accrued and other current liabilities and other non-current liabilities | 0 | 0
Level 1 | Money market funds | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Trading investments for deferred compensation plan | 2,881 | 2,813
Level 1 | Mutual funds | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Trading investments for deferred compensation plan | 14,867 | 12,230
Level 2 | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Cash equivalents | 0 | 0
Trading investments for deferred compensation plan | 0 | 0
Acquisition-related contingent consideration included in accrued and other current liabilities and other non-current liabilities | 0 | 0
Level 2 | Money market funds | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Trading investments for deferred compensation plan | 0 | 0
Level 2 | Mutual funds | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Trading investments for deferred compensation plan | 0 | 0
Level 3 | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Cash equivalents | 0 | 0
Trading investments for deferred compensation plan | 0 | 0
Acquisition-related contingent consideration included in accrued and other current liabilities and other non-current liabilities | 0 | 9,908
Level 3 | Money market funds | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Trading investments for deferred compensation plan | 0 | 0
Level 3 | Mutual funds | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Trading investments for deferred compensation plan | 0 | 0
Foreign exchange contract | Level 1 | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Currency derivative assets included in other current assets | 0 | 0
Currency derivative liabilities included in accrued and other current liabilities | 0 | 0
Foreign exchange contract | Level 2 | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Currency derivative assets included in other current assets | 0 | 48
Currency derivative liabilities included in accrued and other current liabilities | 34 | 443
Foreign exchange contract | Level 3 | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Currency derivative assets included in other current assets | 0 | 0
Currency derivative liabilities included in accrued and other current liabilities | $ 0 | $ 0

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- Definition Amount of short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Fair value of liability associated with financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226003-175313 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959 + Details
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