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Fair Value Measurements (Financial Assets and Liabilities, Classified by Level) (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Mar. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Trading investments for deferred compensation plan $ 24,809 $ 20,085
Fair value of contingent consideration (earn-out) 6,967 23,284
Level 1 | Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Cash equivalents 669,759 564,952
Trading investments for deferred compensation plan 24,809 20,085
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
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
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
Fair value of contingent consideration (earn-out) 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 5,452 129
Fair value of contingent consideration (earn-out) 0 0
Currency derivative liabilities included in accrued and other current liabilities 100 719
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
Fair value of contingent consideration (earn-out) 6,430 23,284
Currency derivative liabilities included in accrued and other current liabilities 0 0
Cash | Level 1 | Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Trading investments for deferred compensation plan 31 846
Cash | Level 2 | Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Trading investments for deferred compensation plan 0 0
Cash | Level 3 | Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Trading investments for deferred compensation plan 0 0
Common stock | Level 1 | Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Trading investments for deferred compensation plan 1,569 0
Common stock | Level 2 | Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Trading investments for deferred compensation plan 0 0
Common stock | Level 3 | Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Trading investments for deferred compensation plan 0 0
Money Market Funds | Level 1 | Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Trading investments for deferred compensation plan 6,734 7,147
Money Market Funds | Level 2 | Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Trading investments for deferred compensation plan 0 0
Money Market Funds | Level 3 | Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Trading investments for deferred compensation plan 0 0
Mutual Funds | Level 1 | Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Trading investments for deferred compensation plan 16,475 12,092
Mutual Funds | Level 2 | Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Trading investments for deferred compensation plan 0 0
Mutual Funds | Level 3 | Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Trading investments for deferred compensation plan $ 0 $ 0