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Fair Value Measurements - Financial Assets and Liabilities, Classified by Level (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Mar. 31, 2024
Deferred compensation    
Assets:    
Investments in privately held companies $ 27,976 $ 28,662
Recurring | Level 1    
Assets:    
Cash equivalents 926,645 1,042,604
Investments in privately held companies 31,929 29,174
Currency derivative assets included in other current assets 0 0
Liabilities:    
Contingent consideration included in accrued and other current liabilities 0 0
Currency derivative liabilities included in accrued and other current liabilities 0 0
Recurring | Level 1 | Deferred compensation | Cash    
Assets:    
Investments in privately held companies 203 312
Recurring | Level 1 | Deferred compensation | Common stock    
Assets:    
Investments in privately held companies 710 573
Recurring | Level 1 | Deferred compensation | Money market funds    
Assets:    
Investments in privately held companies 8,456 8,129
Recurring | Level 1 | Deferred compensation | Mutual funds    
Assets:    
Investments in privately held companies 22,560 20,160
Recurring | Level 2    
Assets:    
Cash equivalents 0 0
Investments in privately held companies 0 0
Currency derivative assets included in other current assets 168 913
Liabilities:    
Contingent consideration included in accrued and other current liabilities 0 0
Currency derivative liabilities included in accrued and other current liabilities 714 573
Recurring | Level 2 | Deferred compensation | Cash    
Assets:    
Investments in privately held companies 0 0
Recurring | Level 2 | Deferred compensation | Common stock    
Assets:    
Investments in privately held companies 0 0
Recurring | Level 2 | Deferred compensation | Money market funds    
Assets:    
Investments in privately held companies 0 0
Recurring | Level 2 | Deferred compensation | Mutual funds    
Assets:    
Investments in privately held companies 0 0
Recurring | Level 3    
Assets:    
Cash equivalents 0 0
Investments in privately held companies 0 0
Currency derivative assets included in other current assets 0 0
Liabilities:    
Contingent consideration included in accrued and other current liabilities 0 1,215
Currency derivative liabilities included in accrued and other current liabilities 0 0
Recurring | Level 3 | Deferred compensation | Cash    
Assets:    
Investments in privately held companies 0 0
Recurring | Level 3 | Deferred compensation | Common stock    
Assets:    
Investments in privately held companies 0 0
Recurring | Level 3 | Deferred compensation | Money market funds    
Assets:    
Investments in privately held companies 0 0
Recurring | Level 3 | Deferred compensation | Mutual funds    
Assets:    
Investments in privately held companies $ 0 $ 0