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Income Taxes (Effective Income Tax Rate Reconciliation) (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2021
Income Tax Disclosure [Abstract]      
Expected tax provision at statutory income tax rates $ 39,399 $ 65,945 $ 97,590
Income taxes at different rates 38,467 61,296 88,760
Research and development tax credits (152) (5,957) (3,844)
Executive compensation 749 4,683 4,821
Stock-based compensation 5,736 (9,141) (3,161)
Deferred tax effects from TRAF 0 0 1,944
Valuation allowance 908 887 (247)
Impairment 1,881 0 0
Restructuring charges / (credits) (1,764) 0 (5)
Unrecognized tax benefits 13,284 16,577 15,978
Audit settlement 0 (3,655) 0
Other, net 439 670 (973)
Provision for income taxes $ 98,947 $ 131,305 $ 200,863