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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Cash flows from operating activities:    
Net income (loss) $ 22,149 $ (434,349)
Adjustments to reconcile net income (loss) to cash provided by operating activities:    
Depreciation and amortization 28,811 32,505
Operating lease right-of-use asset amortization 5,004 5,227
Loss on disposal of fixed assets 5 15
Share-based compensation expense 33,516 36,084
Goodwill impairment 0 426,967
Deferred income taxes (12,514) (24,819)
Loss (gain) in equity investment 1,008 (7,633)
Changes in assets and liabilities    
Accounts receivable and unbilled costs 33,838 73,697
Inventories and deferred costs 32 (3,213)
Prepaid expenses and other assets (3,505) (4,697)
Accounts payable (3,455) (516)
Accrued compensation and other expenses 2,084 (6,264)
Operating lease liabilities (5,626) (5,915)
Income taxes payable 558 194
Deferred revenue (21,699) (52,584)
Net cash provided by operating activities 80,206 34,699
Cash flows from investing activities:    
Purchase of marketable securities and investments (50,589) (20,999)
Proceeds from sales and maturity of marketable securities 30,362 25,290
Proceeds from sale of equity investment 11,772 0
Purchase of fixed assets (4,111) (2,150)
Purchase of intangible assets 0 (1,290)
Net cash (used in) provided by investing activities (12,566) 851
Cash flows from financing activities:    
Issuance of common stock under stock plans 2 2
Treasury stock repurchases (31,565) (25,257)
Tax withholding on restricted stock units (15,197) (13,499)
Repayment of long-term debt 0 (25,000)
Net cash used in financing activities (46,760) (63,754)
Effect of exchange rate changes on cash and cash equivalents 5,085 1,885
Net increase (decrease) in cash and cash equivalents 25,965 (26,319)
Cash and cash equivalents, beginning of period 457,415 389,674
Cash and cash equivalents, end of period 483,380 363,355
Supplemental disclosures:    
Cash paid for interest 0 2,693
Cash paid for income taxes 20,047 22,176
Non-cash transactions:    
Transfers of inventory to fixed assets 613 1,020
Additions to property, plant and equipment included in accounts payable 68 86
Issuance of common stock under employee stock plans $ 5,388 $ 4,577