Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Cash flows from operating activities:
Net income	$ 44,280	$ 7,915
Adjustments to reconcile net income to cash provided by operating activities, net of the effects of acquisitions:
Depreciation and amortization	72,047	79,638
Loss on extinguishment of debt	596	0
Operating lease right-of-use assets	7,589	7,820
Loss on disposal of fixed assets	2	37
Share-based compensation expense	43,381	40,349
Change in fair value of contingent consideration	(837)	0
Deferred income taxes	(11,093)	(10,438)
Other gains	(21)	(1)
Changes in assets and liabilities
Accounts receivable and unbilled costs	(36,211)	6,722
Inventories	(1,265)	(5,083)
Prepaid expenses and other assets	(1,031)	2,321
Accounts payable	844	(589)
Accrued compensation and other expenses	(13,438)	22,694
Operating lease liabilities	(8,855)	(7,923)
Income taxes payable	(1,861)	190
Deferred revenue	46,260	(21,749)
Net cash provided by operating activities	140,387	121,903
Cash flows from investing activities:
Purchase of marketable securities	(11,343)	(13,974)
Proceeds from sales and maturity of marketable securities	15,264	51,706
Purchase of fixed assets	(7,004)	(9,110)
Purchase of intangible assets	0	(4,537)
Decrease in deposits	28	105
Net cash (used in) provided by investing activities	(3,055)	24,190
Cash flows from financing activities:
Issuance of common stock under stock plans	2	2
Payment of contingent consideration	0	(1,000)
Treasury stock repurchases	(35,652)	(3,275)
Tax withholding on restricted stock units	(15,246)	(12,768)
Payment of debt issuance costs	(3,660)	0
Repayment of long-term debt	(350,000)	0
Proceeds from issuance of long-term debt	350,000	0
Collection of contingent consideration	837	0
Net cash used in financing activities	(53,719)	(17,041)
Effect of exchange rate changes on cash and cash equivalents	(2,684)	9,214
Net increase in cash and cash equivalents and restricted cash	80,929	138,266
Cash and cash equivalents and restricted cash, beginning of period	467,176	340,237
Cash and cash equivalents and restricted cash, end of period	548,105	478,503
Supplemental disclosures:
Cash paid for interest	3,716	6,103
Cash paid for income taxes	24,677	8,532
Non-cash transactions:
Transfers of inventory to fixed assets	2,657	1,530
Additions to property, plant and equipment included in accounts payable	361	231
Issuance of common stock under employee stock plans	$ 6,890	$ 6,475