Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Cash flows from operating activities:
Net income (loss)	$ 7,915	$ (10,090)
Adjustments to reconcile net income (loss) to cash provided by operating activities, net of the effects of acquisitions:
Depreciation and amortization	79,638	87,397
Operating lease right-of-use assets	7,820	7,872
Loss on disposal of fixed assets	37	16
Share-based compensation expense	40,349	39,961
Net change in fair value of contingent and contractual liabilities	0	541
Accretion of contingent consideration	0	(24)
Deferred income taxes	(10,438)	(8,480)
Other (gains) losses	(1)	35
Changes in assets and liabilities
Accounts receivable and unbilled costs	6,722	(9,554)
Inventories	(5,083)	(1,233)
Prepaid expenses and other assets	2,321	10,957
Accounts payable	(589)	(4,647)
Accrued compensation and other expenses	22,694	16,009
Operating lease liabilities	(7,923)	(9,690)
Income taxes payable	190	24
Deferred revenue	(21,749)	(1,304)
Net cash provided by operating activities	121,903	117,790
Cash flows from investing activities:
Purchase of marketable securities	(13,974)	(89,840)
Proceeds from sales and maturity of marketable securities	51,706	108,413
Purchase of fixed assets	(9,110)	(15,207)
Purchase of intangible assets	(4,537)	0
Decrease (increase) in deposits	105
Decrease (increase) in deposits		(29)
Acquisition of businesses	0	(4,154)
Net cash provided by (used in) investing activities	24,190	(817)
Cash flows from financing activities:
Issuance of common stock under stock plans	2	2
Payment of contingent consideration	(1,000)	0
Repayment of long-term debt	0	(100,000)
Treasury stock repurchases	(3,275)	(125,000)
Tax withholding on restricted stock units	(12,768)	(11,612)
Net cash used in financing activities	(17,041)	(236,610)
Effect of exchange rate changes on cash and cash equivalents	9,214	(1,523)
Net increase (decrease) in cash and cash equivalents and restricted cash	138,266	(121,160)
Cash and cash equivalents and restricted cash, beginning of period	340,237	409,820
Cash and cash equivalents and restricted cash, end of period	478,503	288,660
Supplemental disclosures:
Cash paid for interest	6,103	14,019
Cash paid for income taxes	8,532	10,494
Non-cash transactions:
Transfers of inventory to fixed assets	1,530	2,290
Additions to property, plant and equipment included in accounts payable	231	119
Issuance of common stock under employee stock plans	6,475	6,593
Contingent consideration related to acquisition, included in accrued other	$ 0	$ 1,000