Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2021	Mar. 31, 2021
Current assets:
Cash and cash equivalents	$ 241,882	$ 232,710
Short-term marketable securities	408,677	350,985
Accounts receivable, net	89,568	97,179
Inventories, net	85,986	81,059
Prepaid expenses and other current assets	45,374	26,032
Total current assets	871,487	787,965
Long-term marketable securities	210,979	264,085
Property and equipment, net	197,184	197,129
Goodwill	78,166	78,568
Other intangibles, net	41,062	42,150
Deferred tax assets	2,975	11,380
Other assets	128,181	113,082
Total assets	1,530,034	1,494,359
Current liabilities:
Accounts payable	27,621	34,842
Accrued expenses	56,744	66,046
Deferred revenue	24,078	24,322
Other current liabilities	5,579	3,759
Total current liabilities	114,022	128,969
Other long-term liabilities	8,303	10,162
Contingent consideration	22,314	24,706
Deferred tax liabilities	832	847
Total liabilities	145,471	164,684
Commitments and contingencies (Note 16)
Stockholders' equity:
Class B Preferred Stock, $.01 par value Authorized - 1,000,000 shares; Issued and outstanding - none
Common stock, $.01 par value Authorized - 100,000,000 shares; Issued 48,197,044 shares as of September 30, 2021 and 47,929,402 shares as of March 31, 2021 Outstanding 45,496,563 shares as of September 30, 2021 and 45,270,948 shares as of March 31, 2021	455	453
Additional paid in capital	840,387	800,690
Retained earnings	858,435	828,007
Treasury stock at cost 2,700,481 shares as of September 30, 2021 and 2,658,454 shares as of March 31, 2021	(300,158)	(288,030)
Accumulated other comprehensive loss	(14,556)	(11,445)
Total stockholders' equity	1,384,563	1,329,675
Total liabilities and stockholders' equity	$ 1,530,034	$ 1,494,359