Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Dec. 31, 2021	Mar. 31, 2021
Current assets:
Cash and cash equivalents	$ 144,255	$ 232,710
Short-term marketable securities	524,966	350,985
Accounts receivable, net	88,952	97,179
Inventories, net	90,199	81,059
Prepaid expenses and other current assets	36,634	26,032
Total current assets	885,006	787,965
Long-term marketable securities	262,635	264,085
Property and equipment, net	196,880	197,129
Goodwill	77,449	78,568
Other intangibles, net	40,278	42,150
Deferred tax assets	3,680	11,380
Other assets	126,949	113,082
Total assets	1,592,877	1,494,359
Current liabilities:
Accounts payable	32,066	34,842
Accrued expenses	66,668	66,046
Deferred revenue	24,867	24,322
Other current liabilities	3,195	3,759
Total current liabilities	126,796	128,969
Other long-term liabilities	10,805	10,162
Contingent consideration	21,539	24,706
Deferred tax liabilities	799	847
Total liabilities	159,939	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	853,210	800,690
Retained earnings	904,187	828,007
Treasury stock at cost - 2,713 and 2,658 shares as of December 31, 2021 and March 31, 2021, respectively	(304,425)	(288,030)
Accumulated other comprehensive loss	(20,489)	(11,445)
Total stockholders' equity	1,432,938	1,329,675
Total liabilities and stockholders' equity	$ 1,592,877	$ 1,494,359