Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2021	Mar. 31, 2021
Current assets:
Cash and cash equivalents	$ 175,454	$ 232,710
Short-term marketable securities	347,577	350,985
Accounts receivable, net	88,645	97,179
Inventories	83,661	81,059
Prepaid expenses and other current assets	34,536	26,032
Total current assets	729,873	787,965
Long-term marketable securities	281,776	264,085
Property and equipment, net	198,234	197,129
Goodwill	79,006	78,568
Other intangibles, net	41,904	42,150
Deferred tax assets	4,958	11,380
Other assets	122,643	113,082
Total assets	1,458,394	1,494,359
Current liabilities:
Accounts payable	29,807	34,842
Accrued expenses	56,462	66,046
Deferred revenue	24,094	24,322
Other current liabilities	2,760	3,759
Total current liabilities	113,123	128,969
Other long-term liabilities	11,314	10,162
Contingent consideration	25,577	24,706
Deferred tax liabilities	858	847
Total liabilities	150,872	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 - 47,435,945 shares at June 30, 2019 and 47,026,226 shares at March 31, 2019 Outstanding - 45,374,278 shares at June 30, 2019 and 45,122,985 shares at March 31, 2019	454	453
Additional paid in capital	815,416	800,690
Retained earnings	801,482	828,007
Treasury stock at cost 2,692,728 shares as of June 30, 2021 and 2,658,454 shares as of March 31, 2021	(297,619)	(288,030)
Accumulated other comprehensive loss	(12,211)	(11,445)
Total stockholders' equity	1,307,522	1,329,675
Total liabilities and stockholders' equity	$ 1,458,394	$ 1,494,359