CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands	Jun. 30, 2011	Mar. 31, 2011
Current assets:
Cash and cash equivalents	$ 48,924	$ 60,144
Restricted cash	12,075	20,398
Short-term investments, at fair value	148,073	110,141
Accounts receivable, net of allowances of $308 and $334 at June 30, 2011 and March 31, 2011, respectively	27,494	37,180
Unbilled costs and fees	21,203	17,082
Inventories, net	48,683	46,922
Prepaid expenses and other current assets	9,202	6,698
Deferred income taxes	3,821	3,469
Total current assets	319,475	302,034
Building, equipment and leasehold improvements, net	19,121	18,559
Restricted cash	2,000	9,062
Deferred income taxes	5,961	6,779
Other assets, net	118	140
Total assets	346,675	336,574
Current liabilities:
Accounts payable	8,895	9,378
Accrued salaries and benefits	7,924	15,988
Accrued warranty costs	1,114	1,225
Accrued income taxes	2,489	1,936
Deferred revenue	20,183	16,924
Customer deposits	18,041	9,193
Current portion of lease financing liability	1,325	1,321
Other current liabilities	5,109	5,460
Total current liabilities	65,080	61,425
Lease financing liability, net of current portion	5,421	5,755
Deferred revenue	3,475	3,288
Other long term liabilities	26	26
Total liabilities	74,002	70,494
Stockholders' equity:
Preferred stock, no par value, 100,000 shares authorized; no shares issued
Common stock, $0.66 2/3 par value, 20,000,000 shares authorized 9,224,452 and 9,169,965 shares issued and outstanding at June 30, 2011 and March 31, 2011, respectively	6,149	6,113
Capital in excess of par value	113,731	110,087
Accumulated other comprehensive income, net	1	21
Retained earnings	152,792	149,859
Total stockholders' equity	272,673	266,080
Total liabilities and stockholders' equity	$ 346,675	$ 336,574