Consolidated Balance Sheets (unaudited) (USD $) In Thousands, unless otherwise specified	Dec. 01, 2012	Mar. 03, 2012
Current assets
Cash and cash equivalents	$ 37,418	$ 54,027
Short-term marketable securities available for sale	25,154	11,664
Restricted short-term investments	12,392	13,603
Receivables, net of allowance for doubtful accounts	127,361	108,424
Inventories	42,538	34,045
Deferred tax assets	4,022	4,294
Other current assets	4,346	3,382
Total current assets	253,231	229,439
Property, plant and equipment, net	162,358	159,547
Marketable securities available for sale	10,356	7,936
Restricted investments	14,290	9,533
Goodwill	61,375	61,617
Intangible assets	14,281	16,092
Other assets	7,790	8,940
Total assets	523,681	493,104
Current liabilities
Accounts payable	39,310	34,025
Accrued payroll and related benefits	23,977	23,699
Accrued self-insurance reserves	5,507	4,668
Other accrued expenses	22,521	19,017
Current liabilities of discontinued operations	345	799
Billings in excess of costs and earnings on uncompleted contracts	26,262	22,550
Current portion long-term debt	83	108
Accrued income taxes	389	905
Total current liabilities	118,394	105,771
Long-term debt	30,775	20,916
Unrecognized tax benefits	7,338	8,918
Long-term self-insurance reserves	7,627	9,605
Deferred tax liabilities	2,696	2,247
Other long-term liabilities	26,224	23,929
Liabilities of discontinued operations	485	520
Commitments and contingent liabilities (Note 13)
Shareholders' equity
Common stock of $0.33-1/3 par value; authorized 50,000,000 shares; issued and outstanding 28,437,410 and 28,062,049, respectively	9,479	9,354
Additional paid-in capital	117,679	113,046
Retained earnings	209,379	203,558
Common stock held in trust	(767)	(745)
Deferred compensation obligations	767	745
Accumulated other comprehensive loss	(6,395)	(4,760)
Total shareholders’ equity	330,142	321,198
Total liabilities and shareholders' equity	$ 523,681	$ 493,104