Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Feb. 28, 2018	Feb. 28, 2017	Feb. 29, 2016
Cash Flows From Operating Activities:
Net Income	$ 45,169	$ 61,264	$ 75,544
Adjustments To Reconcile Net Income To Net Cash Provided By Operating Activities:
Depreciation	33,400	33,400	31,200
Depreciation, Amortization and Accretion, Net	50,526	50,357	47,417
Deferred income tax expense	(20,637)	1,714	1,960
Share-based compensation expense	6,121	5,870	4,538
Amortization of deferred debt issuance costs	595	1,262	1,347
Provision for doubtful accounts	3,007	48	(1,072)
Gain (Loss) on Disposition of Assets	10,834	6,602	286
Net (gain) loss on insurance settlement or sale of property, plant and equipment	765	76	(327)
Effects of changes in operating assets and liabilities, net of acquisitions:
Accounts Receivable	3,492	(4,912)	(843)
Inventories	(9,927)	(13,754)	(2,052)
Prepaid expenses and other assets	(2,376)	(1,977)	1,996
Net change in billings related to costs and estimated earnings on uncompleted contracts	984	13,592	7,276
Accounts payable	1,540	1,245	(2,236)
Other accrued liabilities and income taxes payable	(11,184)	(10,211)	9,755
Net cash provided by operating activities:	78,909	111,176	143,589
Cash flows from investing activities:
Proceeds from the sale or insurance settlement of property, plant, and equipment	458	769	1,137
Acquisition of subsidiaries, net of cash acquired	(44,785)	(22,679)	(60,584)
Purchases of property, plant and equipment	(29,612)	(41,434)	(39,861)
Net cash used in investing activities:	(73,939)	(63,344)	(99,308)
Cash flows from financing activities:
Tax benefits from stock options exercised	0	0	1,025
Payments on revolving loan	(256,500)	(211,000)	(170,561)
Proceeds from Lines of Credit	349,000	179,500	181,481
Proceeds from long-term debt	(63,504)	(23,192)	(21,786)
Cash dividends paid	(17,678)	(16,645)	(15,482)
Net cash provided by (used in) financing activities	3,800	(76,619)	(25,323)
Payments for Repurchase of Common Stock	7,518	5,282	0
Effect of exchange rate changes on cash	781	(102)	(1,294)
Net increase (decrease) in cash and cash equivalents	9,551	(28,889)	17,664
Cash and cash equivalents at beginning of year	11,302	40,191	22,527
Cash and cash equivalents at end of year	20,853	11,302	40,191
Cash paid during the year for:
Interest	13,593	13,780	14,228
Income taxes	$ 8,701	$ 19,857	$ 21,574