Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
Feb. 28, 2015	Mar. 01, 2014	Mar. 02, 2013
Operating Activities
Net earnings	$ 50,516us-gaap_NetIncomeLoss	$ 27,986us-gaap_NetIncomeLoss	$ 19,111us-gaap_NetIncomeLoss
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	29,423	26,550	26,529
Stock-based compensation	4,793us-gaap_ShareBasedCompensation	4,661us-gaap_ShareBasedCompensation	4,395us-gaap_ShareBasedCompensation
Deferred income taxes	4,274us-gaap_DeferredIncomeTaxExpenseBenefit	(5,280)us-gaap_DeferredIncomeTaxExpenseBenefit	3,557us-gaap_DeferredIncomeTaxExpenseBenefit
Excess tax benefits from stock-based compensation	(3,236)	(2,725)	(483)
Gain on disposal of assets	(933)	(1,629)	(1,954)
Proceeds from new markets tax credit transaction, net of deferred costs	0	7,471	0
Other, net	229us-gaap_OtherNoncashIncomeExpense	51us-gaap_OtherNoncashIncomeExpense	1,156us-gaap_OtherNoncashIncomeExpense
Changes in operating assets and liabilities:
Receivables	(18,588)us-gaap_IncreaseDecreaseInReceivables	(19,229)us-gaap_IncreaseDecreaseInReceivables	(13,364)us-gaap_IncreaseDecreaseInReceivables
Inventories	(8,660)us-gaap_IncreaseDecreaseInInventories	(6,130)us-gaap_IncreaseDecreaseInInventories	(2,209)us-gaap_IncreaseDecreaseInInventories
Accounts payable and accrued expenses	12,871	18,282	11,158
Billings in excess of costs and earnings on uncompleted contracts	(324)	1,202	(1,195)
Refundable and accrued income taxes	(1,091)	3,449	(4,086)
Other, net	(711)	(1,738)	(2,092)
Net cash provided by operating activities	68,563	52,921	40,523
Investing Activities
Capital expenditures	(27,220)	(41,852)	(34,664)
Proceeds from sales of property, plant and equipment	273	806	1,078
Payments to Acquire Businesses, Net of Cash Acquired	0	(53,301)	(15)
Purchases of restricted investments	0	(36,200)	(10,000)
Sales/maturities of restricted investments	2,532	60,115	5,472
Purchases of marketable securities	(6,142)	(14,562)	(58,847)
Sales/maturities of marketable securities	6,946	41,020	41,295
Investments in corporate-owned life insurance policies	(864)	0	(1,451)
Net cash used in investing activities	(24,475)	(43,974)	(57,132)
Financing Activities
Proceeds from (Repayments of) Lines of Credit	126	0	0
Proceeds from issuance of debt	0	0	10,000
Payments on debt	(50)us-gaap_RepaymentsOfLongTermDebt	(10,082)us-gaap_RepaymentsOfLongTermDebt	(164)us-gaap_RepaymentsOfLongTermDebt
Payments on debt issue costs	(215)us-gaap_PaymentsOfDebtIssuanceCosts	(165)us-gaap_PaymentsOfDebtIssuanceCosts	(633)us-gaap_PaymentsOfDebtIssuanceCosts
Shares withheld for taxes, net of stock issued to employees	(3,905)	710	862
Excess tax benefits from stock-based compensation	3,236	2,725	483
Repurchase and retirement of common stock	(6,894)	0	0
Dividends paid	(12,071)us-gaap_PaymentsOfDividendsCommonStock	(10,764)us-gaap_PaymentsOfDividendsCommonStock	(10,316)us-gaap_PaymentsOfDividendsCommonStock
Net cash (used in) provided by financing activities	(19,773)	(17,576)	232
Increase (decrease) in cash and cash equivalents	24,315	(8,629)	(16,377)
Effect of exchange rates on cash	(595)	(673)	117
Cash and cash equivalents at beginning of year	28,465	37,767	54,027
Cash and cash equivalents at end of period	52,185	28,465	37,767
Noncash Activity
Capital expenditures in accounts payable	$ 2,656	$ 761	$ 553

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Balance Type:	credit
Period Type:	duration

- Definition

The cash outflow for payments to purchase life insurance policies for which the entity is the beneficiary.

+ References

+ Details

Name:	us-gaap_PaymentsToAcquireLifeInsurancePolicies
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

+ References

+ Details

Name:	us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash outflow to acquire investments (not to include restricted cash) that are pledged or subject to withdrawal restrictions.

+ References

+ Details

Name:	us-gaap_PaymentsToAcquireRestrictedInvestments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The net cash inflow or cash outflow from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with either short term or long term maturity that is collateralized (backed by pledge, mortgage or other lien in the entity's assets).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 9

-Subparagraph c

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3098-108585

+ Details

Name:	us-gaap_ProceedsFromRepaymentsOfLinesOfCredit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash inflow associated with the sale of debt securities classified as available-for-sale securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 11

-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

+ Details

Name:	us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

+ References

+ Details

Name:	us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash inflow associated with the sale of investments that are pledged or subject to withdrawal restrictions during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

+ Details

Name:	us-gaap_ProceedsFromSaleOfRestrictedInvestments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

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Name:	us-gaap_ShareBasedCompensation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration