Working Capital (Schedule of Receivables) (Details) (USD $) In Thousands, unless otherwise specified	Feb. 28, 2015	Mar. 01, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total receivables	$ 174,865us-gaap_AccountsReceivableGrossCurrent	$ 157,848us-gaap_AccountsReceivableGrossCurrent
Less allowance for doubtful accounts	(3,242)	(2,934)
Net receivables	171,623us-gaap_AccountsReceivableNetCurrent	154,914us-gaap_AccountsReceivableNetCurrent
Trade accounts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total receivables	111,494	98,246
Construction contracts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total receivables	33,582	39,257
Contract retainage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total receivables	24,547	19,040
Other receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total receivables	$ 5,242	$ 1,305

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Amounts due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer) for goods or services (including trade receivables) that have been delivered or sold in the normal course of business.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.3)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 3

-Subparagraph a, b

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- Definition

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+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.3-4)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 3

-Subparagraph a(1)

-Article 5

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 4

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- Definition

A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 4

-Article 5

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5074-111524

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

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-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.4)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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