v2.3.0.11

Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Aug. 28, 2011	Aug. 29, 2010	Aug. 28, 2011	Aug. 29, 2010	Nov. 30, 2010
Segment Reporting Information [Line Items]
Sales	$ 146,468	$ 134,199	$ 391,013	$ 379,761
Income/(loss) before interest, income taxes and equity in loss of affiliate	2,490	10,662	(1,041)	25,550
Assets	749,192		749,192		781,569
Operating Segments [Member]
Segment Reporting Information [Line Items]
Number of segments			4
Reportable Segment [Member]
Segment Reporting Information [Line Items]
Number of segments			3
Fiberglass-Composite Pipe [Member]
Segment Reporting Information [Line Items]
Sales	71,303	60,128	196,045	179,302
Income/(loss) before interest, income taxes and equity in loss of affiliate	11,777	14,784	35,841	46,614
Assets	312,918		312,918		335,135
Water Transmission [Member]
Segment Reporting Information [Line Items]
Sales	41,409	41,432	105,423	108,532
Income/(loss) before interest, income taxes and equity in loss of affiliate	(3,160)	2,121	(11,136)	491
Assets	191,902		191,902		182,576
Infrastructure Products [Member]
Segment Reporting Information [Line Items]
Number of segments			2
Sales	33,757	32,615	89,550	91,933
Income/(loss) before interest, income taxes and equity in loss of affiliate	4,160	3,436	4,944	7,020
Assets	102,464		102,464		92,729
Corporate and unallocated [Member]
Segment Reporting Information [Line Items]
Income/(loss) before interest, income taxes and equity in loss of affiliate	(10,287)	(9,679)	(30,690)	(28,575)
Assets	292,969		292,969		343,070
Eliminations [Member]
Segment Reporting Information [Line Items]
Sales	(1)	24	(5)	(6)
Assets	$ (151,061)		$ (151,061)		$ (171,941)

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Number of Segments

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 7
-Section 03
-Paragraph 12

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Topic 210
-SubTopic 10
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682
-Section S99
-Name Accounting Standards Codification
-Publisher FASB
-Paragraph 1

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Concepts (CON)
-Number 6
-Paragraph 25
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 18
-Article 5

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.18)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Aggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 5
-Section 03
-Paragraph 1

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1(a))
-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688

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