| Schedule of Segment Reporting Information, by Segment [Table Text Block] |
Following is information related to each reportable segment included in, and in a manner consistent with, internal management reports: | | | | | | | | | | | | | | | | | | | | Three Months Ended | | Nine Months Ended | (In thousands) | | August 28,
2011 | | August 29,
2010 | | August 28,
2011 | | August 29,
2010 | Sales | | | | | | | | | Fiberglass-Composite Pipe | | $ | 71,303 |
| | $ | 60,128 |
| | $ | 196,045 |
| | $ | 179,302 |
| Water Transmission | | 41,409 |
| | 41,432 |
| | 105,423 |
| | 108,532 |
| Infrastructure Products | | 33,757 |
| | 32,615 |
| | 89,550 |
| | 91,933 |
| Eliminations | | (1 | ) | | 24 |
| | (5 | ) | | (6 | ) | Total Sales | | $ | 146,468 |
| | $ | 134,199 |
| | $ | 391,013 |
| | $ | 379,761 |
| | | | | | | | | | Income/(Loss) Before Interest, Income Taxes and Equity in Loss of Affiliate | | | | | | | | | Fiberglass-Composite Pipe | | $ | 11,777 |
| | $ | 14,784 |
| | $ | 35,841 |
| | $ | 46,614 |
| Water Transmission | | (3,160 | ) | | 2,121 |
| | (11,136 | ) | | 491 |
| Infrastructure Products | | 4,160 |
| | 3,436 |
| | 4,944 |
| | 7,020 |
| Corporate and unallocated | | (10,287 | ) | | (9,679 | ) | | (30,690 | ) | | (28,575 | ) | Total Income/(Loss) Before Interest, Income Taxes and Equity in Loss of Affiliate | | $ | 2,490 |
| | $ | 10,662 |
| | $ | (1,041 | ) | | $ | 25,550 |
|
| | | | | | | | | | (In thousands) | | August 28,
2011 | | November 30,
2010 | Assets | | | | | Fiberglass-Composite Pipe | | $ | 312,918 |
| | $ | 335,135 |
| Water Transmission | | 191,902 |
| | 182,576 |
| Infrastructure Products | | 102,464 |
| | 92,729 |
| Corporate and unallocated | | 292,969 |
| | 343,070 |
| Eliminations | | (151,061 | ) | | (171,941 | ) | Total Assets | | $ | 749,192 |
| | $ | 781,569 |
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