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Inventories (Tables) | 3 Months Ended
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May 31, 2012
Inventories [Abstract] |
Schedule Of Inventories |
|  | May 31, |  | May 31, |  | August 31, |
$ in thousands |  | 2012 |  | 2011 |  | 2011 |
Inventory: |  |  |  |  |  |  |  |  |  |
FIFO inventory |  | $ | 29,296 |  | $ | 25,720 |  | $ | 22,614 |
LIFO reserves |  |  | (6,996) |  |  | (6,874) |  |  | (7,178) |
LIFO inventory |  |  | 22,300 |  |  | 18,846 |  |  | 15,436 |
Weighted average inventory |  |  | 21,465 |  |  | 21,743 |  |  | 20,848 |
Other FIFO inventory |  |  | 20,359 |  |  | 14,434 |  |  | 15,407 |
Obsolescence reserve |  |  | (2,005) |  |  | (2,190) |  |  | (2,167) |
Total inventories |  | $ | 62,119 |  | $ | 52,833 |  | $ | 49,524 |
Schedule Of Estimated Percentage Distribution |
|  | May 31, |  | May 31, |  | August 31, |
|  | 2012 |  | 2011 |  | 2011 |
Raw materials |  |  | 15% |  |  | 14% |  |  | 14% |
Work in process |  |  | 9% |  |  | 9% |  |  | 8% |
Finished goods and purchased parts |  |  | 76% |  |  | 77% |  |  | 78% |

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- Definition Percentage Distribution Between Major Classes Of Inventory [Text Block] + References No definition available. + Details
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- Definition Tabular disclosure of the carrying amount as of the balance sheet date of merchandise, goods, commodities, or supplies held for future sale or to be used in manufacturing, servicing or production process. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 2 -Paragraph 6 -Subparagraph a,b,c -Article 5 + Details
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