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Quarterly Financial Information (Unaudited) (Error Corrections And Prior Period Adjustments) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
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Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2013
Cost of sales |  |  |  |  |  |  |  |  | $ 334,850 | $ 323,939 | $ 295,863
Earnings before income taxes |  |  |  |  |  |  |  |  | 61,521 | 62,207 | 49,595
Income tax expense |  |  |  |  |  |  |  |  | 19,785 | 19,594 | 18,335
Net earnings from continuing operations | $ 12,983 | $ 10,748 | $ 7,982 | $ 10,023 | $ 12,927 | $ 11,590 | $ 9,264 | $ 8,832 | $ 41,736 | $ 42,613 | $ 31,260
Diluted net earnings per share | $ 0.50 | $ 0.45 | $ 0.29 | $ 0.38 | $ 0.43 | $ 0.43 | $ (1.26) | $ 0.42 | $ 1.62 | $ 0.02 | $ (0.96)
Scenario, Previously Reported [Member] |  |  |  |  |  |  |  |  |  |  |
Cost of sales |  |  | $ 80,140 | $ 70,420 |  |  |  |  |  |  |
Earnings before income taxes |  |  | 13,791 | 14,776 |  |  |  |  |  |  |
Income tax expense |  |  | 5,144 | 3,948 |  |  |  |  |  |  |
Net earnings from continuing operations |  |  | $ 8,647 | $ 10,828 |  |  |  |  |  |  |
Diluted net earnings per share |  |  | $ 0.32 | $ 0.41 |  |  |  |  |  |  |
Restatement Adjustment [Member] |  |  |  |  |  |  |  |  |  |  |
Cost of sales |  |  | $ 81,142 | $ 71,621 |  |  |  |  |  |  |
Earnings before income taxes |  |  | 12,789 | 13,575 |  |  |  |  |  |  |
Income tax expense |  |  | 4,807 | 3,552 |  |  |  |  |  |  |
Net earnings from continuing operations |  |  | $ 7,982 | $ 10,023 |  |  |  |  |  |  |
Diluted net earnings per share |  |  | $ 0.29 | $ 0.38 |  |  |  |  |  |  |

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- Definition The aggregate cost of goods produced and sold and services rendered during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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