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Supplemental Quarterly Financial Data (Unaudited) (Tables) | 12 Months Ended
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Sep. 30, 2015
Segment Reporting [Member] |
Quarterly Financial Information |
| 2015 Fiscal Quarters
| First |  | Second |  | Third |  | Fourth
Segment external net sales: |  |  |  |  |  |  |  |  |  |  |
Aerospace | $ | 255,770 |  | $ | 281,426 |  | $ | 288,480 |  | $ | 335,207
Energy |  | 231,876 |  |  | 211,796 |  |  | 206,330 |  |  | 227,418
Total | $ | 487,646 |  | $ | 493,222 |  | $ | 494,810 |  | $ | 562,625
Segment earnings: |  |  |  |  |  |  |  |  |  |  |
Aerospace | $ | 35,793 |  | $ | 45,628 |  | $ | 46,362 |  | $ | 59,964
Energy |  | 39,268 |  |  | 27,224 |  |  | 30,619 |  |  | 29,530
Total | $ | 75,061 |  | $ | 72,852 |  | $ | 76,981 |  | $ | 89,494
Earnings reconciliation: |  |  |  |  |  |  |  |  |  |  |
Total segment earnings | $ | 75,061 |  | $ | 72,852 |  | $ | 76,981 |  | $ | 89,494
Nonsegment expenses |  | (12,167) |  |  | (10,153) |  |  | (13,564) |  |  | (13,478)
Interest expense, net |  | (5,822) |  |  | (5,108) |  |  | (5,858) |  |  | (7,289)
Consolidated earnings before income taxes | $ | 57,072 |  | $ | 57,591 |  | $ | 57,559 |  | $ | 68,727
| 2014 Fiscal Quarters
| First |  | Second |  | Third |  | Fourth
Segment external net sales: |  |  |  |  |  |  |  |  |  |  |
Aerospace | $ | 229,872 |  | $ | 261,021 |  | $ | 274,923 |  | $ | 318,209
Energy |  | 199,170 |  |  | 221,446 |  |  | 249,361 |  |  | 247,238
Total | $ | 429,042 |  | $ | 482,467 |  | $ | 524,284 |  | $ | 565,447
Segment earnings: |  |  |  |  |  |  |  |  |  |  |
Aerospace | $ | 22,549 |  | $ | 40,289 |  | $ | 39,357 |  | $ | 57,005
Energy |  | 27,071 |  |  | 31,888 |  |  | 40,203 |  |  | 35,116
Total | $ | 49,620 |  | $ | 72,177 |  | $ | 79,560 |  | $ | 92,121
Earnings reconciliation: |  |  |  |  |  |  |  |  |  |  |
Total segment earnings | $ | 49,620 |  | $ | 72,177 |  | $ | 79,560 |  | $ | 92,121
Nonsegment expenses |  | (10,673) |  |  | (9,293) |  |  | (11,193) |  |  | (12,542)
Interest expense, net |  | (6,003) |  |  | (6,128) |  |  | (5,899) |  |  | (4,503)
Consolidated earnings before income taxes | $ | 32,944 |  | $ | 56,756 |  | $ | 62,468 |  | $ | 75,076
Total of Reporting Segments [Member] |
Quarterly Financial Information |
| 2015 Fiscal Quarters
| First |  | Second |  | Third |  | Fourth
Net sales | $ | 487,646 |  | $ | 493,222 |  | $ | 494,810 |  | $ | 562,625
Gross margin (1) |  | 143,886 |  |  | 137,620 |  |  | 143,389 |  |  | 159,690
Earnings before income taxes |  | 57,072 |  |  | 57,591 |  |  | 57,559 |  |  | 68,727
Net earnings |  | 43,784 |  |  | 43,855 |  |  | 43,753 |  |  | 50,060
Earnings per share |  |  |  |  |  |  |  |  |  |  |
Basic earnings per share |  | 0.67 |  |  | 0.67 |  |  | 0.68 |  |  | 0.79
Diluted earnings per share |  | 0.66 |  |  | 0.66 |  |  | 0.66 |  |  | 0.77
Cash dividends per share |  | 0.08 |  |  | 0.10 |  |  | 0.10 |  |  | 0.10
| 2014 Fiscal Quarters
| First |  | Second |  | Third |  | Fourth
Net sales | $ | 429,042 |  | $ | 482,467 |  | $ | 524,284 |  | $ | 565,447
Gross margin (1) |  | 113,576 |  |  | 142,439 |  |  | 151,713 |  |  | 167,673
Earnings before income taxes |  | 32,944 |  |  | 56,756 |  |  | 62,468 |  |  | 75,076
Net earnings |  | 23,383 |  |  | 44,798 |  |  | 46,001 |  |  | 51,662
Earnings per share |  |  |  |  |  |  |  |  |  |  |
Basic earnings per share |  | 0.35 |  |  | 0.67 |  |  | 0.70 |  |  | 0.79
Diluted earnings per share |  | 0.34 |  |  | 0.66 |  |  | 0.69 |  |  | 0.77
Cash dividends per share |  | 0.08 |  |  | 0.08 |  |  | 0.08 |  |  | 0.08

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- Definition Tabular disclosure of the quarterly financial data in the annual financial statements. The disclosure includes financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income (loss) before extraordinary items and cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=51825399&loc=d3e1280-108306 + Details
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