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Earnings Per Share (Tables) | 12 Months Ended
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Sep. 30, 2012
Earnings Per Share [Abstract] |
Computation Of Basic And Diluted Earnings Per Share |
| Year Ended September 30,
| 2012 | 2011 | 2010
Numerator: |  |  |
Net income (loss) attributable to Powell Industries, Inc. | $ 29,657 | $ (2,715) | $ 25,008
Denominator: |  |  |
Weighted average basic shares | 11,850 | 11,735 | 11,545
Dilutive effect of stock options, restricted stock and restricted stock units (1) | 75 | — | 148
Weighted average diluted shares with assumed conversions | 11,925 | 11,735 | 11,693
Net earnings (loss) per share: |  |  |
Basic | $ 2.50 | $ (0.23) | $ 2.17
Diluted | $ 2.49 | $ (0.23) | $ 2.14
(1) In fiscal year 2011, these items were excluded from diluted income (loss) per share as the effect would have been anti-dilutive.

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- Definition Tabular disclosure of the numerators and the denominators of the basic and diluted per-share (or per-unit) computations for income from continuing operations, including the effect that has been given to preferred dividends. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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