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Earnings Per Share | 12 Months Ended
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Sep. 30, 2011
Earnings Per Share [Abstract] |
Earnings Per Share | F. Earnings Per Share The following table sets forth the computation of basic and diluted earnings per share (in thousands, except per share data):
|  | Year Ended September 30, |
|  | 2011 |  |  | 2010 |  |  | 2009 |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) attributable to Powell Industries, Inc. |  | $ | (2,715 | ) |  | $ | 25,008 |  |  | $ | 39,717 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |
Weighted average basic shares |  |  | 11,735 |  |  |  | 11,545 |  |  |  | 11,424 |
Dilutive effect of stock options, restricted stock and restricted stock units (1) |  |  | — |  |  |  | 148 |  |  |  | 167 |
Weighted average diluted shares with assumed conversions |  |  | 11,735 |  |  |  | 11,693 |  |  |  | 11,591 |
Net earnings (loss) per share: |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | (0.23 | ) |  | $ | 2.17 |  |  | $ | 3.48 |
Diluted |  | $ | (0.23 | ) |  | $ | 2.14 |  |  | $ | 3.43 |
(1) | In fiscal year 2011, these items were excluded from diluted income (loss) per share as the effect would have been anti-dilutive.
Approximately 23,000 shares related to outstanding stock options and restricted stock units were excluded from the computation of diluted earnings (loss) per share because they were antidilutive. All options were included in the computation of diluted earnings per share for the years ended September 30, 2010 and 2009, respectively, as the options’ exercise prices were less than the average market price of our common stock.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6920599&loc=d3e1252-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=6945512&loc=d3e4984-109258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6920599&loc=d3e1278-109256 Reference 5: 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 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
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