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Earnings Per Share (Tables) | 12 Months Ended
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Sep. 30, 2012
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted | Options and restricted stock of approximately 1,020,000, 145,000 and 229,000 shares are excluded from the fiscal 2012, 2011 and 2010 earnings per share calculations as they are anti-dilutive.
| 2012 |  | 2011 |  | 2010
| (dollars in thousands, except per share amounts)
Basic Earnings Per Share Computation |  |
Net income (loss) attributable to Amtech Systems, Inc. | $ | (23,031 | ) |  | $ | 22,882 |  |  | $ | 9,563 |
Weighted Average Shares Outstanding: |  |  |  |  |
Common stock | 9,471 |  |  | 9,480 |  |  | 9,022 |
Basic earnings (loss) per share attributable to Amtech shareholders | $ | (2.43 | ) |  | $ | 2.41 |  |  | $ | 1.06 |
Diluted Earnings Per Share Computation |  |  |  |  |
Net income (loss) attributable to Amtech Systems, Inc. | $ | (23,031 | ) |  | $ | 22,882 |  |  | $ | 9,563 |
Weighted Average Shares Outstanding: |  |  |  |  |
Common stock | 9,471 |  |  | 9,480 |  |  | 9,022 |
Common stock equivalents (1) | — |  |  | 284 |  |  | 215 |
Diluted shares | 9,471 |  |  | 9,764 |  |  | 9,237 |
Diluted earnings (loss) per share attributable to Amtech shareholders | $ | (2.43 | ) |  | $ | 2.34 |  |  | $ | 1.04 |
(1) The number of common stock equivalents is calculated using the treasury stock method and the average market price during the period.

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations. + References No definition available. + Details
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