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Selected Quarterly Data (Unaudited) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Selected Quarterly Data (Unaudited) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 54,677 | $ 47,760 | $ 32,944 | $ 29,135 | $ 42,409 | $ 33,342 | $ 22,483 | $ 22,074 | $ 164,516 | $ 120,308 | $ 104,883
Gross profit | 19,592 | 15,502 | 8,395 | 8,443 | 12,476 | 9,631 | 6,001 | 5,955 | 51,932 | 34,063 | 27,008
Provision for income taxes | 474 | 986 | 194 | 90 | 1,060 | 70 | 1,670 | 300 | 1,744 | 3,100 | 1,910
Net loss attributable to Amtech Systems, Inc. | $ 7,317 | $ 3,287 | $ (1,420) | $ (53) | $ (285) | $ (1,209) | $ (1,499) | $ (4,015) | 9,131 | (7,008) | (7,771)
Comprehensive income (loss) attributable to Amtech Systems, Inc. |  |  |  |  |  |  |  |  | $ 8,509 | $ (8,749) | $ (9,727)
Net loss per share attributable to Amtech Systems, Inc.: |  |  |  |  |  |  |  |  |  |  |
Basic (dollars per share) | $ 0.53 | $ 0.25 | $ (0.11) | $ 0.00 | $ (0.02) | $ (0.09) | $ (0.11) | $ (0.31) | $ 0.68 | $ (0.53) | $ (0.65)
Shares used in calculation, basic | 13,895 | 13,242 | 13,188 | 13,179 | 13,177 | 13,173 | 13,169 | 13,152 | 13,378 | 13,168 | 12,022
Diluted (dollars per share) | $ 0.51 | $ 0.25 | $ (0.11) | $ 0.00 | $ (0.02) | $ (0.09) | $ (0.11) | $ (0.31) | $ 0.68 | $ (0.53) | $ (0.65)
Shares used in calculation, diluted | 14,294 | 13,398 | 13,188 | 13,179 | 13,177 | 13,173 | 13,169 | 13,152 | 13,501 | 13,168 | 12,022

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- Definition Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income. Excludes changes in equity resulting from investments by owners and distributions to owners. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=96868048&loc=SL4569616-111683 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4K -URI http://asc.fasb.org/extlink&oid=84234705&loc=SL4591552-111686 + Details
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