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Subsequent Events	12 Months Ended
Subsequent Events	Sep. 30, 2017
Subsequent Events [Abstract]
Subsequent Events	19. SUBSEQUENT EVENT As a condition of the acquisition, we were required to hold separate and divest Rofin’s low power CO₂ laser business based in Hull, United Kingdom (the "Hull Business"), and have reported this business separately as a discontinued operation until its divestiture. In the third quarter of fiscal 2017, we entered into an agreement with a potential purchaser of the Hull Business and submitted our proposed purchaser to the European Commission for its review and approval, including the terms under which the purchase and operation of the Hull Business will occur. We completed the divestiture of the Hull Business on October 11, 2017, after receiving approval for the terms of the sale from the European Commission. We expect to record an immaterial gain on the divestiture in the first quarter of fiscal 2018.