Commitments and Contingencies	12 Months Ended
Sep. 30, 2018
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Purchase Obligations – As of September 30, 2018, we had unrecorded purchase obligations in the amount of $15.0 million. These purchase obligations consist of outstanding purchase orders for goods and services. While the amount represents purchase agreements, the actual amounts to be paid may be less in the event that any agreements are renegotiated, canceled or terminated. Development Projects – In fiscal 2014, Tempress Systems, Inc. (“Tempress”) entered into an agreement with the Energy Research Centre of the Netherlands (“ECN”), a Netherlands government sponsored research institute, for a joint research and development project. Under the terms of the agreement, Tempress sold an ion implanter (“Equipment”) to ECN for $1.4 million. Both Tempress and ECN are performing research and development projects utilizing the Equipment at the ECN facilities. Each party to the agreement has 100% rights to the results of the projects developed separately by the individual parties. Any results co-developed will be jointly owned. Tempress met its requirement to contribute $1.4 million to the project through equipment and services prior to fiscal 2017. Legal Proceedings – We are defendants from time to time in actions for matters arising out of our business operations. We regularly evaluate the status of the legal proceedings in which we are involved to assess whether a loss is probable or there is a reasonable possibility that a loss, or an additional loss, may have been incurred and determine if accruals are appropriate. If accruals are not appropriate, we further evaluate each legal proceeding to assess whether an estimate of possible loss or range of possible loss can be made for disclosure. Although litigation is inherently unpredictable, we believe that we have adequate provisions for any probable and estimable losses. It is possible, nevertheless, that our consolidated financial position, results of operations or liquidity could be materially and adversely affected in any particular period by the resolution of a legal proceeding. Legal expenses related to defense, negotiations, settlements, rulings and advice of outside legal counsel are expensed as incurred. Operating Leases – We lease buildings, vehicles and equipment under operating leases. Rental expense under such operating leases was $1.0 million, $1.2 million, and $1.4 million in 2018, 2017 and 2016, respectively. As of September 30, 2018, future minimum rental commitments under non-cancelable operating leases with initial or remaining terms of one year or more totaled $1.7 million, of which $1.0 million, $0.4 million and $0.2 million is payable in 2019, 2020 and 2021, respectively, and less than $0.1 million in each of 2022, 2023 and 2024, and none thereafter. Employment Contracts – We have employment contracts with, and severance plans covering, certain officers and management employees under which severance payments would become payable in the event of specified terminations without cause or terminations under certain circumstances after a change in control. If severance payments under the current employment agreements or plan payments were to become payable, the severance payments would generally range from twelve to thirty-six months of salary.

Commitments and Contingencies

Purchase Obligations – As of September 30, 2018, we had unrecorded purchase obligations in the amount of $15.0 million. These purchase obligations consist of outstanding purchase orders for goods and services. While the amount represents purchase agreements, the actual amounts to be paid may be less in the event that any agreements are renegotiated, canceled or terminated.

Development Projects – In fiscal 2014, Tempress Systems, Inc. (“Tempress”) entered into an agreement with the Energy Research Centre of the Netherlands (“ECN”), a Netherlands government sponsored research institute, for a joint research and development project. Under the terms of the agreement, Tempress sold an ion implanter (“Equipment”) to ECN for $1.4 million. Both Tempress and ECN are performing research and development projects utilizing the Equipment at the ECN facilities. Each party to the agreement has 100% rights to the results of the projects developed separately by the individual parties. Any results co-developed will be jointly owned. Tempress met its requirement to contribute $1.4 million to the project through equipment and services prior to fiscal 2017.

Legal Proceedings – We are defendants from time to time in actions for matters arising out of our business operations. We regularly evaluate the status of the legal proceedings in which we are involved to assess whether a loss is probable or there is a reasonable possibility that a loss, or an additional loss, may have been incurred and determine if accruals are appropriate. If accruals are not appropriate, we further evaluate each legal proceeding to assess whether an estimate of possible loss or range of possible loss can be made for disclosure. Although litigation is inherently unpredictable, we believe that we have adequate provisions for any probable and estimable losses. It is possible, nevertheless, that our consolidated financial position, results of operations or liquidity could be materially and adversely affected in any particular period by the resolution of a legal proceeding. Legal expenses related to defense, negotiations, settlements, rulings and advice of outside legal counsel are expensed as incurred.

Operating Leases – We lease buildings, vehicles and equipment under operating leases. Rental expense under such operating leases was $1.0 million, $1.2 million, and $1.4 million in 2018, 2017 and 2016, respectively. As of September 30, 2018, future minimum rental commitments under non-cancelable operating leases with initial or remaining terms of one year or more totaled $1.7 million, of which $1.0 million, $0.4 million and $0.2 million is payable in 2019, 2020 and 2021, respectively, and less than $0.1 million in each of 2022, 2023 and 2024, and none thereafter.

Employment Contracts – We have employment contracts with, and severance plans covering, certain officers and management employees under which severance payments would become payable in the event of specified terminations without cause or terminations under certain circumstances after a change in control. If severance payments under the current employment agreements or plan payments were to become payable, the severance payments would generally range from twelve to thirty-six months of salary.