Income Taxes	9 Months Ended
Jun. 30, 2018
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes For all periods, the Company computed the provision for income taxes based on the actual year-to-date effective tax rate by applying the discrete method. Use of the annual effective tax rate, which relies on accurate projections by legal entity of income earned and taxed in foreign jurisdictions, as well as accurate projections by legal entity of permanent and temporary differences, was not considered a reliable estimate for purposes of calculating year-to-date income tax expense. The Tax Act significantly revises future U.S. corporate income taxes by, among other things, lowering U.S. corporate income tax rates and implementing a modified territorial tax system. Because the Company has a September 30 fiscal year end, the lower corporate income tax rate will be phased in, resulting in a U.S. statutory federal rate of approximately 24.5% for the Company’s fiscal year ending September 30, 2018 and 21.0% for subsequent fiscal years. The Tax Act also provided for certain transition impacts. As part of the transition to the new modified territorial tax system, the Tax Act imposes a one-time repatriation tax on deemed repatriation of historical earnings of foreign subsidiaries. The Company does not currently anticipate an impact from the repatriation tax charge. For the nine months ended June 30, 2018, the impact of the Tax Act resulted in a net tax benefit of approximately $4.5 million, related solely to the remeasurement of the Company’s net deferred tax liabilities at the lower enacted corporate tax rates. In accordance with recently issued SEC guidance, the estimated net income tax benefit of $4.5 million is considered provisional representing the Company’s current best estimate based on interpretation of the provisions of the Tax Act, as data continues to be accumulated in order to finalize the underlying calculations. In addition, due to the broad and complex changes contained in the Tax Act, the Company’s current estimate of the impact may be influenced by, among other things, changes in interpretations of the Tax Act, any legislative action to address questions that arise because of the Tax Act and any changes in accounting standards for income taxes or related interpretations issued in response to the Tax Act. The Company anticipates finalizing and recording any resulting adjustments by the end of its current fiscal year ending September 30, 2018. Income tax expense for the three months ended June 30, 2018 was $9.7 million on pre-tax income of $27.2 million compared to the income tax expense of $5.9 million on pre-tax income of $16.1 million for the three months ended June 30, 2017. The current tax expense was largely attributable to income on profitable U.S. operations. The prior period tax expense was largely attributable to deferred taxes on profitable U.S. operations. Income tax expense for the nine months ended June 30, 2018 was $15.6 million on pre-tax income of $60.0 million compared to the income tax expense of $4.0 million on pre-tax income of $4.8 million for the nine months ended June 30, 2017. The current period tax expense was attributable to profitable U.S. and foreign operations. The expense generated in the U.S. was offset by a current period benefit on deferred tax liabilities as a result of the impact of the Tax Act. The prior period tax expense was largely attributed to foreign income tax expense on profitable foreign operations. At June 30, 2018 and September 30, 2017, the valuation allowance was $3.2 million and $3.1 million, respectively, primarily related to operations in Asia. In assessing the realizability of deferred tax assets, management considers whether it is more likely than not that some portion or all of the deferred tax assets will not be realized. The ultimate realization of deferred tax assets is dependent upon the generation of future taxable income during the periods in which those temporary differences become deductible. Based upon management’s expectations at June 30, 2018, management believes it is more likely than not that it will realize the majority of its deferred tax assets. Uncertain Tax Positions In connection with the Ultra Chem Acquisition, the Company recorded income tax-related uncertainties totaling $1.4 million, inclusive of interest and penalties. Additionally, the Company also recognized indemnification assets related to certain of these income tax-related uncertainties. The indemnification assets were included in Other current assets and Other non-current assets in the condensed consolidated balance sheets, representing the reimbursement the Company reasonably expected to receive from funds held in escrow pursuant to the purchase agreement. See Note 3. The Company recognizes interest and penalties related to uncertain tax positions, if any, as a component of Income tax expense in the condensed consolidated statements of operations. There was an insignificant amount of interest and penalties recognized during all periods. The Company had $3.8 million and $1.8 million related to uncertain tax positions, including related accrued interest and penalties as of June 30, 2018 and September 30, 2017, respectively. Between the time of the initial recording of the uncertain tax provisions associated with the Ultra Chem Acquisition and the nine months ended June 30, 2018, the Company reduced the reserve by approximately $0.4 million due to the lapse of the applicable statute of limitations. During the third fiscal quarter of 2018, the Company recorded certain newly identified tax contingencies totaling $2.3 million, primarily related to the Company’s foreign operations. Separately, the Company also recognized $1.8 million of deferred tax assets, representing the reduction in income taxes the Company reasonably expects to recognize related to these foreign operations’ income tax-related uncertainties.

Income Taxes

For all periods, the Company computed the provision for income taxes based on the actual year-to-date effective tax rate by applying the discrete method. Use of the annual effective tax rate, which relies on accurate projections by legal entity of income earned and taxed in foreign jurisdictions, as well as accurate projections by legal entity of permanent and temporary differences, was not considered a reliable estimate for purposes of calculating year-to-date income tax expense.

The Tax Act significantly revises future U.S. corporate income taxes by, among other things, lowering U.S. corporate income tax rates and implementing a modified territorial tax system. Because the Company has a September 30 fiscal year end, the lower corporate income tax rate will be phased in, resulting in a U.S. statutory federal rate of approximately 24.5% for the Company’s fiscal year ending September 30, 2018 and 21.0% for subsequent fiscal years. The Tax Act also provided for certain transition impacts. As part of the transition to the new modified territorial tax system, the Tax Act imposes a one-time repatriation tax on deemed repatriation of historical earnings of foreign subsidiaries. The Company does not currently anticipate an impact from the repatriation tax charge.

For the nine months ended June 30, 2018, the impact of the Tax Act resulted in a net tax benefit of approximately $4.5 million, related solely to the remeasurement of the Company’s net deferred tax liabilities at the lower enacted corporate tax rates.

In accordance with recently issued SEC guidance, the estimated net income tax benefit of $4.5 million is considered provisional representing the Company’s current best estimate based on interpretation of the provisions of the Tax Act, as data continues to be accumulated in order to finalize the underlying calculations. In addition, due to the broad and complex changes contained in the Tax Act, the Company’s current estimate of the impact may be influenced by, among other things, changes in interpretations of the Tax Act, any legislative action to address questions that arise because of the Tax Act and any changes in accounting standards for income taxes or related interpretations issued in response to the Tax Act. The Company anticipates finalizing and recording any resulting adjustments by the end of its current fiscal year ending September 30, 2018.

Income tax expense for the three months ended June 30, 2018 was $9.7 million on pre-tax income of $27.2 million compared to the income tax expense of $5.9 million on pre-tax income of $16.1 million for the three months ended June 30, 2017. The current tax expense was largely attributable to income on profitable U.S. operations. The prior period tax expense was largely attributable to deferred taxes on profitable U.S. operations.

Income tax expense for the nine months ended June 30, 2018 was $15.6 million on pre-tax income of $60.0 million compared to the income tax expense of $4.0 million on pre-tax income of $4.8 million for the nine months ended June 30, 2017. The current period tax expense was attributable to profitable U.S. and foreign operations. The expense generated in the U.S. was offset by a current period benefit on deferred tax liabilities as a result of the impact of the Tax Act. The prior period tax expense was largely attributed to foreign income tax expense on profitable foreign operations.

At June 30, 2018 and September 30, 2017, the valuation allowance was $3.2 million and $3.1 million, respectively, primarily related to operations in Asia. In assessing the realizability of deferred tax assets, management considers whether it is more likely than not that some portion or all of the deferred tax assets will not be realized. The ultimate realization of deferred tax assets is dependent upon the generation of future taxable income during the periods in which those temporary differences become deductible. Based upon management’s expectations at June 30, 2018, management believes it is more likely than not that it will realize the majority of its deferred tax assets.

Uncertain Tax Positions

In connection with the Ultra Chem Acquisition, the Company recorded income tax-related uncertainties totaling $1.4 million, inclusive of interest and penalties. Additionally, the Company also recognized indemnification assets related to certain of these income tax-related uncertainties. The indemnification assets were included in Other current assets and Other non-current assets in the condensed consolidated balance sheets, representing the reimbursement the Company reasonably expected to receive from funds held in escrow pursuant to the purchase agreement. See Note 3.

The Company recognizes interest and penalties related to uncertain tax positions, if any, as a component of Income tax expense in the condensed consolidated statements of operations. There was an insignificant amount of interest and penalties recognized during all periods. The Company had $3.8 million and $1.8 million related to uncertain tax positions, including related accrued interest and penalties as of June 30, 2018 and September 30, 2017, respectively. Between the time of the initial recording of the uncertain tax provisions associated with the Ultra Chem Acquisition and the nine months ended June 30, 2018, the Company reduced the reserve by approximately $0.4 million due to the lapse of the applicable statute of limitations. During the third fiscal quarter of 2018, the Company recorded certain newly identified tax contingencies totaling $2.3 million, primarily related to the Company’s foreign operations. Separately, the Company also recognized $1.8 million of deferred tax assets, representing the reduction in income taxes the Company reasonably expects to recognize related to these foreign operations’ income tax-related uncertainties.