Income Taxes	6 Months Ended
Mar. 31, 2017
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The Company recorded an income tax provision of $3.4 million and $6.2 million, respectively, during the three and six months ended March 31, 2017. The provision recorded during each period was primarily driven by foreign income. Tax provision during the six months ended March 31, 2017 was partially offset by $0.7 million of tax benefits related to the reduction of reserves for unrecognized tax benefits resulting from the expiration of statutes of limitations. The Company recorded an income tax provision of $78.2 million and $74.9 million, respectively, during the three and six months ended March 31, 2016. The provision recorded in each period was primarily driven by the change in a valuation allowance against U.S. net deferred tax assets during the three months ended March 31, 2016. Partially offsetting the valuation allowance provision were benefits related to pre-tax losses in the U.S., the reinstatement of the U.S. research and development tax credit retroactive to January 1, 2015, and reductions of reserves for unrecognized tax benefits resulting from the expiration of the statute of limitations. The Company evaluates the realizability of its deferred tax assets by tax-paying component and assesses the need for a valuation allowance on an annual and quarterly basis. The Company evaluates the profitability of each tax-paying component on a historic cumulative basis and on a forward looking basis in the course of performing this analysis. The Company evaluated all positive and negative evidence in concluding it was appropriate to establish a full valuation allowance against U.S. net deferred tax assets during the three months ended March 31, 2016. The Company maintained such allowance at March 31, 2017 and September 30, 2016 and will continue to maintain it until there is sufficient positive evidence to support the reversal of all or some portion of these allowances. Please refer to Note 12, "Income Taxes" to the Company's consolidated financial statements included in the 2016 Annual Report in the Form 10-K for further information on the valuation allowance. The Company is subject to U.S. federal income tax and various state, local and international income taxes in various jurisdictions. The amount of income taxes paid is subject to the Company's interpretation of applicable tax laws in the jurisdictions in which it files tax returns. In the normal course of business, the Company is subject to income tax audits in various global jurisdictions in which it operates. The years subject to examination vary for the U.S. and international jurisdictions, with the earliest tax year being 2010. Based on the outcome of these examinations or the expiration of statutes of limitations for specific jurisdictions, it is reasonably possible that the related unrecognized tax benefits could change from those recorded in the Company's unaudited Consolidated Balance Sheets. The Company currently anticipates that it is reasonably possible that the unrecognized tax benefits will be reduced by approximately $0.7 million within the next twelve months.

Income Taxes

The Company recorded an income tax provision of $3.4 million and $6.2 million, respectively, during the three and six months ended March 31, 2017. The provision recorded during each period was primarily driven by foreign income. Tax provision during the six months ended March 31, 2017 was partially offset by $0.7 million of tax benefits related to the reduction of reserves for unrecognized tax benefits resulting from the expiration of statutes of limitations.

The Company recorded an income tax provision of $78.2 million and $74.9 million, respectively, during the three and six months ended March 31, 2016. The provision recorded in each period was primarily driven by the change in a valuation allowance against U.S. net deferred tax assets during the three months ended March 31, 2016. Partially offsetting the valuation allowance provision were benefits related to pre-tax losses in the U.S., the reinstatement of the U.S. research and development tax credit retroactive to January 1, 2015, and reductions of reserves for unrecognized tax benefits resulting from the expiration of the statute of limitations.

The Company evaluates the realizability of its deferred tax assets by tax-paying component and assesses the need for a valuation allowance on an annual and quarterly basis. The Company evaluates the profitability of each tax-paying component on a historic cumulative basis and on a forward looking basis in the course of performing this analysis. The Company evaluated all positive and negative evidence in concluding it was appropriate to establish a full valuation allowance against U.S. net deferred tax assets during the three months ended March 31, 2016. The Company maintained such allowance at March 31, 2017 and September 30, 2016 and will continue to maintain it until there is sufficient positive evidence to support the reversal of all or some portion of these allowances. Please refer to Note 12, "Income Taxes" to the Company's consolidated financial statements included in the 2016 Annual Report in the Form 10-K for further information on the valuation allowance.

The Company is subject to U.S. federal income tax and various state, local and international income taxes in various jurisdictions. The amount of income taxes paid is subject to the Company's interpretation of applicable tax laws in the jurisdictions in which it files tax returns. In the normal course of business, the Company is subject to income tax audits in various global jurisdictions in which it operates. The years subject to examination vary for the U.S. and international jurisdictions, with the earliest tax year being 2010. Based on the outcome of these examinations or the expiration of statutes of limitations for specific jurisdictions, it is reasonably possible that the related unrecognized tax benefits could change from those recorded in the Company's unaudited Consolidated Balance Sheets. The Company currently anticipates that it is reasonably possible that the unrecognized tax benefits will be reduced by approximately $0.7 million within the next twelve months.