Income Taxes	6 Months Ended
Sep. 30, 2018
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes Changes in Tax Law On December 22, 2017, H.R.1, also known as the Tax Cuts and Jobs Act (Tax Reform Act) was enacted into law. The Tax Reform Act includes significant changes to United States (US) corporate income tax law, including a permanent reduction in the federal corporate income tax rate from 35.0% to 21.0%, limitations on the deductibility of interest expense and executive compensation, the transition of the US tax regime from a worldwide tax system to a territorial tax system, and provisions aimed at preventing base erosion of the US tax base. Further, on December 22, 2017, the SEC issued Staff Accounting Bulletin No. 118 (SAB 118) which provides guidance on accounting for the impact of the Tax Reform Act. SAB 118 provides a measurement period, which should not extend beyond one year from the enactment date, during which the Company may complete the accounting for the impacts of the Tax Reform Act under Accounting Standards Codification (ASC) Topic 740 (ASC 740). In accordance with SAB 118, the Company must reflect the income tax effects of the Tax Reform Act in the reporting period in which the accounting under ASC 740 is complete. Provisional Estimates To the extent accounting for certain income tax effects of the Tax Reform Act is incomplete, the Company can determine a reasonable estimate for those effects and record a provisional estimate in the condensed consolidated financial statements in the first reporting period in which a reasonable estimate can be made. In accordance with SAB 118, the Company recorded provisional estimates during the fiscal year ended March 31, 2018, as detailed in the 2018 Annual Report, which represents reasonable estimates of the effects of the Tax Reform Act for which the analysis was not yet complete. As the Company completes its analysis of the effects of the Tax Reform Act, including collecting, preparing and analyzing necessary information regarding foreign earnings and profits, performing and refining calculations and obtaining additional guidance from such standard setting and regulatory bodies as the US Internal Revenue Service, US Treasury Department and FASB, among others, it may record adjustments to the provisional estimates. The Company expects to finalize its provisional estimates at the earlier of the time it files its US federal income tax return for the fiscal year ended March 31, 2018 or the end of the measurement period provided for under SAB 118, which is December 31, 2018. During the six months ended September 30, 2018, the Company recorded an adjustment to previously recorded provisional estimates for a decrease of $480 to state income tax expense associated with the one-time mandatory deemed repatriation of accumulated foreign earnings. The adjustment was driven by the Company's ongoing analysis and interpretation of state income tax laws resulting from the Tax Reform Act. The Tax Reform Act includes other provisions with effective dates for the Company on and after January 1, 2018. Provisions impacting the fiscal year ending March 31, 2019 include, but are not limited to, limiting deductibility of meals, entertainment, and executive compensation. Based on current facts and circumstances, the Company does not anticipate the impact of these provisions to be material. The Company continues to account for other changes that impact business-related income, exclusions, deductions, and credits that cannot yet be quantified based on existing accounting guidance and the provisions of the tax laws in effect immediately prior to the enactment of the Tax Reform Act. The Company continues to analyze the provisions of the Tax Reform Act to fully assess the anticipated impact on its condensed consolidated financial statements. Unrecognized Tax Benefits During the six months ended September 30, 2018, the amount of gross unrecognized tax benefits and associated interest and penalties increased by $36 to $12,855. Management believes it is reasonably possible that the amount of unrecognized tax benefits, as well as associated interest and penalties, may decrease during the next 12 months by approximately $2,488 related to the completion of examinations and other settlements with tax authorities and the expiration of statutes of limitations, of which $1,804 would result in an income tax benefit for the Company.

Income Taxes

Changes in Tax Law

On December 22, 2017, H.R.1, also known as the Tax Cuts and Jobs Act (Tax Reform Act) was enacted into law. The Tax Reform Act includes significant changes to United States (US) corporate income tax law, including a permanent reduction in the federal corporate income tax rate from 35.0% to 21.0%, limitations on the deductibility of interest expense and executive compensation, the transition of the US tax regime from a worldwide tax system to a territorial tax system, and provisions aimed at preventing base erosion of the US tax base. Further, on December 22, 2017, the SEC issued Staff Accounting Bulletin No. 118 (SAB 118) which provides guidance on accounting for the impact of the Tax Reform Act. SAB 118 provides a measurement period, which should not extend beyond one year from the enactment date, during which the Company may complete the accounting for the impacts of the Tax Reform Act under Accounting Standards Codification (ASC) Topic 740 (ASC 740). In accordance with SAB 118, the Company must reflect the income tax effects of the Tax Reform Act in the reporting period in which the accounting under ASC 740 is complete.

Provisional Estimates

To the extent accounting for certain income tax effects of the Tax Reform Act is incomplete, the Company can determine a reasonable estimate for those effects and record a provisional estimate in the condensed consolidated financial statements in the first reporting period in which a reasonable estimate can be made. In accordance with SAB 118, the Company recorded provisional estimates during the fiscal year ended March 31, 2018, as detailed in the 2018 Annual Report, which represents reasonable estimates of the effects of the Tax Reform Act for which the analysis was not yet complete. As the Company completes its analysis of the effects of the Tax Reform Act, including collecting, preparing and analyzing necessary information regarding foreign earnings and profits, performing and refining calculations and obtaining additional guidance from such standard setting and regulatory bodies as the US Internal Revenue Service, US Treasury Department and FASB, among others, it may record adjustments to the provisional estimates. The Company expects to finalize its provisional estimates at the earlier of the time it files its US federal income tax return for the fiscal year ended March 31, 2018 or the end of the measurement period provided for under SAB 118, which is December 31, 2018.

During the six months ended September 30, 2018, the Company recorded an adjustment to previously recorded provisional estimates for a decrease of $480 to state income tax expense associated with the one-time mandatory deemed repatriation of accumulated foreign earnings. The adjustment was driven by the Company's ongoing analysis and interpretation of state income tax laws resulting from the Tax Reform Act.

The Tax Reform Act includes other provisions with effective dates for the Company on and after January 1, 2018. Provisions impacting the fiscal year ending March 31, 2019 include, but are not limited to, limiting deductibility of meals, entertainment, and executive compensation. Based on current facts and circumstances, the Company does not anticipate the impact of these provisions to be material. The Company continues to account for other changes that impact business-related income, exclusions, deductions, and credits that cannot yet be quantified based on existing accounting guidance and the provisions of the tax laws in effect immediately prior to the enactment of the Tax Reform Act. The Company continues to analyze the provisions of the Tax Reform Act to fully assess the anticipated impact on its condensed consolidated financial statements.

Unrecognized Tax Benefits

During the six months ended September 30, 2018, the amount of gross unrecognized tax benefits and associated interest and penalties increased by $36 to $12,855. Management believes it is reasonably possible that the amount of unrecognized tax benefits, as well as associated interest and penalties, may decrease during the next 12 months by approximately $2,488 related to the completion of examinations and other settlements with tax authorities and the expiration of statutes of limitations, of which $1,804 would result in an income tax benefit for the Company.