Income Taxes	6 Months Ended
Income Taxes	Sep. 30, 2018
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The Company’s income tax provision consists of federal, state and foreign income taxes. The tax provision for the second quarter of fiscal 2019 and 2018 was based on the estimated effective tax rates applicable for the full years ending March 31, 2019 and March 31, 2018, respectively, after giving effect to items specifically related to the interim periods. The Company’s effective income tax rate with respect to any period may be volatile based on the mix of income in the tax jurisdictions in which the Company operates, change in tax laws and the amount of the Company's consolidated income before taxes. On December 22, 2017, the Tax Cuts and Jobs Act (“Tax Act”) was enacted into law. Among the significant changes resulting from the law, the Tax Act reduced the U.S. federal income tax rate from 35% to 21% effective January 1, 2018, and required companies to pay a one-time transition tax on unrepatriated cumulative non-U.S. earnings of foreign subsidiaries and created new taxes on certain foreign sourced earnings. The U.S. federal statutory tax rate for fiscal 2019 is 21.0%. As of September 30, 2018, the Company has not completed its accounting for the tax effects of enactment of the Tax Act; however, it has made a reasonable estimate of the effects on its existing deferred tax balances and the one-time transition tax. The Company did not obtain additional information during the quarter affecting the provisional amounts initially recorded for the year ended March 31, 2018. In accordance with Staff Accounting Bulletin 118, these amounts are considered provisional and may be affected by future guidance, if and when issued. The Company’s estimate of its transition tax liability may change when the Company finalizes both the calculation of post-1986 foreign earnings and profits previously deferred from U.S. federal taxation and the amounts held in cash or other specified assets. Beginning in fiscal 2019, the global intangible low-taxed income (“GILTI”), foreign derived intangible income (“FDII”), and base-erosion and anti-abuse (“BEAT”) provisions became effective. The GILTI provisions require the Company to include in its US income tax return foreign subsidiary earnings in excess of an allowable return on the foreign subsidiary’s tangible assets. Due to the complexities of the GILTI tax rules, the Company is continuing to evaluate the application of ASC 740. Under US GAAP, the Company is allowed to make an accounting policy choice of either (1) treating the taxes due on future US inclusions in taxable income as a current-period expense when incurred (“period cost method”) or (2) factoring amounts into a Company’s measurement of its deferred taxes (“deferred method”). As of the second quarter of fiscal 2019, the Company has not elected an accounting policy treatment for which method the Company will utilize for GILTI. Based on existing legislative guidance and interpretation, the Company has estimated the impact on the tax provision of the GILTI inclusion, offset by the related foreign tax credit, and expects the annual effective tax rate to be increased by approximately 2.8%. FDII allows a new deduction for U.S. corporations up to 37.5% of foreign derived intangible income. This is an export incentive that reduces the tax on foreign derived sales and service income in excess of a base amount to 13.125%. Based upon the existing legislative guidance and interpretation, the Company has estimated the impact on the annual effective tax rate to be decreased by approximately 0.5%. The BEAT provisions eliminate the deductions of certain base-erosion payments to related foreign corporations and impose a minimum tax if greater than regular tax. The Company does not expect to be subject to BEAT in fiscal 2019. The consolidated effective income tax rates for the second quarter of fiscal 2019 and 2018 were 18.6% and 21.7%, respectively, and for the six months of fiscal 2019 and 2018 were 19.1% and 21.2%, respectively. The rate decrease in the second quarter and six months of fiscal 2019 compared to the comparable prior year periods of fiscal 2018 is primarily due to changes in the mix of earnings among tax jurisdictions and items related to the Tax Act. The Tax Act items accounted for a net decrease of 2.2% comprising a 4.5% decrease for the rate change, a 0.5% decrease for the FDII deduction and a 2.8% increase for GILTI inclusion. Foreign income as a percentage of worldwide income is estimated to be 68% for fiscal 2019 compared to 63% for fiscal 2018. The foreign effective income tax rates for the six months of fiscal 2019 and 2018 were 11.1% and 11.2%, respectively. The rate decrease compared to the prior year period is primarily due to changes in the mix of earnings among tax jurisdictions. Income from the Company's Swiss subsidiary comprised a substantial portion of the Company's overall foreign mix of income and is taxed at an effective income tax rate of approximately 6%.