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Income Taxes | 9 Months Ended
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Dec. 31, 2018
Income Tax Disclosure [Abstract] |
Income Taxes | Income Taxes The provision for income taxes reflects tax on foreign earnings and federal and state tax on U.S. earnings. The Company’s effective tax rates for the nine months ended December 31, 2018 and December 31, 2017 were not meaningful due to the amount of pre-tax income and the tax benefits recorded during the period. The Company's effective tax rate for the nine months ended December 31, 2018 is lower compared to the prior year primarily due to discrete benefits related to releases of uncertain tax positions due to lapses of statutes of limitations, successful closure of tax examinations, discrete adjustments to deferred tax assets related to intellectual property, offset by the impact of the new Global Intangible Low-Taxed Income (“GILTI”) tax in the United States. The Company's effective tax rate is different than statutory rates in the U.S. due to one-time discrete tax benefits related to changes in U.S. and foreign tax laws, changes in uncertain tax benefit positions, and favorable adjustments from revaluing deferred tax assets related to intellectual property. In addition, the Company has numerous tax holidays it receives related to its Thailand manufacturing operations based on its investment in property, plant and equipment in Thailand, as well as Microsemi’s tax holiday in Malaysia that effectively reduces its income tax rate in that jurisdiction. The Company's tax holiday periods in Thailand expire at various times in the future, however, the Company actively seeks to obtain new tax holidays. The Company does not expect the future expiration of any of its tax holiday periods in Thailand to have a material impact on its effective tax rate. Microsemi’s tax holiday in Malaysia was granted in 2009 and is effective through December 2019, subject to continued compliance with the tax holiday’s requirements. The material components of foreign income taxed at a rate lower than the U.S. are earnings accrued in Thailand, Malta and Ireland. The Company files U.S. federal, U.S. state, and foreign income tax returns. For U.S. federal, and in general for U.S. state tax returns, the fiscal 2005 and later tax years remain effectively open for examination by tax authorities. For foreign tax returns, the Company is generally no longer subject to income tax examinations for years prior to fiscal 2007. The Company records benefits for uncertain tax positions based on an assessment of whether it is more likely than not that the tax positions will be sustained based on their technical merits under currently enacted law. If this threshold is not met, no tax benefit of the uncertain tax position is recognized. If this threshold is met, the Company recognizes the largest amount of the tax benefit that is more likely than not to be realized upon ultimate settlement. The Company believes that it has appropriate support for the income tax positions taken and to be taken on its tax returns and that its accruals for tax liabilities are adequate for all open years based on an assessment of many factors including past experience and interpretations of tax laws applied to the facts of each matter. The Company believes it maintains appropriate reserves to offset any potential income tax liabilities that may arise upon final resolution of matters for open tax years. If such reserve amounts ultimately prove to be unnecessary, the resulting reversal of such reserves could result in tax benefits being recorded in the period the reserves are no longer deemed necessary. If such amounts prove to be less than an ultimate assessment, a future charge to expense would be recorded in the period in which the assessment is determined. The following tables summarize the activity related to the Company’s gross unrecognized tax benefits for the nine months ended December 31, 2018 and the year ended March 31, 2018 (in millions):
| Nine Months Ended December 31, 2018
Balance at March 31, 2018 | $ | 436.0 |
Increases related to acquisitions | 284.0 |
Decreases related to settlements with tax authorities | (3.2 | )
Decreases related to statute of limitation expirations | (10.5 | )
Increases related to current year tax positions | 11.0 |
Decreases related to prior year tax positions | (36.9 | )
Balance at December 31, 2018 | $ | 680.4 |
| Year Ended March 31, 2018
Balance at March 31, 2017 | $ | 398.5 |
Increases related to acquisitions | — |
Decreases related to settlements with tax authorities | (0.1 | )
Decreases related to statute of limitation expirations | (10.9 | )
Increases related to current year tax positions | 30.3 |
Increases related to prior year tax positions | 18.2 |
Balance at March 31, 2018 | $ | 436.0 |
As of December 31, 2018, the Company had accrued approximately $31.4 million related to the potential payment of interest on the Company’s uncertain tax positions. The current year increase to the potential payment of interest is primarily composed of a $23.2 million increase related to acquisitions. As of March 31, 2018, the Company had accrued approximately $12.9 million related to the potential payment of interest on the Company’s uncertain tax positions. As of December 31, 2018, the Company had accrued for $51.4 million of penalties related to its uncertain tax positions. The current year decrease to the potential payment of penalties is primarily composed of tax positions that were effectively settled and statute of limitation expirations offset by a $15.8 million increase related to acquisitions. As of March 31, 2018, the Company had accrued for approximately $67.9 million of penalties related to its uncertain tax positions. On December 22, 2017, the Tax Cuts and Jobs Act (the "Act") was enacted into law. The Act provides for numerous significant tax law changes and modifications including the reduction of the U.S. federal corporate income tax rate from 35.0% to 21.0%, the requirement for companies to pay a one-time transition tax on earnings of certain foreign subsidiaries that were previously tax deferred and the creation of new taxes on certain foreign-sourced earnings. Accounting Standards Codification ("ASC") 740, Income Taxes, requires companies to recognize the effect of the tax law changes in the period of enactment. However, the SEC staff issued Staff Accounting Bulletin ("SAB") 118 which allowed companies to record provisional amounts during a measurement period that is similar to the measurement period used when accounting for business combinations. The Company recorded a reasonable estimate when measurable and with the understanding that the provisional amount was subject to further adjustments under SAB 118. In addition, for significant items for which the Company could not make a reasonable estimate, no provisional amounts were recorded. As of December 31, 2018, the Company completed its review of the previously recorded provisional amounts related to the Act, recorded necessary adjustments, and the amounts are now final under SAB 118. As of March 31, 2018, the Company remeasured certain deferred tax assets and liabilities based on the rates at which they were expected to reverse in the future (which was generally 21%), by recording a provisional income tax benefit of $136.7 million. Upon further analysis of certain aspects of the Act and refinement of its calculations during the period ended December 31, 2018, the Company did not make adjustments to the provisional amount. The one-time transition tax is based on the Company's total post-1986 earnings and profits (E&P), the tax on which the Company previously deferred from U.S. income taxes under U.S. law. The Company recorded a provisional amount for its one-time transition tax expense for each of its foreign subsidiaries, resulting in a transition tax expense of $644.7 million at March 31, 2018. Upon further analyses of the Act and notices and regulations issued and proposed by the U.S. Department of the Treasury and the Internal Revenue Service, the Company finalized its calculations of the transition tax expense during the period ended December 31, 2018. The Company increased its March 31, 2018 provisional amount by $13.1 million to $657.8 million, which is included as a component of income tax expense from continuing operations. The measurement period adjustment of $13.1 million decreased basic and diluted net income per common share by $0.06 and $0.05, respectively, for the nine months ended December 31, 2018. As of March 31, 2018, the Company removed its valuations allowance on certain foreign tax credits and recorded a provisional income tax benefit of $36.4 million. Upon further analysis of the Act, the Company did not make adjustments to the provisional amount. The Act subjects a U.S. shareholder to tax on Global Intangible Low-Taxed Income (GILTI) earned by certain foreign subsidiaries. The FASB Staff Q&A, Topic 740, No. 5, Accounting for Global Intangible Low-Taxed Income, states that an entity can make an accounting policy election to either recognize deferred taxes for temporary basis differences expected to reverse as GILTI in future years or to provide for the tax expense related to GILTI in the year the tax is incurred as a period expense only. We have elected to account for GILTI in the year the tax is incurred.

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- Definition The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -URI http://asc.fasb.org/topic&trid=2144680 + Details
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