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Income Taxes
 6 Months Ended
Sep. 30, 2025
Income Tax Disclosure [Abstract]  
Income Taxes Income Taxes
The Company accounts for income taxes in accordance with ASC 740. The provision for income taxes is attributable to U.S. federal, state, and foreign income taxes. The Company’s tax benefit for the six months ended September 30, 2025 resulted in a negative effective tax rate of 44.4% and is based on an estimated annual effective tax rate including the tax effect of items required to be recorded discretely in the interim periods in which those items occur. A comparison of the Company’s effective tax rates for the six months ended September 30, 2025 and September 30, 2024 is not meaningful due to changes in the amount of pre-tax income earned, changes in the mix of jurisdictions in which income is earned, and the impact of discrete items relative to the amount of income earned.

The Company's effective tax rate is different than the statutory rates in the U.S. due to foreign income taxed at different rates than the U.S., changes in uncertain tax benefit positions, changes to valuation allowances, generation of tax credits, and the impact of Global Intangible Low Tax Income (GILTI) in the U.S. 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. 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 material components of foreign income taxed at a rate lower than the U.S. are earnings accrued in Thailand, Malta, and Ireland.

The following table summarizes the activity related to the Company's gross unrecognized tax benefits for the six months ended September 30, 2025 and the year ended March 31, 2025 (in millions): 
September 30,March 31,
20252025
Beginning gross unrecognized tax benefit$821.2 $792.4 
Decreases related to settlements with tax authorities(50.4)(0.7)
Decreases related to statute of limitation expirations(5.1)(6.9)
Increases related to current year tax positions8.8 27.1 
Increases (decreases) related to prior year tax positions(83.2)9.3 
Ending gross unrecognized tax benefits$691.3 $821.2 
 
As of September 30, 2025 and March 31, 2025, the Company had accrued interest and penalties related to tax contingencies of $103.2 million and $135.8 million, respectively, included within long-term income tax payable on the consolidated balance sheets. During the six months ended September 30, 2025, the Company released previously accrued interest and penalties of $32.6 million, compared to the charges in interest and penalties to operations of $31.2 million in the fiscal year ended March 31, 2025.

The Company is currently under income tax examination in various tax jurisdictions in which it operates. The years under examination range from fiscal 2007 through fiscal 2024. In some jurisdictions, the Company has received tax assessments in excess of established reserves. The Company is contesting these tax assessments, and will continue to do so, including pursuing all available remedies such as appeals and litigation, if necessary. During fiscal 2026, additional assessments were received for these issues and the Company’s position remains unchanged.

The total amount of gross unrecognized tax benefits was $691.3 million and $821.2 million as of September 30, 2025, and March 31, 2025, respectively, of which $613.5 million and $706.4 million is estimated to impact the Company's effective tax rate, if recognized. Unrecognized tax benefits may change in the next 12 months due to expiration of statutes of limitation, changes in the Company’s judgment about the level of uncertainty arising from new information, status of tax examinations, tax litigation, and legislative changes. The Company is unable to reasonably estimate the change in the unrecognized tax benefits in the next 12 months. Positions that may be resolved include various U.S. and non-U.S. matters.

The Company reviews its unrecognized tax positions at each interim period. In the quarter ending September 30, 2025, due to settlements reached with tax authorities, the Company determined that certain unrecognized tax positions should be remeasured, including the indirect tax effects, penalties, and interest associated with these unrecognized tax positions. The effect of this change in estimate was to record an income tax benefit of $24.4 million, which increased basic net income per common share by $0.05 for each of the three and six months ended September 30, 2025, and increased diluted net income per common share by $0.04 and $0.05 for the three and six months ended September 30, 2025, respectively, and which are a component of income tax provision from continuing operations.
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 2007 and later tax years remain 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.

In September 2021, the Company received a Statutory Notice of Deficiency (2007 to 2012 Notice) from the United States Internal Revenue Service (IRS) for fiscal 2007 through fiscal 2012. The disputed amounts largely relate to transfer pricing matters. In December 2021, the Company filed a petition in the U.S. Tax Court challenging the 2007 to 2012 Notice. In September 2023, the Company received a Revenue Agent Report (RAR) from the IRS for fiscal 2013 and fiscal 2016. In October 2023, the Company received a Statutory Notice of Deficiency (2014 to 2015 Notice) from the IRS for fiscal 2014 and fiscal 2015. The disputed amounts for fiscal 2013 to fiscal 2016 largely relate to transfer pricing matters. In December 2023, the Company filed a petition in the U.S. Tax Court challenging the 2014 to 2015 Notice. In September 2025, the Company reached a settlement with the IRS for fiscal years 2007 through 2015.

In May 2023, the Company received a proposed income adjustment from the Malaysian Inland Revenue Board (IRB) for fiscal 2020. In December 2023, the Company received a Notice of Assessment from the IRB asserting the same proposed income adjustment. In March 2025, the Company entered into a Consent Judgment before the High Court, agreeing that the dispute will be heard before the Special Commissioners of Income Tax (SCIT). It was also agreed that the payment on the taxes assessed is stayed and the IRB will pause all enforcement and proceedings against the collection of the taxes assessed until the appeal before the SCIT is concluded. If the adjustment is upheld by the highest court that has jurisdiction over this matter in Malaysia, it could result in income taxes and penalties up to $410.0 million. The disputed amounts largely relate to the characterization of certain assets. The timing of adjudicating this matter is uncertain but could commence in the next 12 months.

In January 2025, the Company received several assessments from the German Tax Authorities (GTA) regarding the German extraterritorial taxation of royalty payments between nonresidents (referred to as offshore receipts in respect of intangible property or ORIP) and intellectual property transfers by nonresidents (referred to as extraterritorial capital gains taxation or ETT). If the assessment is upheld, it could result in income taxes and penalties up to $92.0 million. The timing of adjudicating this matter is uncertain but could occur in the next 12 months.

The Company firmly believes that the IRB and GTA assessments are without merit and plans to pursue all available administrative and judicial remedies necessary to resolve these matters. The Company intends to vigorously defend its positions and the Company is confident in its ability to prevail on the merits. The Company regularly assesses the likelihood of adverse outcomes resulting from examinations such as these to determine the adequacy of the Company's tax reserves. The ultimate outcome of disputes of this nature is uncertain, and if the IRB or GTA were to prevail on their assertions, the assessed tax, penalties, and deficiency interest could have a material adverse impact on the Company's financial position, results of operations or cash flows.