Commitments and Contingencies	3 Months Ended
Dec. 31, 2023
Commitments And Contingencies [Abstract]
Commitments and Contingencies	Note 16. Commitments and Contingencies Environmental Environmental compliance requirements are a significant factor affecting our business. Our manufacturing processes are subject to numerous federal, state, local and international environmental laws and regulations, as well as the requirements of environmental permits and similar authorizations issued by various governmental authorities. We have incurred, and expect that we will continue to incur, significant capital, operating and other expenditures complying with applicable environmental laws and regulations. Changes in these laws, as well as litigation relating to these laws, could result in more stringent or additional environmental compliance obligations for the Company that may require additional capital investments or increase our operating costs. We are involved in various administrative and other proceedings relating to environmental matters that arise in the normal course of business, and we may become involved in similar matters in the future. Although the ultimate outcome of these proceedings cannot be predicted and we cannot at this time estimate any reasonably possible losses based on available information, we do not believe that the currently expected outcome of any environmental proceedings and claims that are pending or threatened against us will have a material adverse effect on our results of operations, financial condition or cash flows. We face potential liability under federal, state, local and international laws as a result of releases of hazardous substances into the environment from various sites owned and operated by third parties at which Company-generated wastes have allegedly been deposited. In addition, certain of our current or former locations are being investigated or remediated under various environmental laws, including Comprehensive Environmental Response, Compensation, and Liability Act of 1980 (“CERCLA”). Based on information known to us and assumptions, we do not believe that the costs of any ongoing investigation and remediation projects will have a material adverse effect on our results of operations, financial condition or cash flows. However, the discovery of contamination or the imposition of additional obligations, including investigation or remediation triggered by the closures or sales of former manufacturing facilities may necessitate, and/or natural resources damages at these or other sites in the future, could impact our results of operations, financial condition or cash flows. See “Note 19. Commitments and Contingencies” of the Notes to Consolidated Financial Statements section in the Fiscal 2023 Form 10-K for information related to environmental matters. As of December 31, 2023, we had $9.4 million reserved for environmental liabilities on an undiscounted basis, of which $3.3 million is included in Other noncurrent liabilities and $6.1 million is included in Other current liabilities, on the consolidated balance sheets, including amounts accrued in connection with environmental obligations relating to manufacturing facilities that we have closed. We believe the liabilities for these matters was adequately reserved at December 31, 2023. Climate Change Climate change presents risks and uncertainties for us. Unpredictable weather patterns or extended periods of severe weather may result in interruptions to our manufacturing operations, as well as supply chain disruptions and increased material costs, such as through impacts to virgin fiber supplies and prices, which may fluctuate during prolonged periods of heavy rain or drought, during tree disease or insect epidemics or other environmental conditions that may be caused by variations in climate conditions. To the extent that severe weather or other climate-related risks materialize, and we are unprepared for them, we may incur unexpected costs, which could have a material effect on our results of operations, cash flows and financial condition, and the trading price of our Common Stock may be adversely impacted. Responses to climate change may result in regulatory risks as new laws and regulations aimed at reducing greenhouse gas (“GHG”) emissions come into effect. We have systems in place for tracking the GHG emissions from our energy-intensive facilities, and we monitor developments in climate-related laws, regulations and policies to assess the potential impact of such developments on our results of operations, financial condition, cash flows and disclosure obligations. Compliance with climate programs may require future expenditures to meet GHG emission reduction obligations in future years. See “Note 19. Commitments and Contingencies” of the Notes to Consolidated Financial Statements section in the Fiscal 2023 Form 10-K for information related to climate change. Brazil Tax Liability We are challenging claims by the Brazil Federal Revenue Department that we underpaid tax, penalties and interest associated with a claim that a subsidiary of MeadWestvaco Corporation (the predecessor of MWV) had reduced its tax liability related to the goodwill generated by the 2002 merger of two of its Brazilian subsidiaries. The matter has proceeded through the Brazil Administrative Council of Tax Appeals (“CARF”) principally in two proceedings, covering tax years 2003 to 2008 and 2009 to 2012. The tax and interest claim relating to tax years 2009 to 2012 was finalized and is now the subject of an annulment action we filed in the Brazil federal court. CARF notified us of its final decision regarding the tax, penalties and interest claims relating to tax years 2003 to 2008 on June 3, 2020. We have filed an annulment action in Brazil federal court with respect to that decision as well. The dispute related to fraud penalties for tax years 2009 to 2012 was resolved by CARF in favor of WestRock effective January 23, 2023. We assert that we have no liability in these matters. The total amount in dispute before CARF and in the annulment actions relating to the claimed tax deficiency was R$723 million ($149 million) as of December 31, 2023, including various penalties and interest. The U.S. dollar equivalent has fluctuated significantly due to changes in exchange rates. The amount of our uncertain tax position reserve for this matter, which excludes certain penalties, is included in the unrecognized tax benefits table in our Fiscal 2023 Form 10-K; see “Note 7. Income Taxes” of the Notes to Consolidated Financial Statements in the Fiscal 2023 Form 10-K for additional information. Resolution of the uncertain tax positions could have a material adverse effect on our cash flows and results of operations or materially benefit our results of operations in future periods depending upon their ultimate resolution. Other Litigation During fiscal 2018, we submitted formal notification to withdraw from the PIUMPF and recorded a liability associated with the withdrawal. Subsequently, in fiscal 2019 and 2020, we received demand letters from PIUMPF, including a demand for withdrawal liabilities and for our proportionate share of PIUMPF's accumulated funding deficiency, and we refined our liability, the impact of which was not significant. We began making monthly payments for the PIUMPF withdrawal liabilities in fiscal 2020, excluding the accumulated funding deficiency demands. We dispute the accumulated funding deficiency demands. In February 2020, we received a demand letter from PIUMPF asserting that we owe $51.2 million for our pro-rata share of PIUMPF’s accumulated funding deficiency, including interest. Similarly, in April 2020, we received an updated demand letter related to a subsidiary of ours asserting that we owe $1.3 million of additional accumulated funding deficiency, including interest. The subsidiary for which we received the updated demand letter was sold in September 2023. In July 2021, the PIUMPF filed suit against us in the U.S. District Court for the Northern District of Georgia claiming the right to recover our pro rata share of the pension fund’s accumulated funding deficiency, along with interest, liquidated damages and attorney's fees. We believe we are adequately reserved for this matter. See “Note 6. Retirement Plans — Multiemployer Plans” of the Notes to Consolidated Financial Statements section in the Fiscal 2023 Form 10-K for additional information regarding our withdrawal liabilities. We have been named a defendant in asbestos-related personal injury litigation. To date, the costs resulting from the litigation, including settlement costs, have not been significant. As of December 31, 2023, there were approximately 575 such lawsuits. We believe that we have substantial insurance coverage, subject to applicable deductibles and policy limits, with respect to asbestos claims. We also have valid defenses to these asbestos-related personal injury claims and intend to continue to defend them vigorously. Should the volume of litigation grow substantially, it is possible that we could incur significant costs resolving these cases. We do not expect the resolution of pending asbestos litigation and proceedings to have a material adverse effect on our results of operations, financial condition or cash flows. In any given period or periods, however, it is possible such proceedings or matters could have an adverse effect on our results of operations, financial condition or cash flows. At December 31, 2023, we had $14.7 million reserved for these matters. We are a defendant in a number of other lawsuits and claims arising out of the conduct of our business. While the ultimate results of such suits or other proceedings against us cannot be predicted, we believe the resolution of these other matters will not have a material adverse effect on our results of operations, financial condition or cash flows. Indirect Tax Claim In March 2017, the Supreme Court of Brazil issued a decision concluding that certain state value added tax should not be included in the calculation of federal gross receipts taxes. Subsequently, in fiscal 2019 and 2020, the Supreme Court of Brazil rendered favorable decisions on eight of our cases granting us the right to recover certain state value added tax. The tax authorities in Brazil filed a Motion of Clarification with the Supreme Court of Brazil. Based on our evaluation and the opinion of our tax and legal advisors, we believe the decision reduced our gross receipts tax in Brazil prospectively and retrospectively, and will allow us to recover tax amounts collected by the government. Due to the volume of invoices being reviewed (January 2002 to September 2019), we recorded the estimated recoveries across several periods beginning in the fourth quarter of fiscal 2019 as we reviewed the documents and the amount became estimable. In May 2021, the Supreme Court of Brazil judged the Motion of Clarification and concluded on the gross methodology, which was consistent with our evaluation and that of our tax and legal advisors. We are monitoring the status of our remaining cases, and subject to the resolution in the courts, we may record additional amounts in future periods. See “Note 19. Commitments and Contingencies — Indirect Tax Claim” of the Notes to Consolidated Financial Statements section in the Fiscal 2023 Form 10-K for information related to our previously recorded estimated recoveries. Guarantees We make certain guarantees in the normal course of conducting our operations, for compliance with certain laws and regulations, or in connection with certain business transactions. The guarantees include items such as funding of net losses in proportion to our ownership share of certain joint ventures, debt guarantees related to certain unconsolidated entities acquired in acquisitions, indemnifications of lessors in certain facilities and equipment operating leases for items such as additional taxes being assessed due to a change in tax law and certain other agreements. We estimate our exposure to these matters to be less than $50 million. As of December 31, 2023, we had recorded $0.8 million for the estimated fair value of these guarantees. We are unable to estimate our maximum exposure under operating leases because it is dependent on potential changes in tax laws; however, we believe our exposure related to guarantees would not have a material impact on our results of operations, financial condition or cash flows.

Commitments and Contingencies

3 Months Ended

Dec. 31, 2023

Commitments And Contingencies [Abstract]

Note 16. Commitments and Contingencies

Environmental

Environmental compliance requirements are a significant factor affecting our business. Our manufacturing processes are subject to numerous federal, state, local and international environmental laws and regulations, as well as the requirements of environmental permits and similar authorizations issued by various governmental authorities. We have incurred, and expect that we will continue to incur, significant capital, operating and other expenditures complying with applicable environmental laws and regulations. Changes in these laws, as well as litigation relating to these laws, could result in more stringent or additional environmental compliance obligations for the Company that may require additional capital investments or increase our operating costs.

We are involved in various administrative and other proceedings relating to environmental matters that arise in the normal course of business, and we may become involved in similar matters in the future. Although the ultimate outcome of these proceedings cannot be predicted and we cannot at this time estimate any reasonably possible losses based on available information, we do not believe that the currently expected outcome of any environmental proceedings and claims that are pending or threatened against us will have a material adverse effect on our results of operations, financial condition or cash flows.

We face potential liability under federal, state, local and international laws as a result of releases of hazardous substances into the environment from various sites owned and operated by third parties at which Company-generated wastes have allegedly been deposited.

In addition, certain of our current or former locations are being investigated or remediated under various environmental laws, including Comprehensive Environmental Response, Compensation, and Liability Act of 1980 (“CERCLA”). Based on information known to us and assumptions, we do not believe that the costs of any ongoing investigation and remediation projects will have a material adverse effect on our results of operations, financial condition or cash flows. However, the discovery of contamination or the imposition of additional obligations, including investigation or remediation triggered by the closures or sales of former manufacturing facilities may necessitate, and/or natural resources damages at these or other sites in the future, could impact our results of operations, financial condition or cash flows.

See “Note 19. Commitments and Contingencies” of the Notes to Consolidated Financial Statements section in the Fiscal 2023 Form 10-K for information related to environmental matters.

As of December 31, 2023, we had $9.4 million reserved for environmental liabilities on an undiscounted basis, of which $3.3 million is included in Other noncurrent liabilities and $6.1 million is included in Other current liabilities, on the consolidated balance sheets, including amounts accrued in connection with environmental obligations relating to manufacturing facilities that we have closed. We believe the liabilities for these matters was adequately reserved at December 31, 2023.

Climate Change

Climate change presents risks and uncertainties for us. Unpredictable weather patterns or extended periods of severe weather may result in interruptions to our manufacturing operations, as well as supply chain disruptions and increased material costs, such as through impacts to virgin fiber supplies and prices, which may fluctuate during prolonged periods of heavy rain or drought, during tree disease or insect epidemics or other environmental conditions that may be caused by variations in climate conditions. To the extent that severe weather or other climate-related risks materialize, and we are unprepared for them, we may incur unexpected costs, which could have a material effect on our results of operations, cash flows and financial condition, and the trading price of our Common Stock may be adversely impacted.

Responses to climate change may result in regulatory risks as new laws and regulations aimed at reducing greenhouse gas (“GHG”) emissions come into effect. We have systems in place for tracking the GHG emissions from our energy-intensive facilities, and we monitor developments in climate-related laws, regulations and policies to assess the potential impact of such developments on our results of operations, financial condition, cash flows and disclosure obligations. Compliance with climate programs may require future expenditures to meet GHG emission reduction obligations in future years.

See “Note 19. Commitments and Contingencies” of the Notes to Consolidated Financial Statements section in the Fiscal 2023 Form 10-K for information related to climate change.

Brazil Tax Liability

We are challenging claims by the Brazil Federal Revenue Department that we underpaid tax, penalties and interest associated with a claim that a subsidiary of MeadWestvaco Corporation (the predecessor of MWV) had reduced its tax liability related to the goodwill generated by the 2002 merger of two of its Brazilian subsidiaries. The matter has proceeded through the Brazil Administrative Council of Tax Appeals (“CARF”) principally in two proceedings, covering tax years 2003 to 2008 and 2009 to 2012. The tax and interest claim relating to tax years 2009 to 2012 was finalized and is now the subject of an annulment action we filed in the Brazil federal court. CARF notified us of its final decision regarding the tax, penalties and interest claims relating to tax years 2003 to 2008 on June 3, 2020. We have filed an annulment action in Brazil federal court with respect to that decision as well. The dispute related to fraud penalties for tax years 2009 to 2012 was resolved by CARF in favor of WestRock effective January 23, 2023.

We assert that we have no liability in these matters. The total amount in dispute before CARF and in the annulment actions relating to the claimed tax deficiency was R$723 million ($149 million) as of December 31, 2023, including various penalties and interest. The U.S. dollar equivalent has fluctuated significantly due to changes in exchange rates. The amount of our uncertain tax position reserve for this matter, which excludes certain penalties, is included in the unrecognized tax benefits table in our Fiscal 2023 Form 10-K; see “Note 7. Income Taxes” of the

Notes to Consolidated Financial Statements in the Fiscal 2023 Form 10-K for additional information. Resolution of the uncertain tax positions could have a material adverse effect on our cash flows and results of operations or materially benefit our results of operations in future periods depending upon their ultimate resolution.

Other Litigation

During fiscal 2018, we submitted formal notification to withdraw from the PIUMPF and recorded a liability associated with the withdrawal. Subsequently, in fiscal 2019 and 2020, we received demand letters from PIUMPF, including a demand for withdrawal liabilities and for our proportionate share of PIUMPF's accumulated funding deficiency, and we refined our liability, the impact of which was not significant. We began making monthly payments for the PIUMPF withdrawal liabilities in fiscal 2020, excluding the accumulated funding deficiency demands. We dispute the accumulated funding deficiency demands. In February 2020, we received a demand letter from PIUMPF asserting that we owe $51.2 million for our pro-rata share of PIUMPF’s accumulated funding deficiency, including interest. Similarly, in April 2020, we received an updated demand letter related to a subsidiary of ours asserting that we owe $1.3 million of additional accumulated funding deficiency, including interest. The subsidiary for which we received the updated demand letter was sold in September 2023. In July 2021, the PIUMPF filed suit against us in the U.S. District Court for the Northern District of Georgia claiming the right to recover our pro rata share of the pension fund’s accumulated funding deficiency, along with interest, liquidated damages and attorney's fees. We believe we are adequately reserved for this matter. See “Note 6. Retirement Plans — Multiemployer Plans” of the Notes to Consolidated Financial Statements section in the Fiscal 2023 Form 10-K for additional information regarding our withdrawal liabilities.

We have been named a defendant in asbestos-related personal injury litigation. To date, the costs resulting from the litigation, including settlement costs, have not been significant. As of December 31, 2023, there were approximately 575 such lawsuits. We believe that we have substantial insurance coverage, subject to applicable deductibles and policy limits, with respect to asbestos claims. We also have valid defenses to these asbestos-related personal injury claims and intend to continue to defend them vigorously. Should the volume of litigation grow substantially, it is possible that we could incur significant costs resolving these cases. We do not expect the resolution of pending asbestos litigation and proceedings to have a material adverse effect on our results of operations, financial condition or cash flows. In any given period or periods, however, it is possible such proceedings or matters could have an adverse effect on our results of operations, financial condition or cash flows. At December 31, 2023, we had $14.7 million reserved for these matters.

We are a defendant in a number of other lawsuits and claims arising out of the conduct of our business. While the ultimate results of such suits or other proceedings against us cannot be predicted, we believe the resolution of these other matters will not have a material adverse effect on our results of operations, financial condition or cash flows.

Indirect Tax Claim

In March 2017, the Supreme Court of Brazil issued a decision concluding that certain state value added tax should not be included in the calculation of federal gross receipts taxes. Subsequently, in fiscal 2019 and 2020, the Supreme Court of Brazil rendered favorable decisions on eight of our cases granting us the right to recover certain state value added tax. The tax authorities in Brazil filed a Motion of Clarification with the Supreme Court of Brazil. Based on our evaluation and the opinion of our tax and legal advisors, we believe the decision reduced our gross receipts tax in Brazil prospectively and retrospectively, and will allow us to recover tax amounts collected by the government. Due to the volume of invoices being reviewed (January 2002 to September 2019), we recorded the estimated recoveries across several periods beginning in the fourth quarter of fiscal 2019 as we reviewed the documents and the amount became estimable. In May 2021, the Supreme Court of Brazil judged the Motion of Clarification and concluded on the gross methodology, which was consistent with our evaluation and that of our tax and legal advisors. We are monitoring the status of our remaining cases, and subject to the resolution in the courts, we may record additional amounts in future periods.

See “Note 19. Commitments and Contingencies — Indirect Tax Claim” of the Notes to Consolidated Financial Statements section in the Fiscal 2023 Form 10-K for information related to our previously recorded estimated recoveries.

Guarantees

We make certain guarantees in the normal course of conducting our operations, for compliance with certain laws and regulations, or in connection with certain business transactions. The guarantees include items such as funding of net losses in proportion to our ownership share of certain joint ventures, debt guarantees related to certain unconsolidated entities acquired in acquisitions, indemnifications of lessors in certain facilities and equipment operating leases for items such as additional taxes being assessed due to a change in tax law and certain other agreements. We estimate our exposure to these matters to be less than $50 million. As of December 31, 2023, we had recorded $0.8 million for the estimated fair value of these guarantees. We are unable to estimate our maximum exposure under operating leases because it is dependent on potential changes in tax laws; however, we believe our exposure related to guarantees would not have a material impact on our results of operations, financial condition or cash flows.