BASIS OF PRESENTATION	3 Months Ended
Mar. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
BASIS OF PRESENTATION	BASIS OF PRESENTATION The accompanying (a) Condensed Consolidated Balance Sheet of Regal Beloit Corporation (the “Company”) as of December 29, 2018, which has been derived from audited Consolidated Financial Statements, and (b) unaudited interim Condensed Consolidated Financial Statements as of March 30, 2019 and for the three months ended March 30, 2019 and March 31, 2018, have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission. Certain information and note disclosures normally included in annual financial statements prepared in accordance with accounting principles generally accepted in the United States of America ("GAAP"), have been condensed or omitted pursuant to those rules and regulations, although the Company believes that the disclosures made are adequate to make the information not misleading. It is suggested that these Condensed Consolidated Financial Statements be read in conjunction with the Consolidated Financial Statements and the Notes thereto included in the Company’s 2018 Annual Report on Form 10-K filed on February 26, 2019. In the opinion of management, all adjustments considered necessary for a fair presentation of financial results have been made. Except as otherwise discussed, such adjustments consist of only those of a normal recurring nature. Operating results for the three months ended March 30, 2019 are not necessarily indicative of the results that may be expected for the entire fiscal year ending December 28, 2019. The Condensed Consolidated Financial Statements have been prepared in accordance with GAAP, which requires the Company to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the Condensed Consolidated Financial Statements and revenues and expenses during the periods reported. Actual results could differ from those estimates. The Company uses estimates in accounting for, among other items, allowance for doubtful accounts; excess and obsolete inventory; share-based compensation; acquisitions; product warranty obligations; pension and post retirement assets and liabilities; derivative fair values; goodwill and other asset impairments; health care reserves; retirement benefits; rebates and incentives; litigation claims and contingencies, including environmental matters; and income taxes. The Company accounts for changes to estimates and assumptions when warranted by factually based experience. The Company operates on a 52/53 week fiscal year ending on the Saturday closest to December 31. New Accounting Standards In August 2018, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2018-14, Compensation - Retirement Benefits - Defined Benefit Plans - General (Subtopic 715-20). The ASU addresses modifications to the disclosure requirements for Defined Benefit Plans. Under ASU 2018-14 the disclosure requirements that can be removed are amounts in accumulated other comprehensive income expected to be recognized as components of net periodic benefit cost over the next fiscal year, amount and timing of plan assets expected to be returned to the employer, and the effects of a one-percentage-point change in assumed health care cost trend rates on the aggregate of the service and interest cost components of net periodic benefit costs and benefit obligations for postretirement health care benefits. Additional disclosures are required for the weighted -average interest crediting rates for cash balance plans and other plans with promised interest crediting rates and an explanation for significant gains and losses related to the changes in the benefit obligation for the period. If a defined benefit pension plan has a projected benefit obligation greater than plan assets the projected benefit obligation and fair value of plan assets should be disclosed. This additional disclosure is also required when comparing the accumulated benefit obligation to plan assets. This ASU becomes effective for fiscal years ending after December 15, 2020 on a retrospective basis for all years presented. Early adoption is permitted. The Company is evaluating the effect of adopting this new accounting guidance. In August 2018, the FASB issued ASU 2018-13, Fair Value Measurement (Topic 820) - Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement. The ASU focuses on updates around disclosures of Level 3 fair value measurements and it presents modifications to current disclosure requirements. The additional requirements under this ASU include disclosure for the changes in unrealized gains and losses included in other comprehensive income ("OCI") held at the end of the reporting period and the range and weighted average used to develop significant unobservable inputs. The ASU is also eliminating the disclosure requirement for the amount and reason for transfers between Level 1 and Level 2 fair value measurement, valuation processes for Level 3 measurements, and policy for timing of transfers between levels of the fair value hierarchy. In addition, the ASU is modifying the disclosure requirements for investments in certain entities that calculate net asset value, the Company is required to disclosure the timing of liquidation of an investee's assets when a net asset value calculation is used and the date when the restrictions from redemption might lapse only when it has been announced within the Company or publicly. The amendments clarify that the measurement uncertainty disclosure is to communicate information about the uncertainty in measurement as of the reporting date. This ASU is effective for fiscal years beginning after December 15, 2019, including interim periods therein. Early adoption is permitted for any eliminated or modified disclosures upon issuance of this ASU. The ASU requires prospective application for only the most recent interim or annual period presented in the year of adoption for changes in unrealized gains and losses included in OCI, the range and weighted average used to develop significant unobservable inputs for Level 3 fair value measurements, and the narrative description of measurement uncertainty. All other amendments described in this ASU must be applied retrospectively to all periods presented. The Company is evaluating the effect of adopting this new accounting guidance, but does not anticipate a material impact on the financial statement disclosures. In August 2017, the FASB issued ASU 2017-12, Derivatives and Hedging (Topic 815) - Targeted Improvements to Accounting for Hedging Activities. The amendments in this update better align an entity’s risk management activities and financial reporting for hedging relationships through changes to both the designation and measurement guidance for qualifying hedging relationships and the presentation of hedge results. The Company adopted this ASU as of December 30, 2018, the beginning of fiscal 2019, with no material impact on the Company's Condensed Consolidated Financial Statements. In February 2016, the FASB issued ASU 2016-02, Leases. The core principle of ASU 2016-02 is that an entity should recognize assets and liabilities arising from an operating lease on its Balance Sheet. In accordance with that principle, ASU 2016-02 requires that a lessee recognize a liability to make lease payments, the lease liability, and a right-of-use asset representing its right to use the underlying leased asset for the lease term. The recognition, measurement, and presentation of expenses and cash flows arising from a lease by a lessee will depend on the lease classification as a finance or operating lease. In July 2018, the FASB amended its guidance by issuing ASU 2018-11 to provide an additional transition method, allowing a cumulative effect adjustment to the opening balance of Retained Earnings during the period of adoption. The Company adopted the standard as of December 30, 2018, the beginning of fiscal 2019, under the modified retrospective method. Comparative periods presented in the Condensed Consolidated Financial Statements continue to be presented as previously filed. The Company elected the package of practical expedients permitted under the relief package within the new standard allows the Company to carryforward the historical lease accounting of expired or existing leases with respect to lease identification, lease classification and accounting treatment for initial direct costs as of the adoption date. The Company also elected the practical expedient related to lease versus non-lease components, allowing the Company to recognize lease and non-lease components as a single lease. Adoption of the new standard resulted in the recording of right-of-use assets and lease liabilities of $93.0 million as of December 30, 2018. No cumulative effect adjustment to Retained Earnings was recognized upon adoption of the new standard. The standard did not materially impact the Company's consolidated net income and had no impact on cash flows. See Note 9 for additional disclosures.

BASIS OF PRESENTATION

The accompanying (a) Condensed Consolidated Balance Sheet of Regal Beloit Corporation (the “Company”) as of December 29, 2018, which has been derived from audited Consolidated Financial Statements, and (b) unaudited interim Condensed Consolidated Financial Statements as of March 30, 2019 and for the three months ended March 30, 2019 and March 31, 2018, have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission. Certain information and note disclosures normally included in annual financial statements prepared in accordance with accounting principles generally accepted in the United States of America ("GAAP"), have been condensed or omitted pursuant to those rules and regulations, although the Company believes that the disclosures made are adequate to make the information not misleading.

It is suggested that these Condensed Consolidated Financial Statements be read in conjunction with the Consolidated Financial Statements and the Notes thereto included in the Company’s 2018 Annual Report on Form 10-K filed on February 26, 2019.

In the opinion of management, all adjustments considered necessary for a fair presentation of financial results have been made. Except as otherwise discussed, such adjustments consist of only those of a normal recurring nature. Operating results for the three months ended March 30, 2019 are not necessarily indicative of the results that may be expected for the entire fiscal year ending December 28, 2019.

The Condensed Consolidated Financial Statements have been prepared in accordance with GAAP, which requires the Company to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the Condensed Consolidated Financial Statements and revenues and expenses during the periods reported. Actual results could differ from those estimates. The Company uses estimates in accounting for, among other items, allowance for doubtful accounts; excess and obsolete inventory; share-based compensation; acquisitions; product warranty obligations; pension and post retirement assets and liabilities; derivative fair values; goodwill and other asset impairments; health care reserves; retirement benefits; rebates and incentives; litigation claims and contingencies, including environmental matters; and income taxes. The Company accounts for changes to estimates and assumptions when warranted by factually based experience.

The Company operates on a 52/53 week fiscal year ending on the Saturday closest to December 31.

New Accounting Standards

In August 2018, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2018-14, Compensation - Retirement Benefits - Defined Benefit Plans - General (Subtopic 715-20). The ASU addresses modifications to the disclosure requirements for Defined Benefit Plans. Under ASU 2018-14 the disclosure requirements that can be removed are amounts in accumulated other comprehensive income expected to be recognized as components of net periodic benefit cost over the next fiscal year, amount and timing of plan assets expected to be returned to the employer, and the effects of a one-percentage-point change in assumed health care cost trend rates on the aggregate of the service and interest cost components of net periodic benefit costs and benefit obligations for postretirement health care benefits. Additional disclosures are required for the weighted -average interest crediting rates for cash balance plans and other plans with promised interest crediting rates and an explanation for significant gains and losses related to the changes in the benefit obligation for the period. If a defined benefit pension plan has a projected benefit obligation greater than plan assets the projected benefit obligation and fair value of plan assets should be disclosed. This additional disclosure is also required when comparing the accumulated benefit obligation to plan assets. This ASU becomes effective for fiscal years ending after December 15, 2020 on a retrospective basis for all years presented. Early adoption is permitted. The Company is evaluating the effect of adopting this new accounting guidance.

In August 2018, the FASB issued ASU 2018-13, Fair Value Measurement (Topic 820) - Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement. The ASU focuses on updates around disclosures of Level 3 fair value measurements and it presents modifications to current disclosure requirements. The additional requirements under this ASU include disclosure for the changes in unrealized gains and losses included in other comprehensive income ("OCI") held at the end of the reporting period and the range and weighted average used to develop significant unobservable inputs. The ASU is also eliminating the disclosure requirement for the amount and reason for transfers between Level 1 and Level 2 fair value measurement, valuation processes for Level 3 measurements, and policy for timing of transfers between levels of the fair value hierarchy. In addition, the ASU is modifying the disclosure requirements for investments in certain entities that calculate net asset value, the Company is required to disclosure the timing of liquidation of an investee's assets when a net asset value calculation is used and the date when the restrictions from redemption might lapse only when it has been announced within the Company or publicly. The amendments clarify that the measurement uncertainty disclosure is to communicate information about the uncertainty in measurement as of the reporting date. This ASU is effective for fiscal years beginning after December 15, 2019, including interim periods therein. Early adoption is permitted for any eliminated or modified disclosures upon issuance of this ASU. The ASU requires prospective application for only the most recent interim or annual period presented in the year of adoption for changes in unrealized gains and losses included in OCI, the range and weighted average used to develop significant unobservable inputs for Level 3 fair value measurements, and the narrative description of measurement uncertainty. All other amendments described in this ASU must be applied retrospectively to all periods presented. The Company is evaluating the effect of adopting this new accounting guidance, but does not anticipate a material impact on the financial statement disclosures.

In August 2017, the FASB issued ASU 2017-12, Derivatives and Hedging (Topic 815) - Targeted Improvements to Accounting for Hedging Activities. The amendments in this update better align an entity’s risk management activities and financial reporting for hedging relationships through changes to both the designation and measurement guidance for qualifying hedging relationships and the presentation of hedge results. The Company adopted this ASU as of December 30, 2018, the beginning of fiscal 2019, with no material impact on the Company's Condensed Consolidated Financial Statements.

In February 2016, the FASB issued ASU 2016-02, Leases. The core principle of ASU 2016-02 is that an entity should recognize assets and liabilities arising from an operating lease on its Balance Sheet. In accordance with that principle, ASU 2016-02 requires that a lessee recognize a liability to make lease payments, the lease liability, and a right-of-use asset representing its right to use the underlying leased asset for the lease term. The recognition, measurement, and presentation of expenses and cash flows arising from a lease by a lessee will depend on the lease classification as a finance or operating lease. In July 2018, the FASB amended its guidance by issuing ASU 2018-11 to provide an additional transition method, allowing a cumulative effect adjustment to the opening balance of Retained Earnings during the period of adoption. The Company adopted the standard as of December 30, 2018, the beginning of fiscal 2019, under the modified retrospective method. Comparative periods presented in the Condensed Consolidated Financial Statements continue to be presented as previously filed.

The Company elected the package of practical expedients permitted under the relief package within the new standard allows the Company to carryforward the historical lease accounting of expired or existing leases with respect to lease identification, lease classification and accounting treatment for initial direct costs as of the adoption date. The Company also elected the practical expedient related to lease versus non-lease components, allowing the Company to recognize lease and non-lease components as a single lease.

Adoption of the new standard resulted in the recording of right-of-use assets and lease liabilities of $93.0 million as of December 30, 2018. No cumulative effect adjustment to Retained Earnings was recognized upon adoption of the new standard. The standard did not materially impact the Company's consolidated net income and had no impact on cash flows. See Note 9 for additional disclosures.