Basis of Presentation and Nature of Operations	3 Months Ended
Mar. 29, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation and Nature of Operations	Basis of Presentation and Nature of Operations Description of Business IAA, Inc., together with its subsidiaries (collectively referred to herein as “IAA” and "the Company") is a leading provider of auction solutions for total loss, damaged and low-value vehicles in North America and the United Kingdom. The Company facilitates the marketing and sale of total loss, damaged and low-value vehicles for a full spectrum of sellers. The Company's solutions, which are focused on a diverse set of global customers, provide buyers with the vehicles they need to, among other things, fulfill their vehicle rebuild requirements, replacement part inventory or scrap demand. The Company operates in two reportable segments: United States and International. The Company earns fees for its services from both buyers and sellers of vehicles sold through its channels. Approximately two-thirds of the Company's revenue is earned from buyers and one-third of the revenue is earned from vehicle suppliers or sellers. The Company operates over 200 sites across the United States, Canada and the United Kingdom, representing total acreage of approximately 8,100 gross acres. Most of the Company's properties are leased and used primarily for auction and storage purposes. Separation and Distribution On February 27, 2018, KAR Auction Services, Inc. (“KAR” or “ Former Parent”), a Delaware corporation, announced a plan to pursue the separation and spin-off (the “Separation”) of its salvage auction business into a separate public company, IAA Spinco Inc. IAA Spinco Inc. was incorporated in Delaware on June 19, 2018 and was renamed IAA, Inc. on June 27, 2019. On June 28, 2019 (the "Separation Date"), KAR completed the distribution of 100% of the issued and outstanding shares of common stock of IAA to the holders of record of KAR's common stock on June 18, 2019, on a pro rata basis (the "Distribution"). On the Separation Date, each KAR common stockholder of record received one share of IAA common stock for every one share of KAR common stock held by such stockholder as of the record date. As a result of the Distribution, KAR does not retain any ownership interest in IAA. The Distribution was made pursuant to the Separation and Distribution Agreement, dated June 27, 2019 (the "Separation and Distribution Agreement"), pursuant to which KAR contributed the subsidiaries that operated the salvage auction business to IAA. The Distribution is expected to be a tax-free transaction under provisions of the Internal Revenue Code. Following the Distribution, IAA became an independent publicly-traded company and is listed on the New York Stock Exchange under the symbol “IAA.” In connection with the Separation, on the Separation Date, the Company paid a dividend to KAR of $1,278.0 million, which included $456.6 million to settle intercompany debt and $40.9 million for certain fixed assets transferred to the Company by KAR on the Separation Date. The Company also paid KAR $117.8 million on the Separation Date to settle other intercompany accounts in connection with the Separation. In connection with the Separation, the Company also entered into a non-compete and various other ancillary agreements to effect the Separation and provide a framework for the Company's relationship with KAR after the Separation, including a transition services agreement, a tax matters agreement and an employee matters agreement. These agreements provide for the allocation of assets, employees, liabilities and obligations attributable to periods prior to, at and after the Company's Separation from KAR and govern certain relationships between the Company and KAR after the Separation. For further information regarding these agreements, see Note 2 - Relationship with KAR and Related Entities. Basis of Presentation Until the Separation Date, the Company operated as a separate reportable segment within KAR and, since the Separation Date, the Company has operated independently from KAR. The accompanying unaudited consolidated financial statements for the three months ended March 31, 2019 and condensed notes related thereto have been prepared from KAR’s historical accounting records and are presented on a stand-alone basis as if IAA's operations had been conducted independently from KAR for all periods prior to the Separation Date. Accordingly, prior to the Separation Date, KAR’s net investment in these operations (Net Parent Investment) was shown in lieu of stockholder’s (deficit) equity in the unaudited consolidated financial statements. The Company's historical results of operations, financial position and cash flows presented in the unaudited consolidated financial statements may not be indicative of what they would have been had the Company actually been a separate stand-alone entity during such periods, nor are they necessarily indicative of the Company's future results of operations, financial position and cash flows. IAA is comprised of certain stand-alone legal entities for which discrete financial information is available. The unaudited consolidated statements of income include all revenues and costs directly attributable to IAA, including costs for functions and services used by the Company. Prior to the Separation Date, certain shared costs were directly charged to the Company by KAR based on specific identification or other allocation methods. The Company's results of operations prior to the Separation Date also include allocations of costs for administrative functions and services performed on behalf of the Company by centralized staff groups within KAR. Current and deferred income taxes and related tax expense have been determined based on the Company's stand-alone results by applying Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) 740, Income Taxes, to the Company's operations in each country as if the Company was a separate taxpayer (i.e., following the separate return methodology). Allocation methodologies were applied to certain shared costs to allocate amounts to the Company as discussed further in Note 2 - Relationship with KAR and Related Entities. The accompanying unaudited consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States of America ("U.S. GAAP") for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and notes required by U.S. GAAP for annual financial statements. Operating results for interim periods are not necessarily indicative of results that may be expected for the year as a whole. In the opinion of management, the unaudited consolidated financial statements reflect all adjustments, generally consisting of normal recurring accruals, necessary for a fair statement of our results of operations, cash flows and financial position for the periods presented. These unaudited consolidated financial statements and condensed notes thereto are unaudited and should be read in conjunction with the audited consolidated financial statements and notes thereto, for the year ended December 29, 2019 included in the Company's Annual Report on Form 10-K filed with the Securities and Exchange Commission (the "SEC") on March 18, 2020. Fiscal Periods On June 27, 2019, the Company's board of directors set the fiscal year to end on the last Sunday in December in each year, consisting of either 52 or 53 weeks. Each of fiscal 2019 and fiscal 2020 contain 52 weeks. Use of Estimates The accompanying unaudited consolidated financial statements have been prepared in accordance with U.S. GAAP. The preparation of the consolidated financial statements in conformity with U.S. GAAP requires management to make estimates based in part on assumptions about current, and for some estimates, future economic and market conditions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenues and expenses during the period. Although the current estimates contemplate current conditions and expected future changes, as appropriate, it is reasonably possible that future conditions could differ from these estimates, which could materially affect the Company's results of operations and financial position. Among other effects, such changes could result in future impairments of goodwill, intangible assets and long-lived assets, additional allowances on accounts receivable and deferred tax assets and changes in litigation and other loss contingencies. Reclassification Certain amounts reported in the Company's Registration Statement on Form 10 filed with the SEC on June 13, 2019 have been reclassified to conform to the current year’s presentation. The reclassification is related to the presentation of outstanding checks of one of the Company's subsidiaries. The reclassification reduced cash and cash equivalents by $11.7 million, and decreased other accrued expenses by the same amount at December 30, 2018, and reduced cash and cash equivalents by $10.4 million and decreased other accrued expenses by the same amount at March 31, 2019. As a result of this reclassification, certain line items have been amended in the Consolidated Statements of Cash Flows. Recent Accounting Pronouncements Recently Issued and Adopted Accounting Pronouncements In August 2018, the FASB issued Accounting Standards Update ("ASU") 2018-15, Intangibles - Goodwill and Other - Internal-Use Software (Subtopic 350-40): Customer's Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That is a Service Contract, which aligns the requirements for capitalizing implementation costs incurred in a cloud computing arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software. The adoption of ASU 2018-15 on December 30, 2019 did not have a material impact on the Company's consolidated financial statements. In January 2017, the FASB issued ASU 2017-4, Intangibles-Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment, which simplifies the test for goodwill impairment by eliminating Step 2 (implied fair value measurement). Instead goodwill impairment would be measured as the amount by which a reporting unit's carrying amount exceeds its fair value, not to exceed the carrying amount of goodwill. The adoption of ASU 2017-4 on December 30, 2019 did not have a material impact on the Company's consolidated financial statements. In June 2016, the FASB issued ASU 2016-13, Financial Instruments - Credit Losses (Topic 326), which updates the guidance related to the measurement of credit losses on financial instruments, including trade receivables. This ASU requires the recognition of credit losses on financial instruments based on an estimate of expected losses, replacing the incurred loss model in the prior guidance. The adoption of ASU 2016-13 on December 30, 2019 did not have a material impact on the Company's consolidated financial statements. Recently Issued Accounting Pronouncements Not Yet Adopted The Company does not believe that any recently issued, but not yet effective, accounting pronouncements, if adopted, would have a material impact on its unaudited consolidated financial statements or disclosures.

Basis of Presentation and Nature of Operations

Description of Business

IAA, Inc., together with its subsidiaries (collectively referred to herein as “IAA” and "the Company") is a leading provider of auction solutions for total loss, damaged and low-value vehicles in North America and the United Kingdom. The Company facilitates the marketing and sale of total loss, damaged and low-value vehicles for a full spectrum of sellers. The Company's solutions, which are focused on a diverse set of global customers, provide buyers with the vehicles they need to, among other things, fulfill their vehicle rebuild requirements, replacement part inventory or scrap demand. The Company operates in two reportable segments: United States and International.

The Company earns fees for its services from both buyers and sellers of vehicles sold through its channels. Approximately two-thirds of the Company's revenue is earned from buyers and one-third of the revenue is earned from vehicle suppliers or sellers. The Company operates over 200 sites across the United States, Canada and the United Kingdom, representing total acreage of approximately 8,100 gross acres. Most of the Company's properties are leased and used primarily for auction and storage purposes.

Separation and Distribution

On February 27, 2018, KAR Auction Services, Inc. (“KAR” or “ Former Parent”), a Delaware corporation, announced a plan to pursue the separation and spin-off (the “Separation”) of its salvage auction business into a separate public company, IAA Spinco Inc. IAA Spinco Inc. was incorporated in Delaware on June 19, 2018 and was renamed IAA, Inc. on June 27, 2019. On June 28, 2019 (the "Separation Date"), KAR completed the distribution of 100% of the issued and outstanding shares of common stock of IAA to the holders of record of KAR's common stock on June 18, 2019, on a pro rata basis (the "Distribution"). On the Separation Date, each KAR common stockholder of record received one share of IAA common stock for every one share of KAR common stock held by such stockholder as of the record date. As a result of the Distribution, KAR does not retain any ownership interest in IAA. The Distribution was made pursuant to the Separation and Distribution Agreement, dated June 27, 2019 (the "Separation and Distribution Agreement"), pursuant to which KAR contributed the subsidiaries that operated the salvage auction business to IAA. The Distribution is expected to be a tax-free transaction under provisions of the Internal Revenue Code. Following the Distribution, IAA became an independent publicly-traded company and is listed on the New York Stock Exchange under the symbol “IAA.”

In connection with the Separation, on the Separation Date, the Company paid a dividend to KAR of $1,278.0 million, which included $456.6 million to settle intercompany debt and $40.9 million for certain fixed assets transferred to the Company by KAR on the Separation Date. The Company also paid KAR $117.8 million on the Separation Date to settle other intercompany accounts in connection with the Separation.

In connection with the Separation, the Company also entered into a non-compete and various other ancillary agreements to effect the Separation and provide a framework for the Company's relationship with KAR after the Separation, including a transition services agreement, a tax matters agreement and an employee matters agreement. These agreements provide for the allocation of assets, employees, liabilities and obligations attributable to periods prior to, at and after the Company's Separation from KAR and govern certain relationships between the Company and KAR after the Separation. For further information regarding these agreements, see Note 2 - Relationship with KAR and Related Entities.

Basis of Presentation

Until the Separation Date, the Company operated as a separate reportable segment within KAR and, since the Separation Date, the Company has operated independently from KAR. The accompanying unaudited consolidated financial statements for the three months ended March 31, 2019 and condensed notes related thereto have been prepared from KAR’s historical accounting records and are presented on a stand-alone basis as if IAA's operations had been conducted independently from KAR for all periods prior to the Separation Date. Accordingly, prior to the Separation Date, KAR’s net investment in these operations (Net Parent Investment) was shown in lieu of stockholder’s (deficit) equity in the unaudited consolidated financial statements. The Company's historical results of operations, financial position and cash flows presented in the unaudited consolidated financial statements may not be indicative of what they would have been had the Company actually been a separate stand-alone entity during such periods, nor are they necessarily indicative of the Company's future results of operations, financial position and cash flows.

IAA is comprised of certain stand-alone legal entities for which discrete financial information is available. The unaudited consolidated statements of income include all revenues and costs directly attributable to IAA, including costs for functions and services used by the Company. Prior to the Separation Date, certain shared costs were directly charged to the Company by KAR based on specific identification or other allocation methods. The Company's results of operations prior to the Separation Date also include allocations of costs for administrative functions and services performed on behalf of the Company by centralized staff groups within KAR. Current and deferred income taxes and related tax expense have been determined based on the Company's stand-alone results by applying Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) 740, Income Taxes, to the Company's operations in each country as if the Company was a separate taxpayer (i.e., following the separate return methodology). Allocation methodologies were applied to certain shared costs to allocate amounts to the Company as discussed further in Note 2 - Relationship with KAR and Related Entities.

The accompanying unaudited consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States of America ("U.S. GAAP") for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and notes required by U.S. GAAP for annual financial statements. Operating results for interim periods are not necessarily indicative of results that may be expected for the year as a whole. In the opinion of management, the unaudited consolidated financial statements reflect all adjustments, generally consisting of normal recurring accruals, necessary for a fair statement of our results of operations, cash flows and financial position for the periods presented. These unaudited consolidated financial statements and condensed notes thereto are unaudited and should be read in conjunction with the audited consolidated financial statements and notes thereto, for the year ended December 29, 2019 included in the Company's Annual Report on Form 10-K filed with the Securities and Exchange Commission (the "SEC") on March 18, 2020.

Fiscal Periods

On June 27, 2019, the Company's board of directors set the fiscal year to end on the last Sunday in December in each year, consisting of either 52 or 53 weeks. Each of fiscal 2019 and fiscal 2020 contain 52 weeks.

Use of Estimates

The accompanying unaudited consolidated financial statements have been prepared in accordance with U.S. GAAP. The preparation of the consolidated financial statements in conformity with U.S. GAAP requires management to make estimates based in part on assumptions about current, and for some estimates, future economic and market conditions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenues and expenses during the period. Although the current estimates contemplate current conditions and expected future changes, as appropriate, it is reasonably possible that future conditions could differ from these estimates, which could materially affect the Company's results of operations and financial position. Among other effects, such changes could result in future impairments of goodwill, intangible assets and long-lived assets, additional allowances on accounts receivable and deferred tax assets and changes in litigation and other loss contingencies.

Reclassification

Certain amounts reported in the Company's Registration Statement on Form 10 filed with the SEC on June 13, 2019 have been reclassified to conform to the current year’s presentation. The reclassification is related to the presentation of outstanding checks of one of the Company's subsidiaries. The reclassification reduced cash and cash equivalents by $11.7 million, and decreased other accrued expenses by the same amount at December 30, 2018, and reduced cash and cash equivalents by $10.4 million and decreased other accrued expenses by the same amount at March 31, 2019. As a result of this reclassification, certain line items have been amended in the Consolidated Statements of Cash Flows.

Recent Accounting Pronouncements

Recently Issued and Adopted Accounting Pronouncements

In August 2018, the FASB issued Accounting Standards Update ("ASU") 2018-15, Intangibles - Goodwill and Other - Internal-Use Software (Subtopic 350-40): Customer's Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That is a Service Contract, which aligns the requirements for capitalizing implementation costs incurred in a cloud computing arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software. The adoption of ASU 2018-15 on December 30, 2019 did not have a material impact on the Company's consolidated financial statements.

In January 2017, the FASB issued ASU 2017-4, Intangibles-Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment, which simplifies the test for goodwill impairment by eliminating Step 2 (implied fair value measurement). Instead goodwill impairment would be measured as the amount by which a reporting unit's carrying amount exceeds its fair value, not to exceed the carrying amount of goodwill. The adoption of ASU 2017-4 on December 30, 2019 did not have a material impact on the Company's consolidated financial statements.

In June 2016, the FASB issued ASU 2016-13, Financial Instruments - Credit Losses (Topic 326), which updates the guidance related to the measurement of credit losses on financial instruments, including trade receivables. This ASU requires the recognition of credit losses on financial instruments based on an estimate of expected losses, replacing the incurred loss model in the prior guidance. The adoption of ASU 2016-13 on December 30, 2019 did not have a material impact on the Company's consolidated financial statements.

Recently Issued Accounting Pronouncements Not Yet Adopted

The Company does not believe that any recently issued, but not yet effective, accounting pronouncements, if adopted, would have a material impact on its unaudited consolidated financial statements or disclosures.