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Business Combinations (Narrative) (Details) $ / shares in Units, £ in Millions							12 Months Ended
	Jan. 03, 2023 USD ($) shares	Nov. 07, 2022 USD ($) $ / shares shares	May 04, 2022	Nov. 02, 2021 USD ($)	Aug. 09, 2021 USD ($)	Aug. 09, 2021 GBP (£)	Dec. 31, 2022 USD ($)	Jan. 31, 2023 $ / shares	Dec. 09, 2022 USD ($)
IAA
Business Acquisition [Line Items]
Cash consideration per share		$ 12.80
Shares issued per share | shares		0.5252
Common stock consideration (in shares) | shares		70,300,000
Cash consideration		$ 1,700,000,000
Assumption of net debt		$ 1,200,000,000
Special dividend per share contingent upon completion of merger agreement | $ / shares		$ 1.08						$ 1.08
Termination amount required to be paid to the other party In case of termination		$ 189,000,000.0
Aggregate amount required to reimburse for its out-of-pocket expenses		$ 5,000,000.0
IAA | Existing Stockholders [Member]
Business Acquisition [Line Items]
Voting equity interests owned, percentage		59.00%
IAA | IAA Shareholders [Member]
Business Acquisition [Line Items]
Voting equity interests owned, percentage		37.00%
IAA | Starboard Value LP and certain of its affiliates [Member]
Business Acquisition [Line Items]
Voting equity interests owned, percentage		4.00%
SmartEquip [Member]
Business Acquisition [Line Items]
Total consideration				$ 173,806,000
Increased in purchase price due to adjustment in net working capital adjustment							$ 100,000
Total purchase price				173,700,000			173,800,000
Deferred tax asset decreased, adjustment to goodwill							3,800,000
Deferred tax assets				5,098,000			$ 5,100,000
Deferred tax assets, net of valuation allowance				$ 900,000
Euro Auctions Limited [Member]
Business Acquisition [Line Items]
Cash consideration under the terms of the SPA, to be paid on closing					$ 1,020,000,000.00	£ 775.0
Subsequent Event [Member] | VeriTread
Business Acquisition [Line Items]
Cash consideration	$ 3,000,000.0
Voting equity interests owned, percentage								11.00%
Number of shares acquired | shares	1,056,338
Prior holdings of issued and outstanding shares (as a percent)	11.00%
Aggregate holdings of issued and outstanding shares (as a percent)	75.00%							75.00%
Subsequent Event [Member] | VeriTread | Existing Stockholders [Member]
Business Acquisition [Line Items]
Number of shares acquired | shares	8,889,766
Total consideration	$ 25,000,000.0
2021 USD Notes [Member]
Business Acquisition [Line Items]
Redemption price percentage			100.00%
Maximum [Member] | Term LoanA Facility [Member]
Business Acquisition [Line Items]
Aggregate principal amount									$ 1,800,000,000
Maximum [Member] | Bridge Loan Facility
Business Acquisition [Line Items]
Aggregate principal amount		$ 2,800,000,000
Maximum [Member] | Backstop Revolving Facility
Business Acquisition [Line Items]
Aggregate principal amount		$ 750,000,000.0

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