Acquisitions - Narrative (Details) - USD ($) $ in Thousands	1 Months Ended		3 Months Ended		6 Months Ended
	Jan. 31, 2024	Dec. 31, 2023	Mar. 02, 2024	Mar. 04, 2023	Mar. 02, 2024	Mar. 04, 2023	Sep. 02, 2023
Business Acquisition [Line Items]
Goodwill			$ 722,101		$ 722,101		$ 718,174
Income before provision for income taxes			79,955	$ 106,178	171,273	$ 214,029
Revenue			935,348	$ 961,632	1,889,317	$ 1,919,377
KAR Industrial Inc
Business Acquisition [Line Items]
Business acquisition, percentage of voting interests acquired	100.00%
Total purchase price consideration	$ 8,903
Payments to acquire businesses, gross	8,303
Business combination, contingent consideration, liability	747
Business combination, contingent consideration, liability, present value	600
Identifiable intangibles	971
Goodwill	$ 3,885
Income before provision for income taxes			99		99
Revenue			2,476		2,476
Business combination, integration related costs			$ 465		$ 465
KAR Industrial Inc | Customer Relationships
Business Acquisition [Line Items]
Acquired finite-lived intangible assets, weighted average useful life	10 years
Identifiable intangibles	$ 747
KAR Industrial Inc | Trade Names
Business Acquisition [Line Items]
Acquired finite-lived intangible assets, weighted average useful life	5 years
Finite-lived intangible assets acquired	$ 224
SMRT Asset Acquisition
Business Acquisition [Line Items]
Asset acquisition, consideration transferred		$ 2,894
Asset acquisition, consideration transferred, transaction cost		145
Asset acquisition, consideration transferred, contingent consideration		$ 1,200
Acquired finite-lived intangible assets, weighted average useful life					5 years