Summary of Significant Accounting Policies - Narrative (Details) $ in Millions	3 Months Ended		9 Months Ended	12 Months Ended
	Dec. 29, 2019 USD ($) segment	Sep. 29, 2019 segment	Sep. 29, 2019 segment	Dec. 29, 2019 USD ($) segment	Dec. 30, 2018 USD ($)	Dec. 31, 2017 USD ($)	Jan. 01, 2019 USD ($)	Jan. 01, 2018 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reduction to cash and cash equivalents	$ (47.1)			$ (47.1)	$ (48.3)
Reduction to other accrued expenses	$ (49.3)			$ (49.3)	(44.1)
Number of operating segments | segment	2	2	1
Number of reportable segments | segment	2		1	2
Foreign currency transaction gains and (losses)				$ (0.2)	(0.2)	$ 0.4
Accounts receivable, reimbursement of leasehold improvements	$ 30.4			30.4	15.2
Book overdrafts	33.6			33.6	60.4
Accrued medical benefits and workers' compensation expense	7.2			7.2	6.9
Accrued automobile and general liability expense	1.2			$ 1.2	1.0
Cumulative effect adjustment for adoption of ASC, net of tax							$ (1.1)	$ 3.0
Term for access to auction				1 year
Total operating lease liabilities	778.1			$ 778.1
Operating lease right-of-use assets, net	$ 735.9			$ 735.9
Auction Sales
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Performance obligation satisfaction	1 year			1 year
Accounting Standards Update 2014-09 | Accumulated Deficit
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustment for adoption of ASC, net of tax								$ 3.0
Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustment for adoption of ASC, net of tax							(1.1)
Total operating lease liabilities							684.0
Operating lease right-of-use assets, net							$ 641.0
Reclassification Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reduction to cash and cash equivalents					11.7
Reduction to other accrued expenses					$ 11.7