CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) - USD ($) $ in Thousands		3 Months Ended
	Mar. 27, 2024	Mar. 31, 2025	Mar. 31, 2024	Mar. 29, 2024	Jan. 15, 2024
Equipment acquired and leasehold improvements		$ 62,500	$ 44,100
Contingent consideration to guarantee share value issued		1,100
Accounts payable, accrued expenses and other		368,000
Property and equipment, net		708,248
Goodwill		$ 717,480
Unsecured Debt
Debt instrument face value					$ 6,900
Heart & Lung Imaging Limited | Stock Holdback
Shares issued (in shares)	95,019
Equity interest issued, value assigned	$ 4,600
Tri Valley Imaging Group, LLC | Tri Valley Imaging Group, LLC
Goodwill				$ 6,500
Tri Valley Imaging Group, LLC | Fixed Maturities | Tri Valley Imaging Group, LLC
Property and equipment, net				$ 600
Ventura County Imaging Group, LLC
Additional noncontrolling interest issued in joint venture			12.50%
Accounts payable, accrued expenses and other			$ 5,100