Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 28, 2024	Sep. 30, 2023
Operating activities:
Net income	$ 40,743	$ 87,731
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	87,393	80,582
Impairment losses	7,140	7,081
Change in deferred taxes	(761)	(2,690)
Loss on extinguishment of long-term debt, net	895	3,957
Loss on extinguishment of indebtedness to related party		472
Amortization of debt issuance costs	4,956	5,589
Equity-based compensation	22,316	13,873
Realized and unrealized gains from investments held in deferred compensation asset trusts	(3,285)	(1,001)
Gain on disposal of property and equipment	(1,505)	(642)
Changes in assets and liabilities, net of effects of acquisitions:
Accounts receivable	(12,936)	(10,028)
Prepaid expenses and other current assets	(15,809)	32,968
Other assets	(2,898)	(1,246)
Accounts payable and accrued liabilities	60,100	30,747
Leases	2,321	(8,455)
Deferred revenue	2,374	1,637
Other current liabilities	(19,549)	25,403
Other long-term liabilities	(14,759)	43,452
Related party payables	0	(1,666)
Cash provided by operating activities	156,736	307,764
Investing activities:
Purchases of property and equipment	(94,614)	(89,774)
Payments for acquisitions, net of cash acquired	(10,497)	(3,638)
Proceeds from the disposal of property and equipment	1,537	834
Investments in deferred compensation asset trusts	(6,767)	(5,402)
Proceeds from deferred compensation asset trust redemptions	1,639	1,438
Cash used in investing activities	(108,702)	(96,542)
Financing activities:
Distribution to KC Parent	(320,000)
Proceeds from issuance of long-term debt	264,338	1,258,750
Repayment of long-term debt		(1,310,881)
Repayment of indebtedness to related party		(56,328)
Principal payments of long-term debt	(7,933)	(2,943)
Payments of debt issuance costs	(230)	(7,320)
Repayments of promissory notes	(339)	(777)
Payments of financing lease obligations	(1,223)	(1,370)
Payments of deferred offering costs	(1,725)
Payments of contingent consideration for acquisitions		(6,917)
Cash used in financing activities	(67,112)	(127,786)
Net change in cash, cash equivalents, and restricted cash	(19,078)	83,436
Cash, cash equivalents, and restricted cash at beginning of period	156,412	105,469
Cash, cash equivalents, and restricted cash at end of period	137,334	188,905
Reconciliation of cash, cash equivalents, and restricted cash to the unaudited condensed consolidated balance sheets:
Cash and cash equivalents	137,240	188,641
Restricted cash included within other assets	94	264
Total cash, cash equivalents, and restricted cash at end of period	137,334	188,905
Supplemental cash flow information:
Cash paid for interest	75,750	102,634
Cash paid for income taxes, net of refunds	37,079	19,447
Cash paid for amounts included in the measurement of operating lease liabilities	217,564	213,297
Non-cash operating activities:
Operating lease right-of-use assets obtained in exchange for operating lease liabilities	143,824	41,977
Reclassification of equity-classified stock options and restricted stock units to liability-classified		6,750
Non-cash investing and financing activities:
Property and equipment additions included in accounts payable and accrued liabilities	8,537	5,780
Finance lease right-of-use assets obtained in exchange for finance lease liabilities	110	2,697
Reductions to finance lease right-of-use assets resulting from reductions to finance lease liabilities		512
Deferred offering costs included in accounts payable and accrued liabilities	$ 6,997
Measurement period and other adjustments to reduce contingent consideration payable		$ 32