Acquisitions of Businesses, 2023 Acquisitions (Details) $ in Thousands							3 Months Ended	12 Months Ended
	Mar. 29, 2024 USD ($) Clinic	Oct. 31, 2023 USD ($)	Sep. 29, 2023 USD ($) Installment Clinic	Jul. 31, 2023 USD ($) Clinic	May 31, 2023 USD ($) Clinic	Feb. 28, 2023 USD ($) Clinic	Mar. 31, 2024 USD ($) Clinic	Dec. 31, 2023 USD ($) Clinic
Business Combination, Description [Abstract]
Number of clinics | Clinic							2	8
Contingent payments							$ 10,800	$ 12,500
IIP Business [Member]
Business Combination, Description [Abstract]
Percentage of interest acquired		100.00%
Deferred payments								0
Contingent payments								0
Cash paid, net of cash acquired								3,955
Seller note								0
Percentage of interest accrued		100.00%
Total consideration								3,955
Estimated fair value of net tangible assets acquired [Abstract]
Total current assets								388
Total non-current assets								335
Total liabilities								(41)
Net tangible assets acquired								682
Customer and referral relationships								757
Non-compete agreement								37
Tradenames								187
Goodwill								2,566
Fair value of non-controlling interest (classified as redeemable non-controlling interest)								(274)
Total consideration								$ 3,955
Ergonomics Software Business [Member]
Business Combination, Description [Abstract]
Percentage of interest acquired		55.00%
Percentage of pre-acquisition interest retained by practice founder		45.00%
Percentage of interest accrued		55.00%
IIP and Ergonomics Software Business [Member]
Business Combination, Description [Abstract]
Aggregate purchase price for the acquisition		$ 4,000
Acquisitions [Member]
Business Combination, Description [Abstract]
Number of clinics | Clinic								8
Deferred payments							0	$ 830
Contingent payments							500	200
Cash paid, net of cash acquired								26,582
Seller note							500	985
Total consideration							16,971	28,597
Estimated fair value of net tangible assets acquired [Abstract]
Total current assets							0	1,467
Total non-current assets							476	3,485
Total liabilities							(450)	(3,179)
Net tangible assets acquired							26	1,773
Customer and referral relationships							6,790	8,042
Non-compete agreement							328	396
Tradenames							1,672	1,767
Goodwill							25,056	27,726
Fair value of non-controlling interest (classified as redeemable non-controlling interest)							(16,901)	(11,107)
Total consideration							16,971	28,597
Acquisitions [Member] | Physical Therapy Operations [Member]
Business Combination, Description [Abstract]
Deferred payments								830
Contingent payments								200
Cash paid, net of cash acquired								22,627
Seller note								985
Total consideration								24,642
Estimated fair value of net tangible assets acquired [Abstract]
Total current assets								1,079
Total non-current assets								3,150
Total liabilities								(3,138)
Net tangible assets acquired								1,091
Customer and referral relationships								7,285
Non-compete agreement								359
Tradenames								1,580
Goodwill								25,160
Fair value of non-controlling interest (classified as redeemable non-controlling interest)								(10,833)
Total consideration								$ 24,642
Clinic Practice [Member]
Business Combination, Description [Abstract]
Percentage of interest acquired	50.00%			70.00%	75.00%	80.00%
Number of clinics | Clinic	9			5	4	1
Deferred payments				$ 300
Percentage of ownership interest after the acquisition					45.00%
Percentage of ownership interest by local partner after the acquisition					30.00%
Percentage of interest retained by practice founder	50.00%			30.00%		20.00%
Percentage of pre-acquisition interest retained by practice founder					25.00%
Aggregate purchase price for the acquisition	$ 16,400			$ 2,100	$ 3,100	$ 6,200
Cash paid by local partner					1,100
Seller note to be paid by entity					200
Seller note to be paid by local partner					100
Cash paid, net of cash acquired				$ 1,800	1,700	5,800	$ 500
Seller note					$ 300	$ 400
Percentage of interest accrued	4.50%					4.50%
September 2023 Multi Clinic Practice Acquisition [Member]
Business Combination, Description [Abstract]
Percentage of interest acquired			70.00%
Number of clinics | Clinic			4
Percentage of interest retained by practice founder			30.00%
Aggregate purchase price for the acquisition			$ 6,000
Cash paid, net of cash acquired			$ 5,400
Number of installments of payment of consideration due | Installment			2
Seller note			$ 600
Percentage of interest accrued			5.00%
September 2023 Multi Clinic Practice Acquisition [Member] | First Installment Due on January 31, 2024 [Member]
Business Combination, Description [Abstract]
Payment of principal and interest			$ 300
September 2023 Multi Clinic Practice Acquisition [Member] | Second Installment Due on September 30, 2025[Member]
Business Combination, Description [Abstract]
Payment of principal and interest			$ 300
September 2023 Single Clinic Practice Acquisition [Member]
Business Combination, Description [Abstract]
Percentage of interest acquired			70.00%
Number of clinics | Clinic			1
Deferred payments			$ 400
Percentage of interest retained by practice founder			30.00%
Aggregate purchase price for the acquisition			$ 7,800
Cash paid, net of cash acquired			$ 7,400