Non-Controlling Interests - Outstanding Membership Interests in HoldCo (Details) - shares shares in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Amended Holdco LLC Agreement
Noncontrolling Interest [Line Items]
Beginning common stock, shares outstanding (in shares)	29,427	29,226
Stock based compensation transactions (in shares)	257	201
Exchange transactions (in shares)		0
Ending common stock, shares outstanding (in shares)	29,684	29,427
LLC Owners
Noncontrolling Interest [Line Items]
Beginning common stock, shares outstanding (in shares)	231	252
Stock based compensation transactions (in shares)	0	0
Exchange transactions (in shares)		(21)
Ending common stock, shares outstanding (in shares)	231	231
Ownership interest by continuing LLC owners	0.80%	0.80%	0.90%
PetIQ LLC Opco
Noncontrolling Interest [Line Items]
Beginning common stock, shares outstanding (in shares)	29,196	28,974
Stock based compensation transactions (in shares)	257	201
Exchange transactions (in shares)		21
Ending common stock, shares outstanding (in shares)	29,453	29,196
Ownership interest in Holdco	99.20%	99.20%	99.10%