Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Numerator:
Net (loss) income	$ (8,796)	$ 3,902	$ (552)	$ 5,343
Net (loss) income attributable to non-controlling interest	(2,906)	1,681	(88)	2,651
Net (loss) income attributable to PetIQ, Inc.	$ (5,890)	$ 2,221	$ (464)	$ 2,692
Denominator:
Basic weighted average shares (in shares)	22,974	16,944	22,387	15,842
Weighted-average shares of Class A common stock outstanding - diluted (in shares)	22,974	17,239	22,387	15,966
Basic net income per common share	$ (0.26)	$ 0.13	$ (0.02)	$ 0.17
Diluted net income per common share	$ (0.26)	$ 0.13	$ (0.02)	$ 0.17
Stock options
Denominator:
Dilutive effects of stocks		291,000		122,000
Anti dilutive shares excluded from computation of diluted earnings per share		974,000		974,000
RSU
Denominator:
Dilutive effects of stocks		4,000		1,000