Earnings (loss) per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								5 Months Ended	7 Months Ended	12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Jul. 20, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Numerator:
Net income (loss)									$ (3,344)	$ 11,161	$ 7,817	$ (3,395)	$ (1,349)
Less: net income attributable to non-controlling interests											(11,310)	$ 3,395	$ 1,349
Net income attributable to PetIQ, Inc.	$ (3,391)	$ 859	$ 6,070	$ 4,279	$ (1,177)	$ (2,512)	$ 598	$ (304)			$ (3,493)
Denominator:
Basic weighted average shares	13,222,583,000	13,222,583,000									13,222,583
Weighted Average Number of Shares Outstanding, Diluted, Total	13,222,583,000	13,222,583,000									13,222,583
Basic net income per common share	$ (0.25)	$ (0.02)									$ (0.26)
Diluted net income per common share	$ (0.25)	$ (0.02)									$ (0.26)