Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2019	Nov. 08, 2019
Document and Entity Information
Document Type	10-Q
Document Quarterly Report	true
Document Transition Report	false
Document Period End Date	Sep. 30, 2019
Entity File Number	001-36677
Entity Registrant Name	DIPLOMAT PHARMACY, INC.
Entity Incorporation, State or Country Code	MI
Entity Tax Identification Number	38-2063100
Entity Address, Address Line One	4100 S. Saginaw Street
Entity Address, City or Town	Flint
Entity Address, State or Province	MI
Entity Address, Postal Zip Code	48507
City Area Code	888
Local Phone Number	720-4450
Title of 12(b) Security	Common Stock
Trading Symbol	DPLO
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		75,973,963
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q3
Entity Central Index Key	0001610092
Amendment Flag	false