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ORGANIZATION AND BASIS OF PRESENTATION - Schedule of Net Income Attributable to Premier LP (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Variable Interest Entity [Line Items]                      
Net income $ 100,636 $ 76,549 $ 19,769 $ 60,616 $ 73,860 $ 71,338 $ 246,184 $ 58,095 $ 257,570 $ 449,477 $ 235,161
Variable Interest Entity, Primary Beneficiary                      
Variable Interest Entity [Line Items]                      
Net income                 $ 371,131 $ 522,310 $ 275,955