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EARNINGS (LOSS) PER SHARE - Reconciliation of the Numerator and Denominator Used for Basic and Diluted Earnings (Loss) Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2017
Mar. 31, 2016
Numerator for basic earnings (loss) per share:        
Net income (loss) attributable to stockholders $ (80,601) $ 299,948 $ 389,976 $ 716,719
Numerator for diluted earnings (loss) per share:        
Net income (loss) attributable to stockholders (80,601) 299,948 389,976 716,719
Adjustment of redeemable limited partners' capital to redemption amount 100,506 (284,409) (296,566) (685,649)
Net income attributable to non-controlling interest in Premier LP 51,433 56,018 282,207 153,735
Net income (loss) 71,338 71,557 375,617 184,805
Tax effect on Premier, Inc. net income   (9,551) (61,303) (34,639)
Adjusted net income (loss) $ (80,601) $ 62,006 $ 314,314 $ 150,166
Denominator for basic earnings (loss) per share:        
Weighted average shares (in shares) 50,525 44,716 49,051 41,329
Denominator for diluted earnings (loss) per share:        
Weighted average shares (in shares) 50,525 44,716 49,051 41,329
Effect of dilutive securities:        
Weighted average shares and assumed conversions (in shares) 50,525 145,018 141,372 145,558
Basic earnings (loss) per share (in dollars per share) $ (1.60) $ 6.71 $ 7.95 $ 17.34
Diluted earnings (loss) per share (in dollars per share) $ (1.60) $ 0.43 $ 2.22 $ 1.03
Antidilutive securities excluded from computation of earnings per share (in shares) 2,800   1,800  
Class B common units exchangeable for Class A common shares | Limited Partner | Redeemable Limited Partners' Capital        
Effect of dilutive securities:        
Antidilutive securities excluded from computation of earnings per share (in shares) 88,900      
Common Stock | Class B Common Stock        
Effect of dilutive securities:        
Effect of dilutive securities (in shares) 0 97,837 91,875 102,057
Stock options        
Effect of dilutive securities:        
Effect of dilutive securities (in shares) 0 249 256 290
Antidilutive securities excluded from computation of earnings per share (in shares)   1,400   1,400
Restricted stock        
Effect of dilutive securities:        
Effect of dilutive securities (in shares) 0 610 190 553
Performance share awards        
Effect of dilutive securities:        
Effect of dilutive securities (in shares) 0 1,606 0 1,329
Antidilutive securities excluded from computation of earnings per share (in shares)     500