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ORGANIZATION AND BASIS OF PRESENTATION - Basis of Presentation (Narrative) (Details) - shares
9 Months Ended 12 Months Ended
Jan. 31, 2017
Oct. 31, 2016
Aug. 01, 2016
Mar. 31, 2017
Jun. 30, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]          
General partner interest (as a percent)       36.00% 32.00%
Limited partners ownership interest (as a percent)       64.00% 68.00%
Class B common shares          
Noncontrolling Interest [Line Items]          
Class B common units and associated Class B common shares exchanged (in shares) 1,296,682 5,047,528 1,323,654    
Shares retired (in shares)       7,700,000  
Exchanged for Class A common stock | Class B common units          
Noncontrolling Interest [Line Items]          
Class B common units and associated Class B common shares exchanged (in shares) 500,000 2,000,000   3,900,000  
Shares retired (in shares)       3,900,000  
Exchanged for cash | Class B common units          
Noncontrolling Interest [Line Items]          
Class B common units and associated Class B common shares exchanged (in shares) 800,000 3,000,000   3,800,000  
Shares retired (in shares)       3,800,000